Question 1

The wings of some airplanes are made from composite materials.

Accepted Answer

A) True 
 B)False

Question 2

The monomer used to make PVC is

Accepted Answer

A) H₂C  CH₂. 
B) Cl₂C  CH₂. 
C) H₂C  CHCl. 
D) F₂C  CF₂.

Question 3

Polychlorinated biphenyls (PCBs)have been banned because they are an environmental hazard.Which of the following was NOT a reason for banning them?

Accepted Answer

A) PCBs degrade slowly in nature. 
B) PCBs are nonpolar compounds and do not dissolve readily in water. 
C) PCBs have high electrical resistance and are excellent insulating materials. 
D) They lower the glass transition temperature, Tg, when they are added to a polymer.

Question 4

Monomers

Accepted Answer

A) are small building blocks of polymers. 
B) are small polymers. 
C) are ethylene. 
D) cannot form polymers.

Question 5

Plexiglass is

Accepted Answer

A) polyvinyl chloride. 
B) polymethyl methacrylate. 
C) polytetrafluoroethylene. 
D) polyvinyl acetate.

Question 6

HDPE finds applications in

Accepted Answer

A) waxed paper. 
B) threaded bottle caps. 
C) baggies. 
D) cans.

Question 7

What is polymerization?

Accepted Answer

The answer of What is polymerization?...

Question 8

Lycra bicycle shorts and exercise clothing contain fibers that have great strength and rigidity as well as the ability to stretch.These fibers are probably composed of

Accepted Answer

A) natural rubber. 
B) amorphous polymers. 
C) crystalline polymers. 
D) a creative combination of amorphous and crystalline polymers.

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

The polymer segment ~CH₂CH₂CH₂CH₂CH₂CH₂CH₂~ represents

Accepted Answer

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

Question 11

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.

Question 12

What type of polymer is used for silly putty?

Accepted Answer

The answer of What type of polymer is used for...

Question 13

The monomer of polypropylene is

Accepted Answer

A) CH₂  CH₂. 
B) CH₂  CH-CH₃. 
C) CH₃CH₃. 
D) CH₃CH₂CH₃.

Question 14

Chewing gum is easier to remove from clothing if ice is applied to the gum.This works because applying ice lowers the temperature of the gum to below its glass transition temperature (Tg),so the gum becomes brittle and can be removed more easily.

Accepted Answer

A) True 
 B)False

Question 15

Vulcanization makes rubber

Accepted Answer

A) hard. 
B) sticky. 
C) soft. 
D) less elastic.

Question 16

Compare and contrast the molecular structure and performance characteristics of LDPE and HDPE.

Accepted Answer

The answer of Compare and contrast the molecular structure and...

Question 17

How are polymers linked to the earth's petroleum reserves?

Accepted Answer

The answer of How are polymers linked to the earth's...

Question 18

LDPE finds applications as

Accepted Answer

A) plastic film. 
B) threaded bottle caps. 
C) drain pipes. 
D) plastic television trays.

Question 19

The temperature in many parts of the world can range between 0°C and 40°C,therefore we want the Tg of car tires to be

Accepted Answer

A) greater than 40°C. 
B) less than 40°C but greater than 0°C. 
C) exactly 0°C. 
D) less than 0°C.

Question 20

The most commonly recycled plastics are

Accepted Answer

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

Exam 10: Polymers

The wings of some airplanes are made from composite materials.

The monomer used to make PVC is

Polychlorinated biphenyls (PCBs) have been banned because they are an environmental hazard.Which of the following was NOT a reason for banning them?

Monomers

Plexiglass is

HDPE finds applications in

What is polymerization?

Lycra bicycle shorts and exercise clothing contain fibers that have great strength and rigidity as well as the ability to stretch.These fibers are probably composed of

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

The polymer segment ~CH₂CH₂CH₂CH₂CH₂CH₂CH₂~ represents

Low-density polyethylene is composed of

What type of polymer is used for silly putty?

The monomer of polypropylene is

Chewing gum is easier to remove from clothing if ice is applied to the gum.This works because applying ice lowers the temperature of the gum to below its glass transition temperature (Tg),so the gum becomes brittle and can be removed more easily.

Vulcanization makes rubber

Compare and contrast the molecular structure and performance characteristics of LDPE and HDPE.

How are polymers linked to the earth's petroleum reserves?

LDPE finds applications as

The temperature in many parts of the world can range between 0°C and 40°C,therefore we want the Tg of car tires to be

The most commonly recycled plastics are