4-8 Science Domain 2: Physical Science , Competencies 6-10 by Ratna Narayan

The teacher understands forces and motion and their relationships.

ratnarayan — 2022-10-22 17:43:55 UTC

The beginning teacher:

Demonstrates an understanding of properties of universal forces (e.g., gravitational, electrical, magnetic).
Understands how to measure, graph and describe changes in motion using concepts of displacement, speed, velocity and acceleration.
Understands the vector nature of force.
Identifies the forces acting on an object and applies Newton's laws to describe the motion of an object.
Analyzes the relationship between force and motion in a variety of situations (e.g., simple machines, blood flow, geologic processes).

The teacher understands physical properties of and changes in matter.

ratnarayan — 2022-10-22 17:45:10 UTC

The beginning teacher:

Describes the physical properties of substances (e.g., density, boiling point, melting point, solubility, thermal and electrical conductivity, luster, malleability).
Describes the physical properties and molecular structure of solids, liquids and gases.
Describes the relationship between the molecular structure of materials (e.g., metals, crystals, polymers) and their physical properties.
Relates the physical properties of an element to its placement in the periodic table, including metals, non-metals and metalloids.
Distinguishes between physical and chemical changes in matter.
Applies knowledge of physical properties of and changes in matter to processes and situations that occur in life and earth/space science.

The teacher understands chemical properties of and changes in matter.

ratnarayan — 2022-10-22 17:46:34 UTC

The beginning teacher:

Describes the structure and components of the atom.
Distinguishes among elements, compounds, mixtures and solutions and describes their properties.
Relates the chemical properties of an element to its placement in the periodic table.
Describes chemical bonds and chemical formulas.
Analyzes chemical reactions and their associated chemical equations.
Explains the importance of a variety of chemical reactions that occur in daily life (e.g., rusting, burning of fossil fuels, photosynthesis, cell respiration, chemical batteries, digestion of food).
Understands applications of chemical properties of matter in physical, life and earth/space science and technology (e.g., materials science, biochemistry, transportation, medicine, telecommunications).

The teacher understands energy and interactions between matter and energy.

ratnarayan — 2022-10-22 17:47:36 UTC

The beginning teacher:

Describes concepts of work, power and potential and kinetic energy.
Understands the concept of heat energy and the difference between heat and temperature.
Understands the principles of electricity and magnetism and their applications (e.g., electric circuits, motors, audio speakers, nerve impulses, lightning).
Applies knowledge of properties of light (e.g., reflection, refraction, dispersion) to describe the function of optical systems and phenomena (e.g., camera, microscope, rainbow, eye).
Demonstrates an understanding of the properties, production and transmission of sound.
Applies knowledge of properties and characteristics of waves (e.g., wavelength, frequency, interference) to describe a variety of waves (e.g., water, electromagnetic, sound).

The teacher understands energy transformations and the conservation of matter and energy.

ratnarayan — 2022-10-22 17:48:29 UTC

The beginning teacher:

Describes the processes that generate energy in the sun and other stars.
Applies the law of conservation of matter to analyze a variety of situations (e.g., the water cycle, food chains, decomposition, balancing chemical equations).
Describes sources of electrical energy and processes of energy transformation for human uses (e.g., fossil fuels, solar panels, hydroelectric plants).
Understands exothermic and endothermic chemical reactions and their applications (e.g., hot and cold packs, energy content of food).
Applies knowledge of the transfer of energy in a variety of situations (e.g., the production of heat, light, sound and magnetic effects by electrical energy; the process of photosynthesis; weather processes; food webs; food/energy pyramids).
Applies the law of conservation of energy to analyze a variety of physical phenomena (e.g., specific heat, nuclear reactions, efficiency of simple machines, collisions).
Understands applications of energy transformations and the conservation of matter and energy in life and earth/space science.

Sample qn from Pearson

2022-10-24 17:04:31 UTC

9. The tendency of an object to resist a change in its motion is known as

gravitational force.
inertia.
linear momentum.
velocity.

Answer is B

Sample qn from Pearson

2022-10-24 17:05:26 UTC

10. When a magnetic compass is brought near a wire carrying electric current, the compass needle is deflected from magnetic north. When the current is switched off, the needle points toward magnetic north. Which of the following best explains why this occurs?

Good electrical conductors are also permanent magnetics.
Moving electric charges produce magnetic fields.
The poles of a permanent magnet are regions of excess electric charge.
The magnetic field of the compass needle magnetizes the wire while the current is on.

Answer is B

Sample qn from Pearson

2022-10-24 17:06:24 UTC

11. Which of the following phase transitions involves the release of heat?

Evaporation of liquid water
Sublimation of ice
Melting of ice
Condensation of water vapor

Answer is D

Sample qn from Pearson

2022-10-24 17:07:02 UTC

12. Which of the following is the number of neutrons in an atom of chlorine-37 (mass number 37)?

Answer is D

Sample qn from Pearson

2022-10-24 17:07:43 UTC

13. Which of the following is best classified as a Brønsted-Lowry base?

Ca(OH)₂
C A open paren O H closed paren subscript 2
H₂SO₄
H subscript 2 S O subscript 4
NaCl
N A C L
CCl₄

Answer is A

Sample qn from Pearson

2022-10-24 17:09:01 UTC

14. In which of the following compounds is the bonding covalent?

KCl
K C l
MgBr₂
MgBr subscript 2
CH₄
C H subscript 4
Na₂O

Answer is C

Sample qn from Pearson

2022-10-24 17:10:39 UTC

15. Pitch is a characteristic of sound that is related to which of the following properties of a sound wave?

Speed
Frequency
Intensity
Amplitude

Answer is B

Sample qn from Pearson

2022-10-24 17:11:30 UTC

16. Which of the following energy transformations occurs in an alkaline battery while a flashlight is operating?

Mechanical energy to chemical energy
Electrical energy to mechanical energy
Chemical energy to electrical energy
Chemical energy to mechanical energy

Answer is C

Sample qn from Pearson

2022-10-24 17:12:46 UTC

17. If the chemical equation above is balanced using the smallest possible whole-number coefficients, the coefficient for NO₂(g) would be which of the following?

Answer is B

Question 2 Answer J

2023-01-18 15:23:57 UTC

A balance and a graduated cylinder are used to determine the density of a mineral sample. The sample has a mass of 14.7 g and a volume of 2.2 cm3. What is the density of the mineral sample?
F 0.15 g/cm3
G 32 g/cm3
H 13 g/cm3

J 6.7 g/cm3

Question 3 Answer C

2023-01-18 15:25:54 UTC

The three vehicles shown below are all traveling at a speed of 15 m/s, but only the pickup truck has a changing velocity.The pickup truck has a changing velocity because the pickup truck —

A can accelerate faster than the other two vehicles

B is traveling in the opposite direction from the other two vehicles

C is traveling on a curve in the road

D needs a large amount of force to move

Question 5 Answer C

2023-01-18 15:37:37 UTC

A researcher wants to experiment with an element that reacts like phosphorus (P) but has a greater atomic mass. Which element should the researcher select for the experiment?

A Nitrogen (N)

B Sulfur (S)

C Arsenic (As)

D Silicon (Si)

question 7 Answer D

2023-01-18 15:38:21 UTC

Two boxes and their masses are shown below. Which of the following situations shows work being done?

A A student is sitting in a chair and holding both boxes.

B A student is holding the large box 1 m above the floor.

C A student is standing and holding the small box.

D A student is lifting the small box 0.5 m from the floor to a table.

question 10 Answer H

2023-01-18 15:42:04 UTC

For an investigation, a student measures the speed of a cart as it rolls down a ramp. The student then records data in the table below.Which of these best explains the student’s data?

F The speed of the cart decreases as the cart rolls down the ramp because of friction between the cart and the ramp.

G The speed of the cart increases as the cart rolls down the ramp because the force acting on the cart is greater than the force of gravity.

H The speed of the cart increases as the cart rolls down the ramp because the forces acting on the cart are unbalanced.

J The speed of the cart decreases as the cart rolls down the ramp because the forces acting on the cart are balanced.

question 11 Answer A

2023-01-18 15:44:01 UTC

A model of an atom is shown below.An atom of which element is represented by this model?

A Boron (B)

B Carbon (C)

C Neon (Ne)

D Sodium (Na)

question 14 Answer F

2023-01-18 15:44:26 UTC

Two cars with different masses travel at the same speed down a hill toward a stop sign. What will happen when both cars apply brakes at the same time to stop?

F The car with the smaller mass will require less force to stop than the car with the larger mass.

G The car with the larger mass will maintain its velocity while traveling down the hill.

H The car with the smaller mass will take longer to stop than the car with the larger mass.

J The car with the larger mass will have less inertia than the car with the smaller mass.

question 15 Answer B

2023-01-18 15:48:57 UTC

Which of the following best describes an electron?

A It has no charge and about the same mass as a proton.

B It has a negative charge and much less mass than a proton.

C It has a positive charge and much more mass than a neutron.

D It has a negative charge and about the same mass as a neutron.

question 18 Answer F

2023-01-18 15:54:58 UTC

A scientist spilled a few drops of dilute hydrochloric acid (HCl) on a lab table. For safety purposes, the scientist sprinkled some baking soda (NaHCO3) onto the spill. Which observation would provide the best evidence that a chemical reaction occurred?

F The baking soda and hydrochloric acid combined, and bubbles formed.

G The baking soda absorbed the hydrochloric acid.

H Some of the baking soda dissolved in the hydrochloric acid.

J The hydrochloric acid evaporated, leaving only the baking soda.

question 19 Answer B

2023-01-18 16:00:28 UTC

In the classroom demonstration shown below, a rubber ball is dropped from Position 1. The ball bounces as shown.At which of these positions does the ball have both the greatest kinetic energy and the least potential energy?

A Position 1

B Position 2

C Position 3

D Position 4

question 20 Answer J

2023-01-18 16:02:37 UTC

Which information could a student determine from only the chemical formula of a protein?

F The color of the protein

G The number of molecules in each sequence that makes up a protein

H The physical arrangement of atoms in the structure of the protein

J The number of atoms of each element in the protein?

question 22 Answer J

2023-01-18 16:06:30 UTC

Four students raced toy cars on a track. The mass and the acceleration of each car is recorded in the table below.Which toy car had the greatest applied force?

F1
G2
H3
J4

question 23 Answer D

2023-01-18 16:08:58 UTC

A teacher asks a student to write the chemical equation for photosynthesis. The student’s response is shown below.

