Question 1

Which of the following is currently the most desirable method to minimize the problem of disposal of plastics?

Accepted Answer

A)  Deposit them in a landfill. 
B)  Incinerate them. 
C)  Recycle them. 
D)  Use biodegradable plastics. 
A)  Deposit them in a landfill. 
B)  Incinerate them. 
C)  Recycle them. 
D)  Use biodegradable plastics.

Question 2

One of the disadvantages of polybutadiene rubber for automobile tires is

Accepted Answer

A)  poor resistance to gasoline and oils. 
B)  its color. 
C)  density. 
D)  expense. 
A)  poor resistance to gasoline and oils. 
B)  its color. 
C)  density. 
D)  expense.

Question 3

This formula in which n can be a very large number represents which of the following polymers?

Accepted Answer

A)  polyethylene 
B)  polyvinyl chloride 
C)  polypropylene 
D)  polystyrene 
A)  polyethylene 
B)  polyvinyl chloride 
C)  polypropylene 
D)  polystyrene

Question 4

The pendant group in polypropylene is a(n)

Accepted Answer

A)  benzene ring. 
B)  chlorine atom. 
C)  ethyl group. 
D)  methyl group. 
A)  benzene ring. 
B)  chlorine atom. 
C)  ethyl group. 
D)  methyl group.

Question 5

A plasticizer makes a material more flexible and less brittle by raising its glass transition temperature (Tg).

Accepted Answer

A) True 
 B)False

Question 6

Amorphous polymers are composed of

Accepted Answer

A)  randomly organized polymer chains. 
B)  highly organized polymer chains. 
C)  a mixture of random and highly organized polymer chains. 
D)  one monomer. 
A)  randomly organized polymer chains. 
B)  highly organized polymer chains. 
C)  a mixture of random and highly organized polymer chains. 
D)  one monomer.

Question 7

The most commonly recycled plastics are

Accepted Answer

A)  HDPE and PET. 
B)  PET and PS. 
C)  HDPEand PS. 
D)  PET and styrene-butadiene. 
A)  HDPE and PET. 
B)  PET and PS. 
C)  HDPEand PS. 
D)  PET and styrene-butadiene.

Question 8

Which of the following statements about the difference between HDPE and LDPE is NOT correct?

Accepted Answer

A)  HDPE has a higher density than LDPE does. 
B)  HDPE holds its shape better than LDPE does when they are put into boiling water. 
C)  HDPE is more flexible than LDPE is. 
D)  HDPE has fewer side chains branching off from the main chains than LDPE does. 
A)  HDPE has a higher density than LDPE does. 
B)  HDPE holds its shape better than LDPE does when they are put into boiling water. 
C)  HDPE is more flexible than LDPE is. 
D)  HDPE has fewer side chains branching off from the main chains than LDPE does.

Question 9

Crystalline polymers tend to have great strength while amorphous polymers tend to have greater elasticity.

Accepted Answer

A) True 
 B)False

Question 10

Flame-retardant fabrics often have ________ atoms incorporated into the fabric's fibers.

Accepted Answer

A)  Br or O 
B)  Cr or Br 
C)  Br or Cl 
D)  F or Br 
A)  Br or O 
B)  Cr or Br 
C)  Br or Cl 
D)  F or Br

Question 11

All of the following statements about biodegradable polymers are true EXCEPT

Accepted Answer

A)  some can biodegrade by composting. 
B)  the most sustainable approach is to use renewable resources, especially non-food crops, as a monomer source. 
C)  their glass transition temperatures are very high. 
D)  many require microorganisms to degrade them. 
A)  some can biodegrade by composting. 
B)  the most sustainable approach is to use renewable resources, especially non-food crops, as a monomer source. 
C)  their glass transition temperatures are very high. 
D)  many require microorganisms to degrade them.

Question 12

Approximately 50% of the plastic currently used in the United States is recycled each year.

Accepted Answer

A) True 
 B)False

Question 13

Elastomers are synthetic polymers that mimic the properties of

Accepted Answer

A)  vulcanized rubber. 
B)  polyethylene. 
C)  celluloid. 
D)  PVC. 
A)  vulcanized rubber. 
B)  polyethylene. 
C)  celluloid. 
D)  PVC.

Question 14

Which of the following is a problem with the use of plastics?

