chem 102 winter 19 final exam a questions and answers
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CHEM 102 Winter 19
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CHEM 102 Winter 19 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 ∆G° = ∆H° – T ∆S°
ln[A]t = – kt + ln[A]o ∆G = ∆G° + RT ln Q
1/[A]t = kt +1/[A]o ∆G° = – RT ln K
First order half-life: t1/2 = ln2 / k ∆G° = – nFE°
pH RT
log E E ln Q
pKa nF
base
acid
-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. Which of the following substances can be used as a monomer for addition polymerization?
a) H2C=CHBr
b) H2C=C-CH=O
c) H3C-CH2-CH3
d) HCŁC-CH2-CH3
e) all except c)
3. 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) both a) and c)
e) All of the above.
4. How many C-H bonds are present in a molecule of cyclohexane?
a) 8
b) 10
c) 12
d) 14
,e) 16
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, 5. Which is the correct name for the following compound?
a) 3-methyl-2-pentene
b) 2-ethylbutane
c) 2-ethyl-2-butene
d) 3-methyl-3-pentene
e) 3-methylpentane
6. What would be a correct expression of the overall reaction rate for the production of
ammonia?
N2 (g) + 3 H2 (g) → 2 NH3 (g)
a) rate = + 2∆[NH3]/∆t
b) rate = - 3∆[H2]/∆t
c) rate = + 2/3 ∆[NH3]/∆t
d) rate = - 1/2 ∆[N2]/∆t
e) rate = - 1/3 ∆[H2]/∆t
–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
8. Which substance exhibits ONLY London dispersion intermolecular forces between its
molecules?
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