CO2 + H2O light C6H12O6 + O2
The equation is not balanced correctly. Which of these is a balanced equation for

photosynthesis?
A 12CO2 + H2O light C6H12O6 + O2

B CO2 + 9H2O light C6H12O6 + O2
C CO2 + H2O light 3C6H12O6 + O2
D 6CO2 + 6H2O light C6H12O6 + 6O2

question 28 Answer F

2023-01-25 16:07:41 UTC

A car travels at a constant speed of 15 m/s for 2 minutes. The car increases its speed from 15 to 25 m/s during the next minute and then travels at a constant speed of 25 m/s for
2 more minutes. Which of the following graphs best represents the car’s motion during this 5-minute period?

question 30 Answer 4

2023-01-25 16:08:13 UTC

A student walks 2 km in 30 minutes. What is the student’s average speed in km/h? Record your answer and fill in the bubbles on your answer document. Be sure to use the

correct place value.

question 31 Answer C

2023-01-25 16:11:13 UTC

Hay is made up of organic compounds. What are the main elements in many organic compounds?

A Helium, carbon, sodium

B Sodium, hydrogen, nitrogen

C Carbon, hydrogen, oxygen

D Radon, oxygen, helium

question 33 Answer D

2023-01-25 16:12:20 UTC

When trying to identify an unknown element, a scientist determines what other elements the unknown element reacts with chemically. Which property of the unknown element determines the other elements it reacts with?

A The total number of neutrons in the unknown element

B The total number of particles in the nucleus of the unknown element

C The number of protons in the nucleus of the unknown element

D The number of valence electrons in the unknown element

question 37 Answer C

2023-01-25 16:14:59 UTC

The model of the periodic table below shows the locations of four elements.A student is asked to identify an element that is a pale-yellow brittle solid and does not conduct electricity. At which location in this periodic table would the element most likely be found?

A1
B2
C3
D4

question 40 Answer F

2023-01-25 16:15:39 UTC

An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the atom’s nucleus?

F +25
G +30
H −25
J −30

question 36 Answer F

2023-01-25 16:20:11 UTC

Some students measure the acceleration of a wheeled cart being acted on by varying forces. The students record their data in the table shown above. According to the data table, how much force is acting on the cart when the students measure an acceleration of 2.6 m/s2?

F 13N
G7N
H8N
J 12N

question 39 Answer D

2023-01-25 16:21:00 UTC

The diagram below shows a hot air balloon rising. Propane gas tanks are seen at the bottom of the balloon.

What energy transformations occur when propane gas is used to lift the balloon?

A Mechanical light chemical

B Chemical mechanical thermal

C Thermal chemical light

D Chemical thermal mechanical

Question 3 Answer B

salasceciliacruz — 2024-05-28 00:49:58 UTC

For a laboratory investigation some students put a strip of shiny metal into a beaker of blue solution and then stored the beaker on a shelf overnight. The next morning, the students recorded observations about the metal and the solution in the box below. Based on their observations, can the students correctly conclude that a chemical reaction occurred?

A No, because the metal strip was still visible

B Yes, because a new material of a different color formed on part of the metal strip

C No, because the solution stayed blue

D Yes, because the volume of the blue solution stayed the same

Question 4 Answer F

salasceciliacruz — 2024-05-28 00:52:55 UTC

Which statement describes the energy changes that occur when water in a tea kettle is heated on a stove that uses natural gas?

F Some of the chemical energy in the natural gas transforms into thermal energy, which heats the water. Then some of the thermal energy changes into sound energy when the water forms steam and the steam leaves the kettle.

G Some of the thermal energy in the natural gas transforms into sound energy when the water becomes hot. Then some of the sound energy changes into light energy when the kettle becomes warm.

H Some of the electrical energy in the natural gas transforms into thermal energy, which causes the water to form steam. Then some of the thermal energy changes into sound energy and light energy when the steam leaves the kettle. J Some of the light energy in the natural gas transforms into chemical energy in the water. Then some of the chemical energy changes into kinetic energy when steam leaves the kettle and into sound energy when the water boils.

Question 6 Answer G

salasceciliacruz — 2024-05-28 01:00:50 UTC

A 1,100 kg car comes uniformly to a stop. If the vehicle is accelerating at -1.2 m/s² , which force is closest to the net force acting on the vehicle?

F -9,600 N

G -1,300 N

H -900 N

J -94 N

Question 9 Answer A

salasceciliacruz — 2024-05-28 01:06:35 UTC

The diagram of Situation 1 shows one person failing to move a refrigerator up a ramp, while the diagram of Situation 2 shows two people successfully pushing a refrigerator up a ramp. What comparison can be made about the work done in the two situations?

A In Situation 1, no work was done, while 12,000 J of work was done in Situation 2.

B In Situation 1, 1,600 J of work was done, while 3,000 J of work was done in Situation 2.

C In Situation 1, no work was done, while 8,000 J of work was done in Situation 2.

D In Situation 1, 400 J of work was done, while 1,300 J of work was done in Situation 2.

Question 11 Answer 5

salasceciliacruz — 2024-05-28 01:09:20 UTC

How many valence electrons are in an atom of each element in Group 15 in the periodic table?

Record your answer and fill in the bubbles on your answer document. Be sure to use the correct place value.

Question 14 Answer F

salasceciliacruz — 2024-05-28 01:15:51 UTC

The picture shows an aerialist walking on a tightrope and holding a balancing bar. An action–reaction pair of forces exists between —

F the aerialist’s feet and the rope

G the rope and the balancing bar

H the two ends of the rope

J the aerialist’s arms and legs

Question 15 Answer A

salasceciliacruz — 2024-05-28 01:19:31 UTC

A student drew atomic models of four elements. Based on these drawings, which element is the least reactive?

A Neon, because it has two energy levels with eight electrons in the second level

B Chlorine, because it has three energy levels with seven electrons in the third level

C Gallium, because it has four energy levels with three electrons in the fourth level

D Tin, because it has five energy levels with four electrons in the fifth level

Question 18 Answer J

salasceciliacruz — 2024-05-28 01:26:35 UTC

Which statement accurately describes the atoms of a specific element?

F An indium‚ In‚ atom contains 115 protons inside the nucleus and 49 neutrons outside the nucleus.

G A scandium‚ Sc‚ atom contains 45 electrons outside the nucleus and 21 neutrons inside the nucleus.

H An aluminum‚ Al‚ atom contains 27 electrons and 27 protons inside the nucleus.

J A zinc‚ Zn‚ atom contains 30 protons inside the nucleus and 30 electrons outside the nucleus.

Question 20 Answer G

salasceciliacruz — 2024-05-28 01:29:57 UTC

Which statement does NOT correctly compare silicon with another element?

F Silicon is a better conductor of electricity than sulfur.

G Silicon conducts electricity as well as copper does.

H Silicon is a solid at room temperature, but argon is a gas.

J Silicon is less malleable than silver.

Question 21 Answer C

salasceciliacruz — 2024-05-28 01:31:33 UTC

A marble is given potential energy by being placed at Location W. When the marble is released, it rolls down the track. At which location does the marble have maximum kinetic energy?

A Location W

B Location X

C Location Y

D Location Z

Question 22 Answer J

salasceciliacruz — 2024-05-28 01:36:33 UTC

Which chemical reaction involves the fewest oxygen atoms?

F 2AgNO₃ + K₂SO₄ ---> Ag₂SO₄ + 2KNO₃

G 4Fe + 6H₂O +3O₂ ---> 4Fe(OH)₃

H 6CO₂ +6H₂O ---> C₆H₁₂O₆ + 6O₂

J C₂H₄+ 3O₂ ---> 2CO₂ + 2H₂O

Question 25 Answer A

salasceciliacruz — 2024-05-28 01:42:38 UTC

Sulfur hexafluoride, SF6, is a very stable, nonflammable gas at room temperature. It is used in many electronic products because it is a good electrical insulator. Which statement describes the composition of sulfur hexafluoride?

A SF₆ is a compound containing atoms of sulfur and fluorine.

B SF₆ is a compound that contains seven identical atoms.

C SF₆is an element with sulfur in the atom’s nucleus and fluorine outside the nucleus.

D SF₆ is an organic compound composed of long chains of sulfur atoms surrounded by fluorine atoms.

Question 26 Answer F

salasceciliacruz — 2024-05-28 01:43:34 UTC

Four boxes are sliding with constant speed before each box experiences an unbalanced force of 8 N. Which box would experience the greatest acceleration when the unbalanced force is applied?

F The box with a mass of 2 kg

G The box with a mass of 4 kg

H The box with a mass of 6 kg

J The box with a mass of 8 kg

Question 28 Answer J

salasceciliacruz — 2024-06-10 18:36:35 UTC

As part of an investigation, students combined substances in a beaker to observe chemical reactions. They performed two procedures. They measured the mass of each substance before and after each reaction. The table shows their observations. Assuming the students did not make any careless errors, what likely explains these changes in mass?

F Procedure 1: All the reactants were liquids that evaporated. Procedure 2: A gas was formed as one product, and it escaped into the air.

G Procedure 1: One of the reactants was converted to thermal energy. Procedure 2: All the products were liquids.

H Procedure 1: The reactants were liquids with different densities. Procedure 2: The reactants were combined into only one product.

J Procedure 1: One of the products was a gas that escaped into the air. Procedure 2: A gas from the air reacted with one of the other reactants.

Question 31 Answer B

salasceciliacruz — 2024-06-10 18:48:42 UTC

Four students were asked to complete a table for a science assignment. Each student selected one chemical element from each of four groups in the periodic table and then classified each element as a metal, a nonmetal, or a metalloid.

Which table was completed correctly?

Question 32 Answer 0.36

salasceciliacruz — 2024-06-10 18:52:19 UTC

A block is pulled 0.90 m to the right in 2.5 s. What is the block’s average speed to the nearest hundredth of a m/s? Record your answer and fill in the bubbles on your answer document. Be sure to use the correct place value.

Question 37 Answer B

salasceciliacruz — 2024-06-10 19:02:02 UTC

A physics teacher performed a demonstration for a science class by pulling a crate across the floor and measuring the force with a spring scale. While she pulled, a student measured the acceleration of the crate with a handheld electronic device. The results of three trials are shown below.

The teacher asked the class to calculate the acceleration of the crate based on the crate’s mass and the force she applied. What conclusion can be made about the difference between the calculated acceleration and the actual acceleration that occurred in the trials?

A Another force in the direction of the motion produced a lower acceleration than calculated.

B An opposing force caused by friction produced a lower acceleration than calculated.

C Another force in the direction of the motion produced a higher acceleration than calculated.

D An opposing force caused by friction produced a higher acceleration than calculated.

Question 40 Answer J

salasceciliacruz — 2024-06-10 19:06:02 UTC

Students slid a small wood block along a flat tabletop for a distance of 1.6 m. The data show the motion of the block of wood. Which graph displays the motion of the wood block?

Question 44 Answer 6

salasceciliacruz — 2024-06-10 19:32:48 UTC

How many atoms of oxygen are in a molecule of glucose (C₆H₁₂O₆ )? Record your answer and fill in the bubbles on your answer document. Be sure to use the correct place value.

Question 48 Answer J

salasceciliacruz — 2024-06-10 19:37:57 UTC

The chemical equation shown below represents a reaction that produces fuel for certain cars.

