# data[].attributes.body
How many moles are there in 60g of sodium hydroxide, NaOH? ( Na= 23, O =16 , H= 1)

# data[].attributes.body
A mechanic uses  a 15 cm long spanner and applies a force of 300N at the end of a spanner to undo a nut. What is the moment that he applies? (Give your answer in correct unit)

# data[].attributes.headline
Question 2: Calculating principle moment

# data[].attributes.subject
Question 2: Calculating principle moment

# data[].attributes.body
Explain how water uptake from root to leaves

# data[].attributes.body
How carbon dioxide and water can be obtained in plants to make photosynthesis?

# data[].attributes.body
Complete the equation above. HINT : Na is more reactive that H
Na(s)+H2​O(l) ------>

​

​​

# data[].attributes.body
Define exothermic and endothermic reaction. Give one example of exothermic and endothermic reaction

# data[].attributes.body
What is the correct final equation for the reaction between Cl2 and KI? HINT : You must take a look at reactivity series of Halogen

Cl2 + KI ------->

# data[].attributes.headline
Question 3: Redox reaction ( Oxidation number)

# data[].attributes.subject
Question 3: Redox reaction ( Oxidation number)

# data[].attributes.body
Identify which element is having oxidation and reduction? HINT : Look at the oxidation state number
3 Hg²⁺ + 2 Fe (s) ------>  3 Hg₂ + 2 Fe3+

# data[].attributes.headline
Question 4 : Redox reaction ( Presence and losing of Oxygen)

# data[].attributes.subject
Question 4 : Redox reaction ( Presence and losing of Oxygen)

# data[].attributes.body
Identify which element is having oxidation and reduction. HINT : Look at the presence and losing of oxygen

2Mg + CO2 ---> 2MgO + C

# data[].attributes.headline
Assignment : Animal Nutrition (3/1/2022)

# data[].attributes.subject
Assignment : Animal Nutrition (3/1/2022)

# data[].attributes.body
Question 1: A balanced diet contains these nutrients:
Carbohydrates  fats  proteins  vitamins  minerals  water

a. Which of these nutrients can provide energy?
b. What is role of proteins in the diet?
c. What role of fibre in the diet?

# data[].attributes.body
List three health problems associated with obesity

# data[].attributes.body
What is coronary heart disease?

# data[].attributes.body
Define malnutrition

# data[].attributes.body
What is the difference between starvation and malnutrition?

# data[].attributes.body
What is meant by deficiency disease?

# data[].attributes.body
Give three examples of deficiency disease

# data[].attributes.body
What is digestion?

# data[].attributes.body
Name two groups of food that do not need to be digested.

# data[].attributes.body
What does digestion change each of these kinds of food into?
a. Carbohydrate
b. Protein
c. Fats

# data[].attributes.body
What is meant by mechanical digestion and chemical digestion?

# data[].attributes.body
What enzymes that responsible to digest protein in stomach?

# data[].attributes.body
Give three examples of mechanical digestion

# data[].attributes.body
What is plaque?

# data[].attributes.body
What are incisors used for?

# data[].attributes.body
Explain how tooth decay happen

# data[].attributes.body
Question 1: Oxides are classified as acidic, basic, neutral and amphoteric. Give the pH of solution and one example for each of these oxides.

# data[].attributes.body
Explain the term amphoteric

# data[].attributes.body
Name two reagent that are needed to show that an amphoteric
HINT : give one example of acid and bases

# data[].attributes.body
Describe how wolud use litmus to test if a solution is a acidic?

# data[].attributes.body
Acids react with metal carbonates. Write a word equation for the reaction of calcium carbonate with hydrochloric acid

# data[].attributes.body
(a) List five different uses of energy in the human body
(b) Name the process that releases energy from food, so that body can use it
(c) Write a word equation for the process that you have named in b

# data[].attributes.body
(a) What is inspired air?
(b) What is expired air?
(c) List three differences between inspired air and expired air

# data[].attributes.body
(a) What is aerobic respiration?
(b) What is anaerobic respiration?
(c) List four differences between anaerobic and aerobic respiration.

# data[].attributes.body
(a) Explain what is meant by the term gas exchange
(b) Where is the gas exchange surface in humans?
(c) List three features of the human gas exchange surface that help it work efficiently

# data[].attributes.body
For each description, state whether it applies to aerobic respiration, to anaerobic respiration  or to both
(a) Lactic acid or alcohol made
(b) Energy released from glucose
(c) Carbon dioxide made
(d) Heat released

# data[].attributes.body
a) What is the purpose of respiration?
b) What is the energy released by respiration used for?
c) What is anaerobic respiration?
d) List three ways in which anaerobic respiration in human differs from anaerobic respiration

# data[].attributes.body
a) What is larynx
b) What is the function of cilia in the respiratory passages?
c) Where does gas exchange take place in a human?
d) What three adaptations of alveoli to ensure the efficiency of gas exchange?
e) State the function of goblet cells
f) How exercise can affect breathing?

