Question 1

Which of the following statements about crystalline and amorphous polymers is correct?

Accepted Answer

A) Crystalline polymers tend to be stronger, while amorphous polymers tend to have great elasticity. 
B) Crystalline polymers tend to have greater elasticity, while amorphous polymers tend to be stronger. 
C) Both crystalline and amorphous polymers are strong but have little elasticity. 
D) Both crystalline and amorphous polymers have great elasticity but have little strength. 
A) Crystalline polymers tend to be stronger, while amorphous polymers tend to have great elasticity. 
B) Crystalline polymers tend to have greater elasticity, while amorphous polymers tend to be stronger. 
C) Both crystalline and amorphous polymers are strong but have little elasticity. 
D) Both crystalline and amorphous polymers have great elasticity but have little strength.

Question 2

When polyester is formed as a film as opposed to a fiber,it is used in

Accepted Answer

A) party balloons. 
B) floor tile. 
C) bulletproof vests. 
D) artificial limbs. 
A) party balloons. 
B) floor tile. 
C) bulletproof vests. 
D) artificial limbs.

Question 3

Vulcanization of rubber was discovered by

Accepted Answer

A) Charles Goodrich. 
B) Charles Goodyear. 
C) Charles Firestone. 
D) Charles Vulcan. 
A) Charles Goodrich. 
B) Charles Goodyear. 
C) Charles Firestone. 
D) Charles Vulcan.

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

Sulfur acts as a cross-linker when rubber is vulcanized.Explain why this cross-linking improves the performance of rubber.

Accepted Answer

Sulfur acts as a cross-linker during the

Question 6

Polystyrene is not used for

Accepted Answer

A) condiment bottles. 
B) disposable coffee cups. 
C) material for packing. 
D) home insulation. 
A) condiment bottles. 
B) disposable coffee cups. 
C) material for packing. 
D) home insulation.

Question 7

Which of the following natural polymers is a polyamide?

Accepted Answer

A) nylon 
B) plant fibers 
C) wool 
D) amylopectin 
A) nylon 
B) plant fibers 
C) wool 
D) amylopectin

Question 8

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 9

In the vulcanization of rubber,sulfur

Accepted Answer

A) is inserted into the carbon chain. 
B) breaks long carbon chains into smaller chains. 
C) forms links between polymer chains. 
D) links all chains into one long chain. 
A) is inserted into the carbon chain. 
B) breaks long carbon chains into smaller chains. 
C) forms links between polymer chains. 
D) links all chains into one long chain.

Question 10

The glass transition temperature,Tg,is the temperature above which the polymer becomes brittle.

Accepted Answer

A) True 
 B)False

Question 11

One of the first applications of polyethylene was

Accepted Answer

A) billiard balls. 
B) garbage bags. 
C) electrical insulation. 
D) parachutes. 
A) billiard balls. 
B) garbage bags. 
C) electrical insulation. 
D) parachutes.

Question 12

What is the connection between polyethylene and the "Battle of Britain" in the second World War?

Accepted Answer

PE as insu

Question 13

Distinguish between a polymer like polyethylene and a copolymer like styrene-butadiene rubber (SBR).

Accepted Answer

Polyethylene and styrene-butadiene rubbe

Question 14

What are composite materials? What are their advantages? Give two examples of products that use composite materials.

Accepted Answer

Composite materials, also known as compo

Question 15

Which of the following is NOT a naturally occurring polymer?

Accepted Answer

A) celluloid 
B) cellulose 
C) starch 
D) wool 
A) celluloid 
B) cellulose 
C) starch 
D) wool

Question 16

HDPE stands for

Accepted Answer

A) high-density polyethylene. 
B) hot-dipped polyethylene. 
C) high-dose polyethylene. 
D) highly-diffuse polyethylene. 
A) high-density polyethylene. 
B) hot-dipped polyethylene. 
C) high-dose polyethylene. 
D) highly-diffuse polyethylene.

Question 17

A polymer that conducts electricity is

Accepted Answer

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

Question 18

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 19

Which of the following will result from adding a plasticizer to a polymer?

Accepted Answer

A) They will have a higher glass transition temperature, Tg. 
B) They will be more rigid. 
C) They will be more transparent. 
D) They will be less brittle. 
A) They will have a higher glass transition temperature, Tg. 
B) They will be more rigid. 
C) They will be more transparent. 
D) They will be less brittle.

Question 20

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.

Exam 10: Polymers

Which of the following statements about crystalline and amorphous polymers is correct?

When polyester is formed as a film as opposed to a fiber,it is used in

Vulcanization of rubber was discovered by

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

Sulfur acts as a cross-linker when rubber is vulcanized.Explain why this cross-linking improves the performance of rubber.

Polystyrene is not used for

Which of the following natural polymers is a polyamide?

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

In the vulcanization of rubber,sulfur

The glass transition temperature,Tg,is the temperature above which the polymer becomes brittle.

One of the first applications of polyethylene was

What is the connection between polyethylene and the "Battle of Britain" in the second World War?

Distinguish between a polymer like polyethylene and a copolymer like styrene-butadiene rubber (SBR).

What are composite materials? What are their advantages? Give two examples of products that use composite materials.

Which of the following is NOT a naturally occurring polymer?

HDPE stands for

A polymer that conducts electricity is

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

Which of the following will result from adding a plasticizer to a polymer?

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

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