CO + H₂O --->CO₂ + H₂

Which substance represented in this equation is classified as an element?

F CO

G H₂O

H CO₂

J H₂

Question 52 Answer G

salasceciliacruz — 2024-06-10 19:45:02 UTC

During an investigation, a student combined the two clear, colorless solutions shown below. The student observed that the temperature changed from 25°C to 23°C when the solutions were combined and that a white substance rapidly formed and settled to the bottom of the container. What most likely happened to produce these results?

F One of the original compounds came out of solution.

G The solutions reacted chemically.

H Some of the water froze into ice crystals.

J Rapid evaporation of water occurred, leaving a solid.

Question 54 Answer F

salasceciliacruz — 2024-06-10 19:50:20 UTC

The diagram below shows a boat moving north in a river at 3 m/s while the current in the river moves south at 1 m/s. How will the boat be affected if it enters a part of the river where the current is moving south at 2 m/s?

F The boat will move slower.

G The boat will move faster.

H The boat will stop.

J The boat will move to the west.

2014 STAAR Question 1 Answer A

salasceciliacruz — 2024-06-11 16:36:01 UTC

A student lets a toy car roll four times down a ramp that is 1 m long. Each time the student covers the surface of the ramp with a different material. The student measures the time it takes the car to roll down the ramp and records the results in the table below.

Which of these would be the best conclusion based on the data in the table? A Different surfaces affect how fast a toy car accelerates.

B Different toy cars travel at different speeds.

C Gravity has little effect on the speed of toy cars on different surfaces.

D Air resistance is the greatest factor in limiting the acceleration of different toy cars.

2014 STAAR Question 4 Answer J

salasceciliacruz — 2024-06-11 16:41:16 UTC

Four students were asked to classify the activities of the people in the picture below as examples of either potential or kinetic energy. Which student correctly classified the activities?

2014 STAAR Question 6 Answer J

salasceciliacruz — 2024-06-11 16:45:48 UTC

Many processes occur in the digestive system. Which process is best classified as a physical change?

F Saliva converting the starch molecules in crackers into simple sugars

G Digestive enzymes breaking down proteins into smaller fragments

H Bacteria converting lactose into simple sugars in the intestines

J Teeth grinding an almond into smaller pieces in the mouth

2014 STAAR Question 10 Answer G

salasceciliacruz — 2024-06-11 16:52:48 UTC

Some students in a chemistry lab conducted an investigation in which they added four different solid substances to separate beakers of water. They stirred the mixtures for one minute and then recorded their observations in the table below.

Which substance most likely caused a new substance to be formed when mixed with water?

F Substance 1

G Substance 2

H Substance 3

J Substance 4

2014 STAAR Question 16 Answer J

salasceciliacruz — 2024-06-11 17:04:20 UTC

A student is studying calcium, a highly reactive element that humans need for strong bones. Which characteristic of calcium is most closely related to its chemical reactivity?

F The 20 protons in each atom of calcium

G The density of calcium, which is 1 5. g 4 /cm³

H The atomic mass of calcium, which is 40.078 amu

J The 2 valence electrons in each atom of calcium

2014 STAAR Question 17 Answer 1740

salasceciliacruz — 2024-06-11 17:05:36 UTC

When a space shuttle was launched, the astronauts onboard experienced an acceleration of 29.0 m/s2 . If one of the astronauts had a mass of 60.0 kg, what net force in newtons did the astronaut experience?

Record your answer and fill in the bubbles on your answer document. Be sure to use the correct place value.

2014 STAAR Question 19 Answer B

salasceciliacruz — 2024-06-11 17:09:43 UTC

A model of a beryllium atom is shown below.

What types of particles are found in the cloud surrounding the atom’s nucleus?

A Positively charged particles and negatively charged particles

B Negatively charged particles only

C Neutral particles and positively charged particles

D Positively charged particles only

2014 STAAR Question 21 Answer A

salasceciliacruz — 2024-06-11 17:12:58 UTC

Based on its chemical formula, which of the following substances is an organic compound?

A Urea, CH₄N₂O

B Ammonium sulfide, (NH₄)₂S

C Silane, SiH₄

D Sodium chloride, NaCl

2014 STAAR Question 23 Answer B

salasceciliacruz — 2024-06-11 17:17:27 UTC

The graph below shows distance over time.

Which of these situations could be represented by this graph?

A A student walks 1.5 km to a friend’s house in 40 minutes. The two students then walk another 1.5 km to school in 20 minutes.

B A student walks 1.5 km to a friend’s house in 20 minutes. The two students then walk another 1.5 km to school in 40 minutes.

C A student walks 1.5 km to a friend’s house in 30 minutes. The two students then walk another 1.5 km to school in 30 minutes.

D A student walks 1.5 km to a friend’s house in 20 minutes. The two students then walk another 1.5 km to school in 60 minutes.

2014 STAAR Question 25 Answer C

salasceciliacruz — 2024-06-11 17:20:49 UTC

CaCO₃ -heat-->CaO + CO₂

In the chemical reaction shown above, the products are best classified as —

A two elements

B one element and one compound

C two compounds

D two compounds and one element

2014 STAAR Question 27 Answer A

salasceciliacruz — 2024-06-11 17:23:11 UTC

A student uses a magnet to move a 0.025 kg metal ball. The magnet exerts a force of 5 N, which causes the ball to begin moving. What is the acceleration of the ball when it begins to move?

A 200 m/s²

B 0.125 m/s²

C 5 m/s²

D 5.025 m/s²

2014 STAAR Question 31 Answer A

salasceciliacruz — 2024-06-11 17:26:39 UTC

The chemical formula for sodium sulfate is Na₂SO₄ . How many sulfur atoms are in the formula for sodium sulfate?

A 1

B 2

C 6

D 7

2014 STAAR Question 33 Answer D

salasceciliacruz — 2024-06-11 17:29:46 UTC

What is the mass number of a potassium (K) atom that has 20 neutrons?

A 18

B 19

C 20

D 39

2014 STAAR Question 34 Answer G

salasceciliacruz — 2024-06-11 17:30:41 UTC

What is the difference between the velocity and the speed of an object?

F Velocity is the change in distance over time, while speed is the change in velocity over time.

G Velocity has a direction associated with it, while speed has no specific direction.

H Velocity has no direction associated with it, while speed has a specific direction.

J Velocity is the change in speed over time, while speed is the change in distance over time.

2014 STAAR Question 38 Answer 1.4

salasceciliacruz — 2024-06-11 17:35:41 UTC

Some students were investigating the speed of a toy car they built. They performed two trials and recorded their data in the table below.

What was the average speed of the toy car during the two trials to the nearest tenth of a m/s?

Record your answer and fill in the bubbles on your answer document. Be sure to use the correct place value.

2014 STAAR Question 39 Answer C

salasceciliacruz — 2024-06-11 17:36:50 UTC

A scientist performed four investigations using eight different liquids. In each investigation, the scientist combined two of the liquids under a fume hood and recorded observations in the table below.

In which investigation is it least likely that the liquids reacted chemically?

A 1

B 2

C 3

D 4

2014 STAAR Question 41 Answer C

salasceciliacruz — 2024-06-11 17:41:19 UTC

The diagram below shows a sled moving along a smooth, frictionless track.

In which sections of the track will the sled experience an unbalanced force?

A Sections 1 and 3

B Sections 2 and 3

C Sections 2 and 4

D Sections 3 and 4

2014 STAAR Question 43 Answer B

salasceciliacruz — 2024-06-11 17:43:20 UTC

The masses of four vehicles and the net forces acting on them as they enter a highway are recorded in the table below.

Which vehicle has the greatest acceleration as it enters the highway?

A Sedan

B Coupe

C SUV

D Truck

2014 STAAR Question 44 Answer 25

salasceciliacruz — 2024-06-11 17:44:19 UTC

Serotonin is a chemical substance that acts as a neurotransmitter. It helps relay messages in the human brain. The formula for one molecule of serotonin is shown below.

C₁₀H₁₂N₂O

How many atoms in all are in a molecule of serotonin?

Record your answer and fill in the bubbles on your answer document. Be sure to use the correct place value.

2014 STAAR Question 46 Answer G

salasceciliacruz — 2024-06-11 17:47:00 UTC

A student is studying the ways different elements are similar to one another. Diagrams of atoms from four different elements are shown below.

Which two atoms are of elements in the same group in the periodic table?

F Atom 1 and Atom 2

G Atom 1 and Atom 4

H Atom 2 and Atom 3

J Atom 3 and Atom 4

2014 STAAR Question 48 Answer F

salasceciliacruz — 2024-06-11 17:48:58 UTC

Some students conducted a laboratory investigation to learn more about the physical properties of different elements. They observed four samples and recorded their observations in the table below.

Based on these observations, which sample is most likely a nonmetal?

F Sample 1

G Sample 2

H Sample 3

J Sample 4

2014 STAAR Question 51 Answer C

salasceciliacruz — 2024-06-11 17:53:56 UTC

The table below lists three characteristics of an atom of an element.

An atom of which element is described by the data in the table?

A Radon (Rn)

B Cadmium (Cd)

C Rubidium (Rb)

D Astatine (At)

2014 STAAR Question 54 Answer H

salasceciliacruz — 2024-06-11 17:57:24 UTC

The diagram shows a homemade car being pushed with a force of 25 N.

The force causes the car to move at a constant speed of 3 m/s. What will happen if the force is changed to 35 N?

F The car will move at a constant speed of 13 m/s.

G The speed of the car will not change.

H The speed of the car will increase.

J The speed of the car will decrease to 1 m/s.

2015 STAAR Question 5 Answer D

salasceciliacruz — 2024-06-12 18:15:04 UTC

An athlete is trying to lift some weights. He successfully lifts 200 N weights, but when he tries to lift 400 N weights, he is unsuccessful.

Which of these correctly compares the amount of work the athlete does on the weights?

A The athlete does no work on either the 200 N weights or the 400 N weights.

B The athlete does no work on the 200 N weights but does work on the 400 N weights.

C The athlete does work on both the 200 N weights and the 400 N weights.

D The athlete does work on the 200 N weights but does no work on the 400 N weights.

2015 STAAR Question 9 Answer C

salasceciliacruz — 2024-06-12 18:21:42 UTC

Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?

A The shape of the coal changes.

B Oxygen is present.

C A new substance is produced.

D Coal is made up of more than one element.

2015 STAAR Question 11 Answer A

salasceciliacruz — 2024-06-12 18:24:01 UTC

The atoms of a certain element each contain 11 protons and 1 valence electron. Which statement correctly identifies this element and describes its chemical reactivity?

A The element is sodium, and it is highly reactive.

B The element is fluorine, and it is not very reactive.

C The element is sodium, and it is not very reactive.

D The element is fluorine, and it is highly reactive.

