chem 102 winter 18 final exam a questions and answers
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CHEM 102 Winter 18 Final Exam (A) Questions and Answers
Potentially useful data:
b b 2 4 ac
x 1 atm = 760 torr = 760 mm Hg
2a
[A]t = – kt + [A]o ΔG° = ΔH° – T ΔS°
ln[A]t = – kt + ln[A]o ΔG = ΔG° + RT ln Q
1/[A]t = kt +1/[A]o ΔG° = – RT ln K
First order half-life: t1/2 = ln2 / k ΔG° = – nFE°
pH RT
pKa
log
base E E ln Q
acid nF
-1 -1 -
R = 8.314 J mol K F = 96500 C/mol e
1. Please choose the letter “A” as your answer for this question.
2. How many hydrogen atoms would be present in methylbenzene?
a) 6
b) 8
c) 10
d) 12
e) 14
o
3. Which of the following solids has the highest standard entropy at 25 C?
a) LiF
b) LiI
c) LiCl
d) LiBr
e) All have the same standard entropy.
Page 1 of 14
,4. Which of the following would dissolve CuI(s) the most?
a) 0.6 M MgI2(aq)
b) distilled water
c) 0.1 M CuNO3(aq)
d) 1 M NaI(aq)
e) 0.1 M NaI(aq)
5. Consider a buffer solution of a weak acid, HA. When will the buffer be most effective in keeping the pH
around a certain value?
a) [A- ] = [HA]
b) [HA] = [H3O+]
c) [H3O+] = [OH-]
d) [OH-] = [HA]
e) [H3O+] = [HA]/[A- ]
6. Determine the reaction rate with respect to [H2] in the ammonia formation:
N2 (g) + 3 H2 (g) → 2 NH3 (g)
a) rate = + 3Δ[H2]/Δt
b) rate = - 3Δ[H2]/Δt
c) rate = + 1/3 Δ[H2]/Δt
d) rate = - 1/3 Δ[H2]/Δt
e) Not enough info to determine.
+ –4
7. Estimate the [H3O ] in a buffer that consists of 0.30 M HCOOH (Ka = 1.7 × 10 ) and 0.20 M HCOONa.
–4
a) 1.1 × 10 M
–4
b) 2.6 × 10 M
–4
c) 4.3 × 10 M
–5
d) 6.7 × 10 M
–5
e) 7.6 × 10 M
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, 8. Which substance exhibits ONLY London dispersion intermolecular forces between its molecules?
a) HF
b) SiCl4
c) PF3
d) OF2
e) CH3Cl
Use the chemical structure A given below to answer questions 9 and 10:
CH3
H
H 3C C CH2
C
H CH
CH3
A
9. What is the correct name of compound A?
a) 4,5-dimethylpentane
b) 4,5-dimethyl-2-pentene
c) 3-methyl-4-hexene
d) 4-methyl-2-hexene
e) 2-methyl-3-pentene
10. Which statement is FALSE about compound A?
a) Methylcyclohexane is a structural isomer of compound A.
b) Compound A can be used as a monomer for addition polymerization.
c) Compound A is a hydrocarbon.
d) There are two possible, distinct 3-D orientations of the C-H bonds around the C=C bond.
e) The addition of two hydrogen atoms to compound A would convert this compound into an alkyne.
Page 3 of 14
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