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Q-19
Answer A
because +33.2kJ is the value  fir change in H

Q- 9
Answer A
because  the colored compounds have different molecules and different electronegativity
Q- 24
Answer C
because A and B are compounds and D is an element.
Q-5
Answer C
because Group 17 had the highest electronegativity numbers.
Q-16
Answer A
because Ion A has 2 more electrons than protons.

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Dajour 1a

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Q-2
Answer C
The Fraction must be part over whole. 25 is part and 200 is the whole

Q-7
idk the answer

Q- 12
Answer B
In the beginning of the year you gave us a chart that had the protons, neutrons, and electron charges and mass totals.

Q-15
Answer A
Sulfur is not a metalloid, neither is Mercury, and neither is Iodine, so the only possible answer is A.

Q-24
Answer C
Oxygen has the highest electro-negativity out of the other choices.

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Dajour (Worksheet 1a)
Q1- A
Q3- D
Q5- C
Q8- D
Q9- B
Q10- D
Q14- C
Q15- B
Q17- B
Q18- B
Q20- C
Q23- D
Q25- B

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1:A when oxygen touches iron it becomes rusty.
2:B
3:D
8:A
9:A
10:A
13:B
15:D
17:B Fluorine is more active then hydrogen.
18:D
19:A
22:C
25:D

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Q-5
Answer C
It requires less energy to be a gas, so the molecules are more free flowing than a liquid.

Q-17
Answer A
Ammonia is a compound which means it can be broken apart to form two separate elements.

Q-18
Answer B
They both contain Oxygen and Hydrogen but one has 2 molecules of Oxygen while the other one has 1 molecule of Oxygen.

Q-23
Answer B
Thermal, Chemical and Electromagneare all forms of energy which would mean that is the only right choice.

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Dajour (Worksheet 1b)
Q3- B
Q4- C
Q7- B
Q8- A
Q10- D
Q11- A
Q16- C
Q17- 38
Q18- Increasing surface area means more of the hot carbon allows for a quicker reaction
Q19- When dynamic equilibrium is reached, the elements on both ends of the equation will be constant
Q20- C
Q21- D
Q24- A

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Q-4

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1)A- a chemical property of iron is that it oxidizes
3)D- I- has a radius of 136pm which is largest out of all choices
4)B-Carbon monoxide & Carbon dioxide has same chemical properties, different physical properties
5)C- has the highest  Electronegativities
6)A- isn’t a mixture
7)C- on the graph it ends up around the area of 83kPa
8)A- the charge distribution is symmetrical & the molecule is non polar
10)A- a ideal gas has random straight- line motion & no attractive forces
12)C- Collide with proper energy & proper orientation
13)B- systems in nature tend to undergo changes through lower energy and higher entropy
15)C- spectra represents energy released as an electron moves from a lower energy state to a higher energy state.
17)B- fluorine has hugest polarity, can tell this by subtracting the electronegativity of hydrogen and fluorine
24)C- The image shows a mixture

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5 is C because entropy increases when phase transitions are towards higher internal energy like melting or boiling.

6 is Kr because you can see it in the Periodic Table.

9 is 10 neutrons for Ne-20 and 12 neutrons for Ne-22. To find neutrons of an isotope find the difference between its atomic mass and mass number. (Ne-20 is 20-10 which is 10 neutrons and Ne-22 is 22-10 which is 12 neutrons)

10 is D because the definition of the wave mechanical model is the probable location of an electron.

12 is B because electrons and positrons have a mass of 0.

13 is D because electrons were discovered in 1897 by J.J. Thompson using cathode ray tubes.

15 is A because you can see it on the Periodic Table.

17 is A because B-D are elements and therefore can NOT be broken down further.

18 is B because mixtures can't have atomic bonds so it is nor C nor D. And since different compounds must have different properties it is B.

19 is D because nuclear is not a major category, so it can't be A or C. And it's not B because it would be ionic and covalent not ionic and empirical.

20 is D because when you draw the Lewis Dot Structure for NH3 is asymmetrical.

24 is C because electronegativity increases as you go right and decreases as you go down, since oxygen is closest to the top right it must have the highest electronegativity.

25 is D because gases are closest to ideal when temperatures are high and pressure is low, and D has the BEST combination of both.