2015 STAAR Question 12 Answer H

salasceciliacruz — 2024-06-12 18:24:43 UTC

A bus travels 20 km in 30 minutes. What is the average speed of the bus?

F 20 km/h

G 30 km/h

H 40 km/h

J 50 km/h

2015 STAAR Question 14 Answer F

salasceciliacruz — 2024-06-12 18:27:35 UTC

During a demonstration of Newton’s laws of motion, a student used the setup shown in Figure 1. The student flicked the index card with a fingertip, and the coin fell straight down into a plastic cup as shown in Figure 2.

Which of these best explains why the coin fell straight down into the cup instead of remaining on the index card?

F The coin was at rest until the card was removed, so it tended to remain in the same location. Once the card was gone, the unbalanced force of gravity caused the coin to fall.

G Moving the card applied an action force on the coin. Since the card was gone, gravity applied a reaction force on the coin.

H The card had less mass than the coin, so a smaller force of gravity acted on the card. The larger force of gravity on the coin made it fall.

J The acceleration of the coin falling into the cup was equal and opposite to the acceleration of the card.

2015 STAAR Question 15 Answer B

salasceciliacruz — 2024-06-12 18:30:10 UTC

For an investigation a student records data about four unknown substances.

The student then calculates the densities of the unknown substances and compares them with the table of densities of known substances shown below.

Which unknown substance is most likely carbon?

A Substance 1

B Substance 2

C Substance 3

D Substance 4

2015 STAAR Question 17 Answer 48

salasceciliacruz — 2024-06-12 18:36:51 UTC

An atom of a certain element has 36 protons, 36 electrons, and a mass number of 84. At room temperature this element is a very stable gas. How many neutrons are in this atom?

Record your answer and fill in the bubbles on your answer document. Be sure to use the correct place value.

2015 STAAR Question 19 Answer A

salasceciliacruz — 2024-06-12 18:39:16 UTC

Four students push carts filled with sports equipment across the gym. Each student pushes with the same amount of force. Which cart has the greatest change in speed?

2015 STAAR Question 22 Answer H

salasceciliacruz — 2024-06-12 18:45:33 UTC

All the following reactions are correctly balanced except —

F 2C₂H₂+ 5O₂ ---> 4CO₂ + 2H₂O

G 4Fe + 3O₂---> 2Fe₂O₃

H NaHCO₃ ---> Na₂CO₃ + H₂O + CO₂

J 2CH₃OH + 3O₂ ---> 2CO₂ + 4H₂O

2015 STAAR Question 24 Answer G

salasceciliacruz — 2024-06-12 18:50:29 UTC

The periodic table is organized into groups and periods of elements. The characteristics of a certain group of elements are listed below.

Which of these elements is in this group?

F Lithium

G Strontium

H Aluminum

J Silicon

2015 STAAR Question 25 Answer A

salasceciliacruz — 2024-06-12 18:51:39 UTC

A student drew the diagram below to show the movement of water through a hydroelectric dam.

The student used the diagram to describe changes in the potential and kinetic energy of the water. At which location is the gravitational potential energy of the water the greatest?

A Location W

B Location X

C Location Y

D Location Z

2015 STAAR Question 27 Answer D

salasceciliacruz — 2024-06-12 18:55:30 UTC

Which of these formulas contain equal numbers of nitrogen atoms?

A Formulas I and III

B Formulas I and IV

C Formulas II and III

D Formulas I, II, and V

2015 STAAR Question 29 Answer A

salasceciliacruz — 2024-06-12 18:57:39 UTC

Quasars are extremely distant celestial bodies. Investigators using a special telescope determined that a certain quasar was emitting waves with a frequency of 1 4. 1 × 109 Hz. An electromagnetic spectrum is shown.

The investigators were most likely using a telescope that detects —

A microwaves

B visible light

C x-rays

D gamma rays

2015 STAAR Question 30 Answer 18

salasceciliacruz — 2024-06-12 18:58:17 UTC

A basketball with a mass of 0.60 kg is accelerated with a force of 10.8 N. If resisting forces are ignored, what is the acceleration of the basketball to the nearest m/s2?

Record your answer and fill in the bubbles on your answer document. Be sure to use the correct place value.

2015 STAAR Question 33 Answer C

salasceciliacruz — 2024-06-12 19:01:26 UTC

Aluminum, sulfur, and chlorine are elements found on the periodic table. Tests involving these three elements would show that at normal room temperature —

A sulfur is malleable and aluminum conducts electricity

B chlorine is malleable and conducts electricity

C aluminum is malleable and conducts electricity

D all three elements are malleable and conduct electricity

2015 STAAR Question 35 Answer B

salasceciliacruz — 2024-06-12 19:05:17 UTC

The diagram below shows two different forces acting on a cyclist riding a bicycle.

The total mass of the cyclist and the bicycle is 100.0 kg. Based on this information, what is the acceleration of the cyclist?

A 0 6. m6 /s² backward, because the force of the air slows the cyclist down

B 0 6. m6 /s² forward, because the applied force is greater than the force of the air

C 2 3. m/s² backward, because the forces are opposite and not equal

D 2 3. m/s² forward, because the cyclist’s inertia is greater than the force of the air

2015 STAAR Question 36 Answer J

salasceciliacruz — 2024-06-12 19:06:57 UTC

The equation below represents a chemical reaction that occurs in living cells.

C₆H₁₂O₆ + 6O₂ ---> 6CO₂ + 6H₂O + energy

How many atoms are represented in the reactants of this equation?

F 6

G 12

H 24

J 36

2015 STAAR Question 37 Answer C

salasceciliacruz — 2024-06-12 19:07:36 UTC

Which of the following best describes the velocity of an object?

A 30 m/s

B 30 m east

C 30 m/s east

D 30 m/s²

2015 STAAR Question 39 Answer A

salasceciliacruz — 2024-06-12 19:09:03 UTC

A chemist is identifying the elements present in a sample of seawater. What characteristic of an element’s atoms always determines the element’s identity?

A The number of protons

B The number of neutrons

C The location of valence electrons

D The number of valence electrons

2015 STAAR Question 43 Answer C

salasceciliacruz — 2024-06-12 19:18:35 UTC

A student jumps off a sled toward the west after it stops at the bottom of an icy hill.

Based on the law of action–reaction, in what direction will the sled most likely move as the student jumps off?

A North

B South

C East

D West

2015 STAAR Question 45 Answer B

salasceciliacruz — 2024-06-12 19:20:26 UTC

In the early 1900s many scientists thought that an atom consisted of a positive substance with negative charges scattered throughout the substance. Then Ernest Rutherford completed an experiment that changed the concept of an atom. His discovery led to the understanding that an atom consists mostly of empty space with — A protons orbiting a dense nucleus made of electrons and neutrons

B electrons orbiting a dense nucleus made of protons and neutrons

C neutrons and protons orbiting a cloud of electrons

D electrons and protons orbiting a cloud of neutrons

2015 STAAR Question 48 Answer F

salasceciliacruz — 2024-06-12 19:24:18 UTC

For an investigation a student poured a blue solution of CuSO₄ into a beaker. The student placed a shiny, silver-colored strip of zinc metal in the solution and observed the changes.

The student inferred that a chemical reaction occurred. What evidence supports this inference?

F A dark solid formed on the zinc metal.

G The zinc metal remained silver-colored and shiny.

H The CuSO₄ solution turned blue when the zinc metal was added.

J None of these

2015 STAAR Question 49 Answer B

salasceciliacruz — 2024-06-12 19:25:56 UTC

A student used a video camera to record another student dropping a marble through water in a graduated cylinder. The students watched the video in slow motion and made the observations shown below.

During which part or parts of the marble’s fall did the marble experience unbalanced forces?

A Part 1 only

B Parts 1 and 2 only

C Part 3 only

D Parts 2 and 3 only

2015 STAAR Question 51 Answer A

salasceciliacruz — 2024-06-12 19:28:14 UTC

Which two elements on the periodic table are in the same period?

A Sn and Rb

B F and Cl

C K and Ba

D Se and Te

2015 STAAR Question 52 Answer H

salasceciliacruz — 2024-06-12 19:29:58 UTC

A student runs two times around a running path at a local park. Each lap is 3 km. The student completes the first lap in 20 minutes. The student then sits on a bench and rests for 5 minutes before completing the second lap in 25 minutes. Which graph best represents the student’s motion?

2015 STAAR Question 54 Answer G

salasceciliacruz — 2024-06-12 19:32:05 UTC

In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?

F H₃PO₄

G H₂SO₄

H HClO₃

J H₂O

2016 STAAR Question 3 Answer A

salasceciliacruz — 2024-06-13 19:22:21 UTC

Some students are using samples of different substances for a lab investigation. They plan to observe the physical properties of each substance and record their observations in a table like the one below.

Which of the substances observed are elements?

A S, Fe, O₂, Sr, and Al

B S, O₂, and LiF

C N₂O₄, O₂, and LiF

D N₂O₄, Fe, Sr, and Al

2016 STAAR Question 4 Answer G

salasceciliacruz — 2024-06-13 19:23:24 UTC

Two students are working together to build a birdhouse. Student 1 applies a force of 10 N to a wooden board in order to slide it across the table to Student 2.

If the force of friction resisting the student’s push is 4 N, what is the net force acting on the board?

F 4N

G 6N

H 10 N

J 14 N

2016 STAAR Question 6 Answer H

salasceciliacruz — 2024-06-13 19:26:25 UTC

Element R and Element Q have the same number of valence electrons. These elements both have similar chemical behavior, but Element R has fewer energy levels than Element Q.

Which statement best describes the positions of the two elements in the periodic table?

F The two elements are in the same period, with Element R the first element in the period and Element Q the last element. G The two elements are side by side in the same period, with Element Q to the left of Element R.

H The two elements are in the same group, with Element R just above Element Q.

J The two elements are in the same group, with Element Q at the top of the group and Element R at the bottom.

2016 STAAR Question 10 Answer F

salasceciliacruz — 2024-06-13 19:30:11 UTC

The graph below shows the motion of a ball rolling on a straight track.

What was the ball’s average speed during the time represented in the graph?

F 0.2 m/s

G 0.5 m/s

H 5.0 m/s

J 10.0 m/s

2016 STAAR Question 12 Answer G

salasceciliacruz — 2024-06-13 19:33:58 UTC

A student obtains two strips of magnesium, Mg, ribbon that are each 3 cm long. One strip of magnesium is placed in a test tube containing 5 mL of water, and the other strip is placed in a test tube containing 5 mL of hydrochloric acid, HCl. Both liquids are at room temperature. The student’s observations are recorded in the table.

Which statement is not supported by the student’s observations?

F A chemical reaction takes place between magnesium and hydrochloric acid.

G A gas is released in Test Tube 2.

H The substances in both test tubes are reactive only at high temperatures.

J Energy is released in the reaction involving hydrochloric acid.