# data[].attributes.body
1. Material may expand when heated. The expansion of solid materials can be a problem, but it can also be useful
a) Give one example of a situation where the expansion of a solid material can be a problem
b) Give one example of a situation where the expansion of a solid material can be made use of

# data[].attributes.body
2. Thermometers are used to measure temperature
a) Explain how a liquid - in - glass thermometer works
b) Every temperature scale must have at least two fixed points. What are the fixed points on the Celsius scale

# data[].attributes.body
3. Complete the sentence below writing solids, liquids and gases in the correct spaces

When materials are heated, as a rule ....................................expand more slowly than ...................................... and these expand more slowly than .........................................

# data[].attributes.body
1) State the factors that can increase the rate of reaction
2) Explain in term of collision theory if ;-
a) Temperature increases
b) Use catalyst
c) Use smaller size of particles
d) Use highly concentrated reactannt

# data[].attributes.body
1) Give two types of reactions
2) Describes the differences between endothermic and exothermic reactions

# data[].attributes.body
Q1: Answer the following question
a. What is stimuli?
b. Give two examples of effectors
c. Where are the cell bodies of each of these types of neurone found: i. Sensory neurone ii. Relay neurone iii. Motor neurone
d. Give two examples of voluntary actions
e Give two examples of involuntary actions
f. What is reflex actions?
g. Explain how reflex actions helps us when we touch something hot. You may include these words in your explaination : effector, electrical impulse, motor neurone, receptor, relay neurone, sensory neurone

# data[].attributes.body
Choose the term from the list that matches each of the descriptions. You may use each term once, more than once or not at all

Circular muscles   conjunctiva   contraction   cornea   effector  lens   motor neurone   radial muscles   receptor   relaxation   relay neurone   retina   sensory neurone  suspensory ligaments

a. A nerve cell that transmits impulses from the CNS to an effector
b. A cell that is sensitive to a stimulus
c. The part of the eye that refracts light rays most strongly
d. The part of the eye that contains receptor cells
e. The action of the ciliary muscle when the eye is focusing on a nearby object
f. The muscles in the iris that contract to reduce the amount of light entering the eye

# data[].attributes.body
a. Define homeostasis
b. Give two hormones that are secreted by pancreas
c. Describe the function of each hormone that you answer in (a)
d. Explain what happen if the blood glucose level increase
e. Explain what happen if blood glucose level decrease

# data[].attributes.body
a. Give a normal temperature of human
b. Explain how control of body temperature works, if the temperature is greater than normal body temperature
c. Explain how control of body temperature works, if the temperature is lower than normal body temperature

# data[].attributes.body
a. What part of the shoot is sensitive to light?
b. What part of the shoot responds to light?
c. How does the normal response of a shoot to light help the plant?
d. Explain what happen if the light spread evenly to plants
e. Explain what happen to the growth of plant if the light only reached the right side of plants.

# data[].attributes.body
What is the mass of 0.5 mol of copper(ii) sulfate crystals?

# data[].attributes.body
Calculate mass of one mole for C2H5OH. ( C= 12, H= 1, O =16)

# data[].attributes.body
1. When a force moves, it does work. Complete the following sentences, writing more or less in the spaces

a. When it moves, a bigger force does ........................... work than a smaller force

b. The greater the distance moved by the force, the ........................................... work it does.

# data[].attributes.body
Power tells us about how quickly work is done. Complete the following sentences writing work or energy in the spaces

a. Power is the rate at which ......................... is transferred

b. Power is the rate at which .........................is done

# data[].attributes.body
Omar and Ahmed are lifting weights in the gym. Each lifts a weight of 200N. Omar lifts the weight to a height of 2.0m, whereas Ahmed lifts it to a height of 2.1m. Who does more work in lifting the weight? Explain how you know. (HINTS: Find the force and distance then use the formula W= F x d)

# data[].attributes.body
Millie and Lilly are identical twins who enjoy swimming. Their arms and legs provide the force needed to move them through the water. Millie can swim 25m in 50s. Lily can swim 100m in 250 s.

a. Calculate the swimming speed of each twin
(use formula speed = distance / time taken)

b. Which twin has the greater power when swimming? Explain how you can tell

# data[].attributes.body
Two girls are estimating each other's power. One runs up some steps, and the other times her. Here are their results

Height of one step = 20 cm (need to convert in m because height consider as a distance)

Number of steps = 36

mass of runner  = 45kg

time taken = 4.2s

a. Calculate the runner's weight (Acceleration due to gravity g - 10m/s^2) use the formula W - mass x gravitational field strength )

b. Calculate the increase in g.p.e as she runs up the steps

c. Calculate the power. (Use the energy transferred that you get in c) - use the formula Power = Energy transferred / time taken

# data[].attributes.body
Question 1 :
What are chromosome made of?

# data[].attributes.body
What are homologous chromosomes?

# data[].attributes.body
What are alleles ?

# data[].attributes.body
a. The allele for brown eyes is dominant to the allele for blue eyes. Write down suitable symbols for these alleles.

b. What is the phenotype of a person who is heterozygous for this characteristic?

# data[].attributes.body
If a normal human cell has 46 chromosomes, how many chromosomes are there in a human sperm cell?

# data[].attributes.body
Using the symbols N for normal wings, and n for vestigial (very small wings) write down the following
a. genotype of a fly which is heterozygous for this characteristic
b. the possible genotypes of its gametes