Download CHEM 102 EXAM 1 WINTER 07-08

CHEM 102 Winter 08 Exam 1
On the answer sheet (scantron) write your Name, Student ID Number, and Recitation Section
Number. Choose the best (most correct) answer for each question AND ENTER IT ON YOUR
ANSWER SHEET.
1. Which compound is incorrectly named?
a. C8H18 octane
b. C6H12 hexane
c. C5H10 pentene
d. C4H6 butyne
ANSWER: b
2. The compound 2,2,3,4-tetramethylpentane is an isomer of:
a. hexane
b. heptane
c. octane
d. nonane
ANSWER: d
3. Which statement about hydrocarbons is false?
a. Hydrocarbons can be straight-chain alkanes or branched-chain alkanes.
b. Methane is the simplest hydrocarbon.
c. Unsaturated hydrocarbons contain only C-H and C-C single covalent bonds.
d. Hydrocarbons can contain carbon atoms joined in a ring.
ANSWER: c
4. Assume all hydrocarbons given are linear. Which compound will not contain a multiple
bond?
a. C2H4
b. C3H4
c. C6H14
d. C8H16
ANSWER: c
5. What is the correct name for the following molecule?
Cl O
CH3CH2CHCOCH2CH3
a. chloropropyl ethanoate
b. 2-chloro-1-ethyl butanoic acid
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c. ethyl-3-chlorobutanoate
d. ethyl-2-chlorobutanoate
ANSWER: d
6. Which compound below has cis and trans isomers?
a. (CH3)HC=CH2
b. CH3ClC=CBrCH3
c. CH3CH2OH
d. (CH3)2C=CCl2
ANSWER: b
7. Branched chain hydrocarbons are preferred for use in automobile fuels because
a. branched-chain hydrocarbons are collected directly as one of the fractions during
distillation of crude oil.
b. branched-chain hydrocarbons are more thermally stable and burn more smoothly than
straight-chain hydrocarbons.
c. branched-chain hydrocarbons have a lower octane number than straight-chain
hydrocarbons.
d. branched-chain hydrocarbons can easily be converted to straight-chain hydrocarbons by
catalytic cracking.
ANSWER: b
8. Which of the following molecules is chiral?
a. propene
b. 1-bromo-1-chloro-1-fluoro ethane
c. chlorofluoromethane
d. 2-hydroxy-2-methyl butane
ANSWER: b
9. How many different secondary alcohols can be made from the addition of one hydroxy group
to the carbon skeleton shown below? Consider only structural isomers.
a. 1
C
b. 2
c. 3
C
C
C
C
C
d. 4
ANSWER: a
C
10. Esters are produced by a process that can be characterized as
a. a hydrolysis reaction.
b. a condensation reaction.
c. the reaction of alcohols with carboxylic acids.
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d. both b and c above
ANSWER: d
11. Monomers used to produce addition polymers usually contain ___ in their molecular
structure.
a. sulfur atoms
b. double bonds
c. branched carbon chains
d. two or more different functional groups
ANSWER: b
12. Which of the following compounds has the lowest boiling point?
a. H2O
b. CH3Cl
c. O2
d. CH3CH2CH2CH2CH3
ANSWER: c
13. A polyamide could be produced from which of the following monomers?
O
O
a.
HO C
(CH2)4
C OH
+
H2N
(CH2)4
NH2
H O
H2N C C OH
b.
CH3
O H
c.
CH3CH2C N CH2CH2CH3
d. either a or b above.
ANSWER: d
14. Volatility is the
a. temperature at which the equilibrium vapor pressure of a liquid is exactly equal to the
atmospheric pressure.
b. odor of a substance.
c. tendency of molecules of a gas to move closer together when the pressure is increased.
d. tendency of a liquid to vaporize.
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ANSWER: d
15. The temperature at point a is the
a. critical point.
b. triple point.
c. normal freezing point.
d. normal boiling point.
ANSWER: c
16. Boiling a liquid means
a. a dynamic equilibrium exists between the liquid and vapor phase.
b. the vapor pressure of the liquid equals the external pressure above the liquid surface.
c. the molecular bonds in the liquid are broken rapidly.
d. the vapor pressure of the liquid is less than the external pressure above the liquid surface.
ANSWER: b
17. A positive slope for a region of a curve of temperature vs. energy added indicates that
___________ in that region.
a. no energy is being absorbed by the system
b. energy is being given off by the system, but it cannot be measured
c. energy is being absorbed by the system and is being used for a phase change
d. energy is being absorbed by the system and is being used to increase the temperature
ANSWER: d
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18. At a constant pressure of 1 atmosphere, the transition from Phase III to Phase II is
a. an exothermic process in which solid molecules lose energy.
b. an exothermic process in which gas molecules lose energy.
c. an endothermic process in which liquid molecules gain energy.
d. an endothermic process in which gas molecules gain energy.
ANSWER: b
19. In an ionic compound, such as NaCl, which consists of a face-centered cubic lattice of
chloride ions, each sodium ion has ___ chloride ions surrounding it as nearest neighbors.
a. 8
b. 6
c. 4
d. 1
ANSWER: b
20. In a ________semiconductor the charge carriers are the holes because __________.
a. n-type; there are extra electrons that move freely
b. n-type; they are not locked into one location
c. p-type; electrons move to fill a hole, thus leaving a hole elsewhere
d. p-type; there are extra electrons that can move freely
ANSWER: c
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