Accepted Answer

A)  They have a low density. 
B)  They can conduct electricity. 
C)  They are made from petroleum and natural gas. 
D)  They can be made from renewable plant resource. 
A)  They have a low density. 
B)  They can conduct electricity. 
C)  They are made from petroleum and natural gas. 
D)  They can be made from renewable plant resource.

Question 15

This formula in which n can be a very large number represents which of the following polymers?

Accepted Answer

A)  polyethylene 
B)  polyvinyl chloride 
C)  polypropylene 
D)  teflon 
A)  polyethylene 
B)  polyvinyl chloride 
C)  polypropylene 
D)  teflon

Question 16

Low-density polyethylene is composed of

Accepted Answer

A)  primarily linear, unbranched chains of polyethylene in a close packing arrangement. 
B)  primarily highly branched, non-linear chains of polyethylene in a diffuse packing arrangement. 
C)  a mixture of polyethylene and polystyrene. 
D)  polyethylene with low density plasticizers added to increase density. 
A)  primarily linear, unbranched chains of polyethylene in a close packing arrangement. 
B)  primarily highly branched, non-linear chains of polyethylene in a diffuse packing arrangement. 
C)  a mixture of polyethylene and polystyrene. 
D)  polyethylene with low density plasticizers added to increase density.

Question 17

The temperature inside the mouth is about 37°C. Polyvinyl acetate, a polymer used in chewing gum, has a Tg

Accepted Answer

A)  above 37°C. 
B)  below 37°C. 
C)  exactly 37°C. 
D)  above 100°C. 
A)  above 37°C. 
B)  below 37°C. 
C)  exactly 37°C. 
D)  above 100°C.

Question 18

Silicons are NOT used for

Accepted Answer

A)  lubricants. 
B)  garbage bags. 
C)  hydraulic fluids. 
D)  shoe polish. 
A)  lubricants. 
B)  garbage bags. 
C)  hydraulic fluids. 
D)  shoe polish.

Question 19

Plexiglas is a polymethyl methacrylate polymer that is used as a glass substitute. The Tg of Plexiglas is

Accepted Answer

A)  low. 
B)  high. 
C)  moderate. 
D)  not important. 
A)  low. 
B)  high. 
C)  moderate. 
D)  not important.

Question 20

What is polymerization?

Accepted Answer

the proces

Exam 10: Polymers

Which of the following is currently the most desirable method to minimize the problem of disposal of plastics?

One of the disadvantages of polybutadiene rubber for automobile tires is

This formula in which n can be a very large number represents which of the following polymers?

The pendant group in polypropylene is a(n)

A plasticizer makes a material more flexible and less brittle by raising its glass transition temperature (Tg).

Amorphous polymers are composed of

The most commonly recycled plastics are

Which of the following statements about the difference between HDPE and LDPE is NOT correct?

Crystalline polymers tend to have great strength while amorphous polymers tend to have greater elasticity.

Flame-retardant fabrics often have ________ atoms incorporated into the fabric's fibers.

All of the following statements about biodegradable polymers are true EXCEPT

Approximately 50% of the plastic currently used in the United States is recycled each year.

Elastomers are synthetic polymers that mimic the properties of

Which of the following is a problem with the use of plastics?

This formula in which n can be a very large number represents which of the following polymers?

Low-density polyethylene is composed of

The temperature inside the mouth is about 37°C. Polyvinyl acetate, a polymer used in chewing gum, has a Tg

Silicons are NOT used for

Plexiglas is a polymethyl methacrylate polymer that is used as a glass substitute. The Tg of Plexiglas is

What is polymerization?

Chemistry

Atoms

Atomic Structure

Chemical Bonds

Chemical Accounting

Gases, Liquids, Solids, and Intermolecular Forces

Acids and Bases

Oxidation and Reduction

Organic Chemistry

Nuclear Chemistry

Chemistry of the Earth

Air

Water

Energy

Biochemistry

Food

Drugs

Fitness and Health

Chemistry Down on the Farm

Household Chemicals

Poisons

Filters

A plasticizer makes a material more flexible and less brittle by raising its glass transition temperature (T_g).

The temperature inside the mouth is about 37°C. Polyvinyl acetate, a polymer used in chewing gum, has a T_g

Plexiglas is a polymethyl methacrylate polymer that is used as a glass substitute. The T_g of Plexiglas is