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CHEM 102 Winter 18 Make-up Exam (B) Questions and Answers,100% CORRECT $15.49   Add to cart
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CHEM 102 Winter 18 Make-up Exam (B) Questions and Answers,100% CORRECT
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CHEM 102 Winter 18 Make-up Exam (B) Questions and Answers Potentially useful data: x  pH  pKa 2 a  log base acid  ΔG° = ΔH° – T ΔS° ΔG = ΔG° + RT ln Q ΔG° = – RT ln K R = 8.314 J mol-1 K-1 1. Please choose the letter “B” as y...

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  • February 22, 2023
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  • 2022/2023
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CHEM 102 Winter 18 Make-up Exam (B) Questions and Answers


Potentially useful data:


x  b b 2  4 ac
2a
pH  base

pKa log
acid 
ΔG° = ΔH° – T ΔS°
ΔG = ΔG° + RT ln
Q ΔG° = – RT ln K
-1 -1
R = 8.314 J mol K


1. Please choose the letter “B” as your answer for this question.


2. Which of the following reactions has a negative S°?
a) 2 H2 (g) + O2 (g)  2 H2O (g)
b) BaF2 (s)  Ba2+ (aq) + 2 F (aq)
c) CH3OH (aq)  CH3OH (l)
d) All of the above.
e) Both a) and c).

3. Rank the following substances in order of decreasing (that is, from highest to lowest) standard molar entropy.
N2O4(g) NO(g) NO2(g)
a) N2O4(g) > NO(g) > NO2(g)
b) NO(g) > NO2(g) > N2O4(g)
c) N2O4(g) > NO2(g) > NO(g)
d) NO (g) > N2O4(g) > NO2(g)
e) Since they are all gases, all have the same entropy.




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, 4. Under which conditions is a chemical reaction non-spontaneous at all temperatures?
a) S° > 0, H° > 0
b) S° < 0, H° > 0
c) S° < 0, H° < 0
d) S° > 0, H° < 0
e) Such a reaction does not exist.


-
5. Which of the following MUST be true in a buffer solution in which [A ] > [HA]?
a) pH > pKa
b) pH = pKa
c) pH < pKa
d) pH < 7.00
e) pH > 7.00


6. Which equation could be used to calculate the molar solubility, S, of Fe(OH)2?
2
a) Ksp = 2 S
2
b) Ksp = S
3
c) Ksp = S
3
d) Ksp = 4 S
3
e) Ksp = 2 S

-10
7. Calculate the pH of a solution made by mixing 250.0 mL of 0.150 M NH4Cl (Ka = 5.6 × 10 )
with 100.0 mL of 0.200 M NH3.

a) 9.13
b) 8.98
c) 9.53
d) 4.74
e) 9.25




Page 2 of 7

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