2016 STAAR Question 16 Answer H

salasceciliacruz — 2024-06-13 19:39:00 UTC

The list includes six situations.

Which objects in the list experience an unbalanced force?

F The book, the ball, and the car

G The ball, the car, and the bird

H The can, the swing, and the bird

J The book, the ball, the can, and the swing

2016 STAAR Question 17 Answer 21

salasceciliacruz — 2024-06-13 19:39:32 UTC

What is the difference between the number of electrons in an atom of selenium, Se, and the number of electrons in an atom of aluminum, Al?

Record your answer and fill in the bubbles on your answer document. Be sure to use the correct place value.

2016 STAAR Question 19 Answer A

salasceciliacruz — 2024-06-13 19:43:10 UTC

Deep Space 1 was a spacecraft powered by an engine that gave off xenon particles to change velocity. It had a mass of 500 kg. Which expression can be used to find the spacecraft’s acceleration if its engine created a net force of 0.10 N?

A 0.10 N / 500 kg

B 500 kg x 0.10 N

C 500 kg / 0.10 N

D 500 kg + 0.10 N

2016 STAAR Question 20 Answer G

salasceciliacruz — 2024-06-13 19:44:47 UTC

Four students were given a list of compounds and asked to identify which ones are organic.

Which student correctly identified the organic compounds in the list?

F Student K

G Student L

H Student M

J Student N

2016 STAAR Question 22 Answer J

salasceciliacruz — 2024-06-13 19:47:27 UTC

The drawing shows two identical airplanes at an air show. The airplanes are flying at the same speed. Airplane W is flying 50 m higher than Airplane X.

Which statement best describes the energy of the two airplanes?

F Airplane W has a greater kinetic energy than Airplane X.

G The two airplanes have the same gravitational potential energy but different kinetic energies.

H Airplane X has more gravitational potential energy than Airplane W.

J The two airplanes have the same kinetic energy but different gravitational potential energies.

2016 STAAR Question 24 Answer G

salasceciliacruz — 2024-06-13 19:55:16 UTC

Four students were asked to name the parts of an atom that determine the atom’s identity and chemical properties. The students’ responses are shown in the table below.

Which student’s responses are correct?

F Student 1

G Student 2

H Student 3

J Student 4

2016 STAAR Question 25 Answer C

salasceciliacruz — 2024-06-13 19:56:26 UTC

A hobbyist collected data about the motion of a toy train on a straight track and then recorded the data in the graph below.

Which of these accurately describes the motion of the toy train?

A The toy train speeds up while going forward and then slows down.

B The toy train slows down while going forward and then moves backward.

C The toy train moves forward at a constant speed, slows down, and then stops.

D The toy train moves forward at an increasing speed, stops, and then moves forward.

2016 STAAR Question 27 Answer A

salasceciliacruz — 2024-06-13 19:59:49 UTC

Strontium phosphate, Sr₃(PO₄)₂ , is a crystalline substance used in medicine and industry. How many phosphorus atoms are represented in the formula for Sr₃(PO₄)₂ ?

A 2

B 3

C 4

D 8

2016 STAAR Question 28 Answer G

salasceciliacruz — 2024-06-13 20:00:47 UTC

During a lab investigation, students added four 50 g masses to two boxes and arranged the boxes so that they were motionless on a pulley, as shown in the diagram. The students then followed the procedure described in the box. The students recorded their observations after each procedure and reset the pulley system to the original conditions.

During which procedures did students observe an unbalanced upward force on Box 1?

F Procedures 1, 2, and 3

G Procedures 4 and 5

H Procedures 3 and 4

J Procedures 1, 3, and 5

2016 STAAR Question 30 Answer 49.97

salasceciliacruz — 2024-06-13 20:04:02 UTC

A chemical reaction in which calcium carbonate, CaCO₃, is decomposed results in the production of two simpler compounds.

CaCO₃ ---> CaO + CO₂

? g 28.00 g 21.97 g

What mass of calcium carbonate, to the nearest hundredth of a gram, is decomposed in this reaction?

Record your answer and fill in the bubbles on your answer document. Be sure to use the correct place value.

2016 STAAR Question 32 Answer F

salasceciliacruz — 2024-06-13 20:05:53 UTC

Students in a science class prepared flash cards so that they could quiz one another about the arrangement of the periodic table. One of the flash cards contained information about two elements, Element L and Element M.

The students had to use the information on the flash card to determine possible positions of the two elements on a blank periodic table. Which periodic table has the elements placed in locations that match the information on the flash card?

2016 STAAR Question 33 Answer C

salasceciliacruz — 2024-06-13 20:06:54 UTC

A clerk at a hardware store performed the activities in the list.

Which statement best describes the amount of work performed for the three activities?

A Activity 3 required more work than Activity 1, but Activity 3 did not require more work than Activity 2.

B Activity 1 required the same amount of work as Activity 3.

C Activity 2 required the most work.

D Activity 1 was the only activity that required work.

2016 STAAR Question 35 Answer A

salasceciliacruz — 2024-06-13 20:09:16 UTC

A teacher rubbed a match against a piece of sandpaper. The match started to burn. Which statement best describes the energy changes that occurred?

A The chemical energy stored in the match changed to thermal energy and light energy. B The thermal energy stored in the match changed to light energy and chemical energy.

C The light energy and thermal energy stored in the match changed to mechanical energy.

D The light energy and thermal energy stored in the match changed to chemical energy.

2016 STAAR Question 41 Answer D

salasceciliacruz — 2024-06-13 20:24:25 UTC

Nitrogen dioxide is a gas that can be generated by emissions from vehicles and factories. It can also be generated by natural sources, such as forest fires, lightning, and microbial activity in soil. The equation for producing nitrogen dioxide is shown below.

2NO + O2 ---> 2NO2

Colorless Colorless Brown

gas gas gas

Which of these provides evidence that a chemical reaction occurs?

A A gas is present.

B The total number of atoms remains unchanged.

C The state of matter remains the same.

D A brown gas is produced.

2016 STAAR Question 42 Answer H

salasceciliacruz — 2024-06-13 20:25:36 UTC

A student graphed the position of a cart during a 7-second time interval.

Which statement best describes the cart?

F The cart was stationary with a velocity of 0 m/s for the entire 7 seconds.

G The cart was stationary except for a short burst of acceleration of 0.5 m/s₂ .

H The cart moved at a constant velocity of 0.5 m/s for the entire 7 seconds.

J The cart accelerated at a constant rate of approximately 0.8 m/s₂ .

2016 STAAR Question 44 Answer 100

salasceciliacruz — 2024-06-13 20:27:30 UTC

A golfer hits a golf ball with a club. The mass of the ball is 0.05 kg. The ball accelerates at 2,000 m/s2 .

What is the net force, to the nearest newton, that accelerates the ball?

Record your answer and fill in the bubbles on your answer document. Be sure to use the correct place value.

2016 STAAR Question 45 Answer B

salasceciliacruz — 2024-06-13 20:28:25 UTC

How many protons, neutrons, and electrons are present in an atom of hafnium, Hf, with a mass number of 178?

A 72 protons, 178 neutrons, 106 electrons

B 72 protons, 106 neutrons, 72 electrons

C 178 protons, 250 neutrons, 72 electrons

D 106 protons, 72 neutrons, 106 electrons

2016 STAAR Question 47 Answer D

salasceciliacruz — 2024-06-13 20:30:17 UTC

The table shows the chemical formulas for four substances.

Which substances have the same number of carbon atoms? A Substances 1 and 2

B Substances 2, 3, and 4

C Substances 2 and 3 only

D Substances 1 and 3

2016 STAAR Question 48 Answer F

salasceciliacruz — 2024-06-13 20:31:30 UTC

NASA’s space shuttle program was active from 1981 until 2011. The photograph shows rockets carrying a space shuttle off the launchpad.

How can Newton’s law of action–reaction best be applied to explain the movement of a rocket?

F As the fuel burns, gases push against the rocket, moving it upward.

G As the fuel burns, gases move out of the rocket and reduce air resistance.

H As the fuel burns, the mass of the rocket decreases.

J As the fuel burns, the rocket moves faster.

2016 STAAR Question 52 Answer F

salasceciliacruz — 2024-06-13 20:35:26 UTC

Tin, Sn, is a soft white metal. It has a low melting point compared with other metals. Tin is widely used as a coating for cans of food. Which statement accurately describes atoms of tin?

F Tin atoms have 50 protons.

G Tin atoms have five valence electrons.

H Tin atoms have 119 neutrons.

J Tin atoms have 68 electrons.

2017 STAAR Question 1 Answer C

salasceciliacruz — 2024-06-17 17:28:26 UTC

A cook heats a meal in a microwave oven. What energy transformations occur between the microwave oven and the meal?

A Electrical energy--->light energy

--->chemical energy

B Chemical energy--->thermal energy

--->light energy

C Electrical energy--->electromagnetic energy--->thermal energy

D Chemical energy--->electromagnetic energy--->chemical energy

2017 STAAR Question 2 Answer G

salasceciliacruz — 2024-06-17 17:29:55 UTC

Students were asked to identify the location of elements in the periodic table based on clues printed on game cards.

Based on the data, which periodic table shows the correct location of the four elements?

2017 STAAR Question 7 Answer A

salasceciliacruz — 2024-06-17 17:35:01 UTC

A bicycle rider is traveling up a hill. When the rider reaches the top of the hill, she stops to rest. Then she travels down the hill. The diagram shows the rider in the three different positions.

Which of these correctly describes the potential energy and the kinetic energy of the bicycle rider?

A When the rider is at the top of the hill, her potential energy is the greatest, and her kinetic energy is the least.

B As the rider moves up the hill, her kinetic energy increases, and her potential energy decreases.

C When the rider goes down the hill, her potential energy increases, and her kinetic energy decreases.

D As the rider reaches the bottom of the hill, her kinetic energy and her potential energy decrease.

2017 STAAR Question 10 Answer J

salasceciliacruz — 2024-06-17 17:40:25 UTC

Which statement correctly describes the location and charge of the electrons in an atom?

F The electrons are inside the nucleus and have no charge.

G The electrons are outside the nucleus and have no charge.

H The electrons are inside the nucleus and have a negative charge.

J The electrons are outside the nucleus and have a negative charge.

2017 STAAR Question 11 Answer 300

salasceciliacruz — 2024-06-17 17:42:03 UTC

An archer shot a 0.06 kg arrow at a target. The arrow accelerated at 5,000 m/s2 to reach a speed of 50.0 m/s as it left the bow. During this acceleration, what was the net force on the arrow to the nearest newton? Record your answer and fill in the bubbles on your answer document. Be sure to use the correct place value.

2017 STAAR Question 13 Answer B

salasceciliacruz — 2024-06-17 17:45:17 UTC

The table lists some compounds found in foods and their formulas.

Based on this information, which of these statements is NOT true?

A A molecule of sorbitol contains three more oxygen atoms than a molecule of glutamine does.

