chem 102 winter 19 final exam c questions and answers
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CHEM 102 Winter 19 Final Exam (C) 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 “C” 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) HC≡C-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) 16
d) 14
e) 12
Page 1 of 13
,5. Which is the correct name for the following compound?
a) 2-ethylbutane
b) 3-methyl-2-pentene
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 = + 2Δ[NH3]/Δt
b) rate = - 3Δ[H2]/Δt
c) rate = - 1/3 Δ[H2]/Δt
d) rate = - 1/2 Δ[N2]/Δt
e) rate = + 2/3 Δ[NH3]/Δt
–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) 2.6 × 10 M
–4
b) 1.1 × 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?
a) HF
b) OF2
c) PF3
d) SiCl4
e) CH3Cl
Page 2 of 13
, 9. Which statement is FALSE about a compound A that has the structure below?
CH3
H
H 3C C CH2
C
H CH
CH3
a) The addition of two hydrogen atoms to compound A would convert this compound into an alkyne.
b) Compound A is unsaturated.
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) Methylcyclohexane is a structural isomer of compound A.
10. Determine the molar solubility of Al(OH)3 in a solution containing 0.05 M AlCl3.
-33
Ksp for Al(OH)3 is 1.3 × 10 .
-9
a) 2.6 × 10 M
-12
b) 9.9 × 10 M
-31
c) 5.2 × 10 M
-29
d) 1.04 × 10 M
-35
e) 6.5 × 10 M
11. Which class of compounds below could be associated with geometric isomers?
a) alkylbenzenes
b) alkynes
c) alkenes
d) alkyl ethers
e) alkanes
12. The cell notation for a voltaic cell constructed with copper and silver is shown below.
Cu (s) | Cu2+ (aq) || Ag+ (aq) | Ag (s)
Which process occurs at the cathode?
a) Cu (s) Cu2+ (aq) + 2e–
b) Cu2+ (aq) + 2e– Cu (s)
c) Ag (s) Ag+ (aq) + e–
d) Ag+ (aq) + e– Ag (s)
e) Cu (s) + 2 Ag+ (aq) Cu2+ (aq) + 2 Ag (s)
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