Question 1

The polymer segment ~CH₂CH₂CH₂CH₂CH₂CH₂CH₂~ represents

Accepted Answer

A)  polyethylene.
B)  polypropylene.
C)  polystyrene.
D)  polyvinyl chloride.E) A) and D)
F) B) and D)

Question 2

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.E) None of the above
F) A) and B)

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.E) B) and C)
F) A) and B)

Question 4

What type of polymer is used for silly putty?

Accepted Answer

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

Question 5

The monomer of polypropylene is

Accepted Answer

A)  CH₂  CH₂.
B)  CH₂  CH-CH₃.
C)  CH₃CH₃.
D)  CH₃CH₂CH₃.E) None of the above
F) A) and B)

Question 6

LDPE finds applications as

Accepted Answer

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

Question 7

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

Accepted Answer

LDPE (Low-Density Polyethylene) and HDPE...

Question 8

What is polymerization?

Accepted Answer

the proces...

Question 9

Vulcanization makes rubber

Accepted Answer

A)  hard.
B)  sticky.
C)  soft.
D)  less elastic.E) None of the above
F) All of the above

Question 10

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.E) A) and B)
F) A) and C)

Question 11

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.E) B) and C)
F) None of the above

Question 12

The monomer used to make PVC is

Accepted Answer

A)  H₂C  CH₂.
B)  Cl₂C  CH₂.
C)  H₂C  CHCl.
D)  F₂C  CF₂.E) A) and B)
F) None of the above

Question 13

The wings of some airplanes are made from composite materials.

Accepted Answer

A) True 
 B)False

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

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

Accepted Answer

Polymers are large, complex molecules ma...

Question 16

Monomers

Accepted Answer

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

Question 17

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

Accepted Answer

A) True 
 B)False

Question 18

The most commonly recycled plastics are

Accepted Answer

A)  HDPE and PET.
B)  PET and PS.
C)  HDPEand PS.
D)  PET and styrene-butadiene.E) None of the above
F) C) and D)

Question 19

HDPE finds applications in

Accepted Answer

A)  waxed paper.
B)  threaded bottle caps.
C)  baggies.
D)  cans.E) All of the above
F) C) and D)

Question 20

Plexiglass is

Accepted Answer

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

Exam 10: Polymers

Monomers

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The most commonly recycled plastics are

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What type of polymer is used for silly putty?

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The monomer used to make PVC is

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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.

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The monomer of polypropylene is

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The wings of some airplanes are made from composite materials.

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What is polymerization?

Correct Answerverifiedthe proces...View AnswerShow Answer

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

Correct AnswerAnswered by ExamLex AIPolymers are large, complex molecules ma...View AnswerShow Answer

HDPE finds applications in

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Low-density polyethylene is composed of

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

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Vulcanization makes rubber

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The polymer segment ~CH₂CH₂CH₂CH₂CH₂CH₂CH₂~ represents

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerAnswered by ExamLex AILDPE (Low-Density Polyethylene) and HDPE...View AnswerShow Answer

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

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LDPE finds applications as

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Plexiglass is

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the proces...
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Polymers are large, complex molecules ma...
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Answered by ExamLex AI
LDPE (Low-Density Polyethylene) and HDPE...
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