B A molecule of lactose contains twice as many atoms as a molecule of fructose does.

C A molecule of fructose contains four more atoms than a molecule of glutamine does.

D A molecule of lactose contains twice as many carbon atoms as a molecule of sorbitol does.

2017 STAAR Question 15 Answer D

salasceciliacruz — 2024-06-17 17:49:37 UTC

The unusual strength of a glue makes it able to hold a heavy object, or load, as shown in the diagram below.

If the load exerts a strong downward force, the glue —

A destroys the force

B exerts a stronger downward force

C causes the load to accelerate upward

D exerts an upward force that is equal to the downward force

2017 STAAR Question 22 Answer F

salasceciliacruz — 2024-06-17 18:30:05 UTC

A meteor moving 468 km per minute traveling in a south-to-north direction passed near Earth in 2013. Because the meteor was only 45 m wide and was 27,700 km above Earth’s surface, it was not visible without the aid of a telescope.

Which statement describes the meteor’s motion?

F Its velocity was 7.8 km/s northward.

G Its acceleration was 468 km/s².

H Its speed was 468 km/s northward.

J Its acceleration was 7.8 km/s².

2017 STAAR Question 23 Answer B

salasceciliacruz — 2024-06-17 18:33:23 UTC

A chemist made the table below to record some atomic properties of four elements.

Based on the information in the table, which conclusion about the chemical reactivity of these elements is valid?

A Boron is the most reactive because it has the most protons.

B Fluorine is the most reactive because it has 7 electrons in the outer shell.

C Silicon is the most reactive because it has an equal number of protons and neutrons.

D Gallium is the most reactive because it has many more neutrons than protons.

2017 STAAR Question 25 Answer A

salasceciliacruz — 2024-06-17 18:40:39 UTC

Two forces are applied to a 17 kg box, as shown. The box is on a smooth surface.

Which statement best describes the acceleration of the box?

A The box accelerates at 1.0 m/s2 to the right because the net force is 17 N to the right.

B The box accelerates at 1.9 m/s2 to the right because the greater force is to the right.

C The box accelerates at 3.0 m/s2 because the combined forces cause the box to accelerate.

D The box does not accelerate, because neither force is large enough to move the box.

2017 STAAR Question 26 Answer G

salasceciliacruz — 2024-06-17 18:43:03 UTC

A silver ring reacts with compounds containing sulfur in the air to form silver sulfide, a black substance that makes up the tarnish on the surface of silver objects. To remove the tarnish from the ring, students placed it in a pan lined with aluminum foil and added hot water. Baking soda was added to the hot water and stirred. Students made observations about the process. Which observation of this process provides evidence of a chemical reaction?

F Hot water heated the aluminum foil.

G The liquid solution changed color.

H The pan was lined with aluminum foil.

J The hot water cooled.

2017 STAAR Question 29 Answer C

salasceciliacruz — 2024-06-17 18:48:05 UTC

A golfer collected data on the distance a golf cart traveled in a straight line and plotted it on a graph.

Which of these does NOT describe the cart’s motion on this graph?

A The cart moved 24 m away from the starting point between 2 s and 5 s.

B The cart moved toward the starting point at a speed of 3 m/s between 7 s and 12 s.

C The cart moved 11 m toward the starting point between 8 s and 10 s.

D The cart moved away from the starting point at a speed of 1 m/s for 2 s.

2017 STAAR Question 30 Answer J

salasceciliacruz — 2024-06-17 18:48:50 UTC

Which pair of properties describes the elements in Group 18?

F They are chemically stable and liquid at room temperature.

G They have eight valence electrons and are flammable.

H They are magnetic and boil at low temperatures.

J They are gaseous at room temperature and chemically stable.

2017 STAAR Question 32 Answer 160

salasceciliacruz — 2024-06-17 18:50:12 UTC

What is the total number of protons, neutrons, and electrons in a cadmium, Cd, atom that has a mass number of 112?

Record your answer and fill in the bubbles on your answer document. Be sure to use the correct place value.

2017 STAAR Question 34 Answer J

salasceciliacruz — 2024-06-17 18:58:26 UTC

A student kicks a soccer ball three times. Another student records the distance, the amount of time the ball travels, and the average speed in the table shown below.

How many seconds did it take for the ball to travel 30 m during Kick 3?

F 0.5 s

G 1.0 s

H 1.5 s

J 2.0 s

2017 STAAR Question 36 Answer J

salasceciliacruz — 2024-06-17 19:00:57 UTC

A manufacturer selected a metal to use in producing a lightweight button for clothing. A metal that has a density of 2.71 g/cm³ was selected.

Which of the metals was selected?

F Metal 1

G Metal 2

H Metal 3

J Metal 4

2017 STAAR Question 40 Answer G

salasceciliacruz — 2024-06-17 19:05:50 UTC

A leaf fell from a tree branch. The path it followed is shown in the diagram below.

Which of these best describes why the leaf fell in a crooked path instead of straight down?

F Objects with irregular shapes never fall in straight lines.

G Air currents and gravity applied changing and unbalanced forces to the leaf.

H The upward force of the air on the leaf was greater than the downward force of gravity.

J Once the leaf was in motion, it continued moving in the same direction because the forces were balanced.

2017 STAAR Question 42 Answer H

salasceciliacruz — 2024-06-17 19:07:53 UTC

A student is using colored beads to make a model of aluminum sulfate, Al (SO ) 2 4 3. Aluminum atoms are represented by blue beads, sulfur atoms by yellow beads, and oxygen atoms by green beads. What combination of beads should the student use for the model?

F 6 blue, 3 yellow, and 7 green

G 2 blue, 1 yellow, and 4 green

H 2 blue, 3 yellow, and 12 green

J 6 blue, 12 yellow, and 12 green

2019 STAAR Question 3 Answer A

salasceciliacruz — 2024-06-24 19:19:33 UTC

Atoms of which two elements have a combined total of 23 protons?

A Sodium, Na, and magnesium, Mg

B Boron, B, and carbon, C

C Copper, Cu, and zinc, Zn

D None of these

2019 STAAR Question 6 Answer J

salasceciliacruz — 2024-06-24 19:22:45 UTC

A mother and daughter press their hands together and then push apart while ice skating.

Immediately after they push away from each other, how does the motion of the mother and daughter change?

F The mother moves forward, and the daughter moves backward with a greater acceleration.

G Both move forward, but the mother moves with a greater acceleration.

H The mother moves backward, and the daughter moves forward with a greater acceleration.

J Both move backward, but the daughter moves with a greater acceleration.

2019 STAAR Question 8 Answer G

salasceciliacruz — 2024-06-24 19:25:31 UTC

Which statement best describes evidence that a chemical reaction occurs as a cake bakes?

F The water in the cake batter evaporates.

G The cake rises as gas bubbles form in the baking cake.

H The cake takes the shape of the container in which it is baked.

J The water in the cake batter is used to keep the cake moist as it bakes.

2019 STAAR Question 10 Answer F

salasceciliacruz — 2024-06-24 19:28:09 UTC

A student is trying to classify an unidentified, solid gray material as a metal or a nonmetal. Which question will best help the student classify the material?

F Is the material malleable or ductile?

G Does the material feel hard to the touch? H Will the material float in water?

J Does the material feel rough or smooth?

2019 STAAR Question 10 Answer 1200

salasceciliacruz — 2024-06-24 19:28:42 UTC

The net force on a vehicle that is accelerating at a rate of 1.5 m/s2 is 1,800 newtons.

What is the mass of the vehicle to the nearest kilogram?

Record your answer and fill in the bubbles on your answer document. Be sure to use the correct place value.

2019 STAAR Question 13 Answer D

salasceciliacruz — 2024-06-24 19:33:38 UTC

A scientist performs tests on a sample of an element. The element is a shiny solid that conducts electricity and heat. The scientist is able to bend and flatten the sample when pressure is applied to it.

Based on this information, the element could NOT be a member of which group on the periodic table?

A Group 2

B Group 8

C Group 12

D Group 18

2019 STAAR Question 14 Answer G

salasceciliacruz — 2024-06-24 19:35:03 UTC

A demonstration helps students understand a principle of roller coaster design.

Which answer choice correctly describes the ball’s kinetic and potential energy?

F The ball has more potential energy at position X than at position Z.

G The ball has more kinetic energy at position Y than at position W.

H The potential energy and kinetic energy of the ball are equal at position X.

J The potential energy and kinetic energy of the ball are greatest at position Z.

2019 STAAR Question 16 Answer H

salasceciliacruz — 2024-06-24 19:36:41 UTC

A large rock is motionless on a flat sidewalk. Which statement best explains why the rock remains motionless?

F There are no forces acting on the rock.

G The only force acting on the rock is directed toward the sidewalk.

H The forces acting on the rock are all balanced.

J The sidewalk exerts an unbalanced force on the rock.

2019 STAAR Question 17 Answer B

salasceciliacruz — 2024-06-24 19:38:19 UTC

A compound secreted by honeybees to paralyze intruders in their hive is known as 2-heptanone. The formula for this compound is shown.

CH₃C₄H₈COCH₃

How many atoms of each element are in one molecule of 2-heptanone?

A 4 carbon atoms, 11 hydrogen atoms, and 1 oxygen atom

B 7 carbon atoms, 14 hydrogen atoms, and 1 oxygen atom

C 7 carbon atoms, 11 hydrogen atoms, and 8 oxygen atoms

D 6 carbon atoms, 14 hydrogen atoms, and 3 oxygen atoms

2019 STAAR Question 20 Answer F

salasceciliacruz — 2024-06-24 19:41:30 UTC

A diagram of the electromagnetic spectrum is shown.

Earth’s atmosphere blocks short wavelengths of the electromagnetic spectrum. Which telescopes must be placed in orbit around Earth in order to observe short-wavelength radiation?

F Gamma-ray telescopes

G Visible-light telescopes

H Infrared telescopes

J Radio telescopes

2019 STAAR Question 22 Answer H

salasceciliacruz — 2024-06-24 19:44:30 UTC

The mass of an unidentified rock is 15.5 grams. Students determine the volume of the rock by placing the rock in a cylinder with water. The students calculate the density of the rock. They determine the identity of the rock based on the density ranges in the table.

The students most likely have which type of rock?

F Coal

G Dolomite

H Peridotite

J Sandstone

2019 STAAR Question 25 Answer A

salasceciliacruz — 2024-06-24 19:46:52 UTC

The distance a toy car travels over time is shown in the graph.

Which table best shows the average speed of the toy car at different time intervals?

2019 STAAR Question 26 Answer H

salasceciliacruz — 2024-06-24 19:48:00 UTC

The blades of a wind turbine are at rest until the movement of air causes the blades to spin.

Which energy transformation happens when the blades are spinning as shown?

