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1. When two or more atoms combine, the resulting structure is known as a(n) ____.
a.
isomer
b.
molecule
c.
isotope
d.
polymer
ANSWER:
b
2. Which type of chemical bonding is most important in plastics?
a.
metallic
b.
ionic
c.
hydrogen
d.
covalent
ANSWER:
d
3. When hydrocarbon molecules have only single covalent bonds, they are considered ____.
a.
saturated
b.
hydrolyzed
c.
monounsaturated
d.
polyunsaturated
ANSWER:
a
4. Unsaturated molecules contain some ____ bonds.
a.
hydrogen
b.
metallic
c.
double
d.
ionic
ANSWER:
c
5. Which saturated hydrocarbons molecule contains three carbon atoms?
a.
butane
b.
propane
c.
methane
d.
octane
ANSWER:
b
6. As the number of carbons in the backbone of a hydrocarbon increases, the molecules get longer and longer and the
substance is most likely to be a ____.
a.
solid
b.
gas
c.
liquid
d.
vapor
ANSWER:
a
7. The joining together of many mers is known as ____.
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a.
a homopolymer
b.
paraffin
c.
ethane
d.
polymerization
ANSWER:
d
8. Plastics always contain the element ____.
a.
carbon
b.
silicon
c.
oxygen
d.
nitrogen
ANSWER:
a
9. In an amorphous molecular structure of plastic, the appearance of the plastic will always be ____.
a.
reflective
b.
opaque
c.
transparent
d.
translucent
ANSWER:
c
10. In PVC, a ____ atom replaces one hydrogen atom per mer.
a.
sodium
b.
sulfur
c.
bromine
d.
chlorine
ANSWER:
d
11. An intermolecular interaction in which molecules or portions of molecules exhibit polarity is known as a(n) ____.
a.
Van der Waals force
b.
dipole interaction
c.
hydrogen bond
d.
ionic bond
ANSWER:
b
12. Which combination of atoms represents a permanent dipole?
a.
a carbon-fluorine single bond
b.
a carbon-fluorine double bond
c.
a nitrogen-hydrogen single bond
d.
a carbon-OH single bond
ANSWER:
a
13. When crystalline plastics are melted, the crystalline regions unfold, and the entire structure becomes ____.
a.
annealed
b.
polarized
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c.
amorphous
d.
uniaxial
ANSWER:
c
14. The process of ____ usually involves applying controlled heating of parts of plastics.
a.
orientation
b.
crystallization
c.
uncoiling
d.
annealing
ANSWER:
d
15. An example of a plastics product that shows orientation in its stretch differences, stretching easily in the crosswise
direction, but not so readily lengthwise is ____.
a.
PVC
b.
teflon tape
c.
duct tape
d.
Shrinky-Dinks®
ANSWER:
b
16. An example of a plastics product that shows a biaxial orientation in that it will stretch in two directions if heated is
____.
a.
PVC
b.
teflon tape
c.
a pop bottle
d.
thin film labels
ANSWER:
c
17. Plastics that consist of disconnected hydrocarbon chains are called ____.
a.
biaxial plastics
b.
cross links
c.
thermosets
d.
thermoplastics
ANSWER:
d
18. Rigid thermosets often find applications in ____ environments.
a.
high-heat
b.
moist
c.
frigid
d.
extremely dry
ANSWER:
a
19. Examples of a flexible thermosets is/are ____.
a.
hydrofoils
b.
automobile hoods
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c.
safety glass
d.
foams for car seats
ANSWER:
d
20. This configuration is of the hydrocarbon, ____.
a.
methane
b.
pentane
c.
octane
d.
hexane
ANSWER:
c
21. Which molecule is a solid?
a.
polethylene
b.
methane
c.
ethane
d.
pentane
ANSWER:
a
22. How many carbon atoms does decane have?
a.
2
b.
5
c.
8
d.
10
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ANSWER:
d
23. A benzene molecule has the shape of a ____.
a.
straight chain
b.
ring
c.
kinked chain
d.
crystal
ANSWER:
b