F Electrical to mechanical

G Chemical to electrical

H Mechanical to electrical

J Chemical to mechanical

2019 STAAR Question 29 Answer C

salasceciliacruz — 2024-06-24 19:51:55 UTC

The atomic number of krypton is 36. If the mass number of a krypton atom is 84, which table shows the number of subatomic particles inside and outside the nucleus of the krypton atom?

2019 STAAR Question 32 Answer 2

salasceciliacruz — 2024-06-24 19:54:23 UTC

Barium sulfate, BaSO₄ , is a white crystalline solid that is insoluble in water. It is used by doctors to diagnose problems with the digestive system. Barium hydroxide, Ba(OH)₂ , is also a white crystalline solid and is used in wastewater treatment.

How many more oxygen atoms are represented in the formula for barium sulfate than in the formula for barium hydroxide? Record your answer and fill in the bubbles on your answer document. Be sure to use the correct place value.

2019 STAAR Question 34 Answer F

salasceciliacruz — 2024-06-24 19:56:45 UTC

The graph shows the distance an object traveled in 11 seconds.

Which answer choice best describes the movement of the object between the times of 0 and 6 seconds on the graph?

F Moving at a constant speed

H Moving toward the north

G Accelerating

J Stopped

2019 STAAR Question 36 Answer F

salasceciliacruz — 2024-06-24 19:58:34 UTC

The diagrams show forces acting on a toy car as it moves to the right. Which diagram shows the toy car that will most likely accelerate to the right based on these conditions?

2019 STAAR Question 38 Answer J

salasceciliacruz — 2024-06-24 20:00:24 UTC

The diagram shows a model of an atom. The model has four different symbols on it. Each symbol represents a different role for one of the particles within the atom.

In this model, which particle determines the reactivity of this atom?

F Particle W

G Particle X

H Particle Y

J Particle Z

2019 STAAR Question 41 Answer D

salasceciliacruz — 2024-06-24 20:05:19 UTC

A pitcher throws a ball toward a player holding a softball bat. The player uses the bat to hit the ball. The bat applies a 10-newton force to the ball.

Which statement correctly describes the reaction force between the bat and ball?

A The reaction force is the force that causes the ball to move toward the bat.

B The reaction force is the force applied to the bat by the player holding the bat.

C The reaction force is the force that pulls the ball toward the ground.

D The reaction force is the force of the ball on the bat.

2019 STAAR Question 42 Answer G

salasceciliacruz — 2024-06-24 20:06:43 UTC

Researchers are investigating processes that happen during digestion. Which answer choice describes only a physical change during digestion?

F Hydrochloric acid in the stomach breaks down proteins.

G Chewing in the mouth breaks food into small pieces.

H Enzymes in saliva start the digestion of starches before food is swallowed.

J Bacteria in the intestines convert dietary fiber into fats.

2021 STAAR Question 2 Answer H

salasceciliacruz — 2024-06-25 16:24:09 UTC

A steel ball is at one end of a box that is moving forward as shown. The box suddenly stops.

According to Newton’s first law, what happens to the steel ball just after the box stops?

F Because of friction, the ball continues rolling forward at the same speed.

G Because of friction, the ball rolls forward at an increased speed.

H Because of inertia, the ball continues rolling forward at the same speed.

J Because of inertia, the ball rolls forward at an increased speed.

2021 STAAR Question 3 Answer D

salasceciliacruz — 2024-06-25 16:25:20 UTC

Students mixed two liquids in a beaker and listed their observations.

Based on these observations, which statement contains the best evidence that a chemical reaction occurred?

A There is a change in shape.

B There is a change in volume.

C The two liquids mix into a solution.

D The two liquids form a new substance.

2021 STAAR Question 6 Answer F

salasceciliacruz — 2024-06-25 16:29:18 UTC

A student pushes a 51.5 kilogram bookshelf across a smooth floor with a net force of 67 N.

What is the approximate acceleration of the bookshelf?

F 1.3 m/s²

G 3,450.5 m/s²

H 15.5 m/s²

J 0.77 m/s²

2021 STAAR Question 8 Answer F

salasceciliacruz — 2024-06-25 16:31:27 UTC

Which pair of elements are nonmetals and gases at room temperature and normal atmospheric pressure?

F Fluorine, F, and chlorine, Cl

G Boron, B, and aluminum, Al

H Hydrogen, H, and cesium, Cs

J Cobalt, Co, and nickel, Ni

2021 STAAR Question 10 Answer F

salasceciliacruz — 2024-06-25 16:34:21 UTC

A student investigates the motion of a toy vehicle. The student graphs 40 seconds of data from the investigation.

Which statement best describes the motion of the toy vehicle during the first 30 seconds of the investigation?

F The vehicle was traveling at a constant speed.

G The vehicle was accelerating at a constant rate.

H The speed of the vehicle was increasing.

J The acceleration of the vehicle was increasing.

2021 STAAR Question 11 Answer 20

salasceciliacruz — 2024-06-25 16:34:44 UTC

How many neutrons are in the nucleus of a potassium atom with a mass number of 39? Record your answer and fill in the bubbles on your answer document. Be sure to use the correct place value.

2021 STAAR Question 14 Answer F

salasceciliacruz — 2024-06-25 16:37:45 UTC

Which statements correctly compare metals and nonmetals?

F Metals tend to be good conductors of thermal energy. Nonmetals tend to be good insulators of thermal energy.

G Metals are dull and brittle. Nonmetals are shiny and malleable.

H Metals are good insulators of electricity. Nonmetals tend to be good conductors of electricity.

J Metals cannot be stretched into thin wires. Nonmetals can be stretched into thin wires.

2021 STAAR Question 15 Answer C

salasceciliacruz — 2024-06-25 16:38:23 UTC

Roller coasters are popular attractions at amusement parks. A cart on a roller coaster approaches the highest point on the coaster. As the cart reaches the top, it slows down. Which statement best describes the energy of the roller coaster as it slows down while traveling to the top of the coaster?

A The cart gains both kinetic and potential energy.

B The cart gains kinetic energy and loses potential energy.

C The cart loses kinetic energy and gains potential energy.

D The cart loses both kinetic and potential energy.

2021 STAAR Question 17 Answer C

salasceciliacruz — 2024-06-25 16:40:34 UTC

The names and chemical formulas of four substances are shown in the chart.

Which substance listed in the chart is made up of the most atoms?

A Carbonic acid

B Nitric acid

C Phosphoric acid

D Sulfuric acid

2021 STAAR Question 20 Answer H

salasceciliacruz — 2024-06-25 16:43:48 UTC

The diagram shows a duck swimming in a stream in the opposite direction the stream is flowing. The duck pushes against the water, so the water pushes the duck forward with 20 newtons of force. The water also exerts 15 newtons of resistive force against the duck.

Which statement best describes the resulting motion of the duck?

F The duck will stop moving.

G The duck will stop and then start moving again.

H The duck will continue moving in its current direction.

J The duck will move in the direction that the stream is flowing.

2021 STAAR Question 21 Answer B

salasceciliacruz — 2024-06-25 16:45:56 UTC

A student measures the mass and volume of a small cube made of an unknown metal. The mass of the cube is 25.0 g, and the volume of the cube is 3.19 cm3 . The student is told that the cube is a sample of one of the four metals listed in the table.

Based on the data given, the unknown metal is most likely —

A gold

B iron

C silver

D tin

2021 STAAR Question 22 Answer J

salasceciliacruz — 2024-06-25 16:47:00 UTC

The temperature of a star determines the wavelength of visible light that is produced. The visible part of the electromagnetic spectrum is shown.

Stars with the highest temperatures will emit most of their light at wavelengths that are near —

F red light

G orange light

H green light

J blue light

2021 STAAR Question 24 Answer H

salasceciliacruz — 2024-06-25 16:52:58 UTC

Students build a circuit. The circuit has wires that connect a battery to a switch and a fan. Which energy transformations happen when the students close the circuit and the blades of the fan begin to spin?

F Chemical to mechanical to electrical

G Electrical to chemical to mechanical

H Chemical to electrical to mechanical

J Mechanical to electrical to chemical

2021 STAAR Question 25 Answer D

salasceciliacruz — 2024-06-25 16:55:35 UTC

Students create a table that lists processes observed in nature.

Which process describes only a physical change?

A Process 1

B Process 2

C Process 3

D Process 4

2021 STAAR Question 28 Answer F

salasceciliacruz — 2024-06-25 16:59:12 UTC

A skater pushes off a wall and skates backward for a few meters before stopping.

Which statement best describes an action–reaction force pair in this situation?

F The wall pushes on the skater when the skater pushes on the wall.

G The wheels slow down, and the skater stops.

H The skater exerts a force on the wall, and the wheels exert a force on the floor and begin to turn.

J The friction of the floor decreases when the wheels roll on the floor.

2021 STAAR Question 32 Answer 0.3

salasceciliacruz — 2024-06-25 17:04:26 UTC

A horse trainer records the distance a horse travels during three different trials.

What is the horse’s average speed in kilometers per minute?

2021 STAAR Question 35 Answer B

salasceciliacruz — 2024-06-25 17:07:07 UTC

Which pair of elements has reactivity that is similar to chlorine, Cl?

A Fluorine, F, and argon, Ar

B Fluorine, F, and iodine, I

C Sulfur, S, and bromine, Br

D Sulfur, S, and argon, Ar

2021 STAAR Question 37 Answer C

salasceciliacruz — 2024-06-25 17:09:25 UTC

Two solutions are mixed and react to produce the solid precipitate AgCl. The chemical reaction is shown by the balanced chemical equation.

AgNO₃ + NaCI ---> AgCI + NaNo₃

What happens to the total mass as the reaction takes place?

A The mass increases.

B The mass decreases.

C The mass remains constant.

D The mass first decreases and then increases.

2021 STAAR Question 39 Answer B

salasceciliacruz — 2024-06-25 17:10:45 UTC

A toy truck is at rest on the floor. Which statement describes the forces acting on the toy truck?

A The forces are balanced so motion occurs. B The forces are balanced so no motion occurs.

C The forces are unbalanced so motion occurs.

D The forces are unbalanced so no motion occurs.

2021 STAAR Question 40 Answer F

salasceciliacruz — 2024-06-25 17:11:30 UTC

One of the properties that makes copper, Cu, useful for household wiring is its ability to conduct electricity. Which other element is most likely to conduct electricity?

F Gold, Au

G Radon, Rn

H Bromine, Br

J Nitrogen, N

2022 STAAR Question 2 Answer F

salasceciliacruz — 2024-07-02 18:09:31 UTC

Sodium and lithium have similar chemical properties. What characteristic of these elements explains why they are chemically similar?

F Their atoms both have one valence electron.

G Their atoms both have more neutrons than protons.

H Their atoms have the same number of energy levels.

J Their atoms contain equal numbers of protons and electrons.

2022 STAAR Question 5 Answer C

salasceciliacruz — 2024-07-02 18:12:38 UTC

The diagram shows a model of an atom. The model contains three different subatomic particles. Particles X and Y are inside the nucleus, and particle Z is outside of the nucleus.

Which statements best describe the charges on the particles in this model?

A Both particles X and Y have a positive charge. Particle Z has a negative charge.

B Both particles X and Y have a negative charge. Particle Z has a positive charge.

C Either particle X or particle Y has a positive charge. Particle Z has a negative charge.

D Either particle X or particle Y has a negative charge. Particle Z has a positive charge.

2022 STAAR Question 6 Answer J

salasceciliacruz — 2024-07-02 18:14:03 UTC

A photograph of a bird perched on a fence post is shown.

Which description best identifies the action-reaction pair between the bird and the fence post?

F Action: The force of the bird on the wires Reaction: The force of the wires on the fence post

G Action: The force of the wires on the fence post Reaction: The force of the fence post on the bird

H Action: The force of the fence post on the bird Reaction: The force of the bird on the wires

J Action: The force of the bird on the fence post Reaction: The force of the fence post on the bird

2022 STAAR Question 9 Answer C

salasceciliacruz — 2024-07-02 18:17:18 UTC

Two students record the distance they each traveled in 60 seconds in the data table shown.

If the students continue at the same speed, which statement describes the total distance traveled after 90 seconds?

A Student 1 traveled 40 m, and student 2 traveled 20 m.

B Student 1 traveled 50 m, and student 2 traveled 30 m.

C Student 1 traveled 60 m, and student 2 traveled 30 m.

D Student 1 traveled 70 m, and student 2 traveled 25 m.

2022 STAAR Question 11 Answer 14

salasceciliacruz — 2024-07-02 18:18:41 UTC

A sledgehammer has a mass of 3.5 kilograms.

What net force, to the nearest whole newton, will a person need to apply to accelerate the sledgehammer at a rate of 4.0 m/s2 ?

Record your answer and fill in the bubbles on your answer document. Be sure to use the correct place value.

2022 STAAR Question 12 Answer F

salasceciliacruz — 2024-07-02 18:20:22 UTC

Students collected data on five elements. Their data are shown in the table.

Which element has the same number of energy levels as lithium?

F Beryllium

G Sodium

H Magnesium

J Potassium

2022 STAAR Question 14 Answer H

salasceciliacruz — 2024-07-02 18:24:09 UTC

Oxygen and oxygen-containing compounds are involved in many different reactions. Which balanced equation represents a reaction that involves 14 atoms of oxygen?

F NH₄Cl + KOH → NH₃ + H₂O + KCl

G 2Na + 2H₂O → 2NaOH + H₂

H 2 C₂H₆ + 7O₂ → 4CO₂ + 6H₂O

J 4Fe + 3O₂ → 2Fe₂O₃

2022 STAAR Question 16 Answer H

salasceciliacruz — 2024-07-02 18:30:30 UTC

A Texas Gulf Coast energy pyramid is shown with representative organisms at each trophic level.

Which statement best describes the flow of energy through this pyramid?

F The trophic level represented by catfish and gobies receives energy directly from the producers.

G The trophic level represented by shrimp and copepods receives energy directly from the tertiary consumers.

H The trophic level represented by redfish and flounder receives energy directly from the secondary consumers.

J The trophic level represented by wire grass and phytoplankton receives energy directly from the primary consumers.

2022 STAAR Question 19 Answer C

salasceciliacruz — 2024-07-02 18:32:32 UTC

Which of these observations is an indication that a chemical reaction has occurred?

A Steam forms above boiling water.

B A solid forms when a clear solution is frozen.

C A solid forms when two clear solutions are mixed.

D Sugar crystals form on the sides of a boiling pot of sugar water.

2022 STAAR Question 22 Answer F

salasceciliacruz — 2024-07-02 18:35:42 UTC

The diagram shows how a cylinder in a car engine causes the car to move.

Which description of the energy conversions in this process is correct?

F The chemical energy in the fuel-air mixture is converted to thermal energy, which is then converted to mechanical energy.

G The mechanical energy in the fuel-air mixture is converted to electrical energy, which is then converted to thermal energy.

H The electrical energy in the fuel-air mixture is converted to mechanical energy, which is then converted to thermal energy.

J The thermal energy in the fuel-air mixture is converted to electrical energy, which is then converted to mechanical energy.

2022 STAAR Question 25 Answer A

salasceciliacruz — 2024-07-02 18:37:53 UTC

A car initially traveling at 8.0 meters per second doubles its speed while traveling in a northeast direction. Students used a table to record the initial and final conditions for speed and velocity. Which table is correct?

2022 STAAR Question 26 Answer H

salasceciliacruz — 2024-07-02 18:38:36 UTC

Which element has chemical properties that are most similar to the chemical properties of sulfur, S?

F Silicon, Si

G Chlorine, Cl

H Selenium, Se

J Phosphorus, P

2022 STAAR Question 28 Answer F

salasceciliacruz — 2024-07-02 18:40:35 UTC

The speed of an object over time is shown in the graph.

Which table describes the object’s motion?

2022 STAAR Question 31 Answer D

salasceciliacruz — 2024-07-02 18:52:12 UTC

A student prepared diagrams to model atoms of two elements.

Atoms of which two elements are represented by these models?

A Oxygen‚ O, and neon, Ne

B Fluorine, F, and neon, Ne

C Silicon, Si, and phosphorus, P

D Beryllium, Be, and boron, B

2022 STAAR Question 32 Answer 10

salasceciliacruz — 2024-07-02 18:52:40 UTC

If a fluorine atom has a mass number of 19, how many neutrons are in the atom?

Record your answer and fill in the bubbles on your answer document. Be sure to use the correct place value.

2022 STAAR Question 33 Answer C

salasceciliacruz — 2024-07-02 18:53:52 UTC

Four students designed and built air propelled rockets that were launched into the air. Their data are recorded in the table.

Which rocket had the greatest acceleration? A Rocket 1

B Rocket 2

C Rocket 3

D Rocket 4

2022 STAAR Question 35 Answer A

salasceciliacruz — 2024-07-02 18:56:49 UTC

The picture shows a bicyclist increasing speed while riding down a hill during a bicycle race.

Which statements accurately describe the potential and kinetic energy of this bicyclist?

A Kinetic energy increases.

Potential energy decreases.

B Kinetic energy increases.

Potential energy remains constant.

C Kinetic energy remains constant.

Potential energy decreases.

D Kinetic energy remains constant. Potential energy increases.

2022 STAAR Question 38 Answer F

salasceciliacruz — 2024-07-02 19:00:03 UTC

When a coin is tossed in the air, it travels upward, gradually slows down, momentarily reaches zero speed, then moves back downward with increasing speed. Which statement best explains this change in the coin’s motion?

F The force of gravity causes the coin to change its velocity.

G The coin’s inertia decreases on the way up and increases on the way down.

H The action-reaction force pair of gravity and the applied force cancel each other.

J The coin remains in its state of upward motion until the force of friction acts upon it.

2022 STAAR Question 40 Answer H

salasceciliacruz — 2024-07-02 19:01:27 UTC

Students performed a lab investigation on chemical reactions. The students put on goggles and plastic gloves and then followed these steps.

Which observation would indicate that a chemical reaction occurred?

F The vinegar took the shape of the container in step 1.

G The steel wool sank into the vinegar in step 3.

H The temperature of the vinegar increased during step 4.

J The steel wool changed shape during step 6.

2022 STAAR Question 42 Answer G

salasceciliacruz — 2024-07-02 19:03:07 UTC

The chart shows properties of four elements.

Based on these properties, which element is most likely a nonmetal?

F Element 1

G Element 2

H Element 3

J Element 4

2023 STAAR Question 2 Answer D

salasceciliacruz — 2024-07-02 19:08:13 UTC

A plastic tube is arranged on a lab tabletop as shown. A small sphere enters one end of the tube with enough speed to come out the other end of the tube.

Which diagram shows where the sphere will go first when it leaves the tube?

2023 STAAR Question 3 Answer 2

salasceciliacruz — 2024-07-02 19:10:25 UTC

Sodium Sulfate (Na2SO4) is used to produce many products.

Which elements are represented in the formula AND how many atoms of each element are represented in the formula?

Read the question carefully. Then enter your answer in the box provided.

2023 STAAR Question 9 Answer D

salasceciliacruz — 2024-07-02 19:22:27 UTC

Which of these statements about the mass of subatomic particles is true?

A The mass of a proton is the same as the mass of an electron.

B The mass of a neutron is the same as the mass of an electron.

C The mass of a neutron is much greater than the mass of a proton.

D The mass of a proton is much greater than the mass of an electron.

2023 STAAR Question 11 Answer B

salasceciliacruz — 2024-07-02 19:34:13 UTC

Students push a cart along a smooth floor and collect data to produce the graph shown.

2023 STAAR Question 11 Answer B

salasceciliacruz — 2024-07-02 19:35:51 UTC

The students use this data to determine and graph the velocity of the cart. Which graph accurately represents the velocity of the cart?

2023 STAAR Question 14 Answer C

salasceciliacruz — 2024-07-02 19:41:07 UTC

2023 STAAR Question 15 Part 1 Answer C Part 2 Answer C

salasceciliacruz — 2024-07-02 19:42:14 UTC

2023 STAAR Question 16 Answer metals, valence electrons

salasceciliacruz — 2024-07-02 19:43:23 UTC

2023 STAAR Question 19 Answer 4 or 4.0

salasceciliacruz — 2024-07-02 19:46:04 UTC

2023 STAAR Question 20 Answer B

salasceciliacruz — 2024-07-02 19:46:34 UTC

2023 STAAR Question 21 Answer C

salasceciliacruz — 2024-07-02 19:47:25 UTC

2023 STAAR Question 23 Answer C

salasceciliacruz — 2024-07-02 19:48:29 UTC

2023 STAAR Question 24 Answer below

salasceciliacruz — 2024-07-02 19:50:07 UTC

1- Metalloid

2- Nonmetal

3- Metal

4- Metal

5- Metal

2023 STAAR Question 27 Answer B

salasceciliacruz — 2024-07-02 19:52:18 UTC

2023 STAAR Question 28 Answer C

salasceciliacruz — 2024-07-02 19:52:47 UTC

2023 STAAR Question 30 Answer C

salasceciliacruz — 2024-07-02 19:55:37 UTC

2023 STAAR Question 32 Answer below

salasceciliacruz — 2024-07-02 19:57:56 UTC

Enter your answer in the box.

The student describes both the student's push and friction as the forces affecting the block's motion before release. The student also identifies that these forces affect the block's acceleration (or change in velocity).

2023 STAAR Question 33 Answer B

salasceciliacruz — 2024-07-02 19:58:31 UTC

2023 STAAR Question 36 Answer A

salasceciliacruz — 2024-07-02 19:59:53 UTC

2023 STAAR Question 37 Answer A

salasceciliacruz — 2024-07-02 20:00:16 UTC