Question 1

What modification occurs when a small amount of p-divinylbenzene is added to the polymerization reaction of styrene to form polystyrene? (Recall that the vinyl group is -CH=CH2.)

Accepted Answer

A)   Cross-linking of the polystyrene
B)   Isotactic stereochemistry of the polystyrene
C)   Syndiotactic stereochemistry of the polystyrene
D)   "Softening" of the polystyrene by a plasticizerE) All of the above
F) B) and C)

Question 2

Which of the following sets of products results if nylon 66 is treated with sulfuric acid?

Accepted Answer

A)   A
B)   B
C)   C
D)   DE) A) and B)
F) A) and C)

Question 3

Rank the following monomers (X, Y and Z)  in order of increasing ability to undergo anionic polymerization, starting with the least reactive monomer.

Accepted Answer

A)   Y 
B)   Z 
C)   X 
D)   Y < Z < XE) B) and C)
F) A) and C)

Question 4

What is the name given to polymers with single monomers?

Accepted Answer

A)   homopolymers
B)   copolymers
C)   block polymers
D)   random polymersE) A) and B)
F) A) and C)

Question 5

What is the structure of the polymer which results when styrene is reacted with BF3 and H2O? 3 and H2O?   A)  A B)  B C)  C D)  D" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   A
B)   B
C)   C
D)   DE) A) and B)
F) A) and D)

Question 6

What is the classification of the following polymer in which X and Y represent repeating units?

Accepted Answer

A)   block copolymer
B)   homopolymer
C)   alternating copolymer
D)   random copolymerE) A) and B)
F) A) and C)

Question 7

Which one of the following monomers undergoes anionic polymerization most readily?

Accepted Answer

A)   H2C=CH2
B)   H2C=CHCH3
C)   H2C=C(CH3) 2
D)   H2C=CHCNE) A) and C)
F) A) and B)

Question 8

Which of the following is the monomer that gives the polymer shown below?

Accepted Answer

A)   A
B)   B
C)   C
D)   DE) B) and D)
F) All of the above

Question 9

Which monomer and which type of initiator would you use to synthesize the following polymer?

Accepted Answer

A)   A
B)   B
C)   C
D)   D
E)   EF) C) and E)
G) A) and D)

Question 10

Vulcanization is the process of cross-linking polymer chains in rubber using what chemical?

Accepted Answer

A)   sulfur
B)   formaldehyde
C)   benzoyl peroxide
D)   ethylene glycolE) B) and D)
F) B) and C)

Question 11

The monomer used to make superglue is shown below. Which of the following methods of polymerization is most suitable for this type of monomer?

Accepted Answer

A)   free-radical chain-growth
B)   cationic chain-growth
C)   anionic chain-growth
D)   acid-catalyzed step-growthE) A) and C)
F) A) and B)

Question 12

What is the purpose of plasticizers?

Accepted Answer

A)   to harden plastics
B)   to soften plastics
C)   to initiate polymerizations
D)   to cross-link polymer chainsE) C) and D)
F) A) and B)

Question 13

In which type of polymer are the chains packed less tightly together, resulting in lower melting points and a softer texture?

Accepted Answer

A)   isotactic polymers
B)   syndiotactic polymers
C)   atactic polymers
D)   cross-linked polymersE) A) and B)
F) A) and C) C

Question 14

The repeating unit of a polymer is shown below. This polymer is formed by

Accepted Answer

A)   addition of ethylene.
B)   addition of trans-2-butene.
C)   1,2 addition of butadiene.
D)   1,4 addition of butadiene.E) C) and D)
F) A) and B) D

Question 15

Which of the following initiators can be used for free radical chain-growth polymerization?

Accepted Answer

A)   benzoyl peroxide
B)   CH3CH2CH2CH2Li
C)   BF3
D)   Al(CH2CH3) 3, TiCl4E) A) and B)
F) None of the above

Question 16

Identify the monomer(s)  needed to make the following polyester.

Accepted Answer

A)   3-hydroxybutanoic acid
B)   butanedioic acid
C)   butanedioic acid and ethylene glycol
D)   butanedioic acid and ethanolE) B) and C)
F) All of the above

Question 17

Identify the repeating unit in the polymer formed from the following reaction sequence.

Accepted Answer

A)   A
B)   B
C)   C
D)   DE) A) and B)
F) A) and C)

Question 18

Which of the following is (are)  condensation polymer(s) ? I. polypropylene
II)  Teflon
III)  nylon

Accepted Answer

A)   Only I
B)   Only II
C)   Only III
D)   Both II and IIIE) A) and D)
F) A) and C)

Question 19

The repeating unit of poly(methyl methacrylate)  is shown below. Which one of the following is the monomer used to make poly(methyl methacrylate) ?

Accepted Answer

A)   A
B)   B
C)   C
D)   DE) C) and D)
F) A) and D) B

Question 20

The acid-catalyzed dimerization of isobutylene gives a mixture of two isomeric alkenes, A and B. Hydrogenation of this mixture gives a single C8H18 hydrocarbon. What is the structure of this hydrocarbon? 8H18 hydrocarbon. What is the structure of this hydrocarbon?   A)  2,2,4-trimethylpentane B)  2,3,4-trimethylpentane C)  2,4-dimethylhexane D)  2,5-dimethyhexane" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   2,2,4-trimethylpentane
B)   2,3,4-trimethylpentane
C)   2,4-dimethylhexane
D)   2,5-dimethyhexaneE) A) and C)
F) A) and D)

Exam 31: Synthetic Polymers

What modification occurs when a small amount of p-divinylbenzene is added to the polymerization reaction of styrene to form polystyrene? (Recall that the vinyl group is -CH=CH2.)

Correct AnswerverifiedShow Answer

Which of the following sets of products results if nylon 66 is treated with sulfuric acid?

Correct AnswerverifiedShow Answer

Rank the following monomers (X, Y and Z) in order of increasing ability to undergo anionic polymerization, starting with the least reactive monomer.

Correct AnswerverifiedShow Answer

What is the name given to polymers with single monomers?

Correct AnswerverifiedShow Answer

What is the structure of the polymer which results when styrene is reacted with BF3 and H2O?

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What is the classification of the following polymer in which X and Y represent repeating units?

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Which one of the following monomers undergoes anionic polymerization most readily?

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Which of the following is the monomer that gives the polymer shown below?

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Which monomer and which type of initiator would you use to synthesize the following polymer?

Correct AnswerverifiedShow Answer

Vulcanization is the process of cross-linking polymer chains in rubber using what chemical?

Correct AnswerverifiedShow Answer

The monomer used to make superglue is shown below. Which of the following methods of polymerization is most suitable for this type of monomer?

Correct AnswerverifiedShow Answer

What is the purpose of plasticizers?

Correct AnswerverifiedShow Answer

In which type of polymer are the chains packed less tightly together, resulting in lower melting points and a softer texture?

Correct AnswerverifiedC

The repeating unit of a polymer is shown below. This polymer is formed by

Correct AnswerverifiedD

Which of the following initiators can be used for free radical chain-growth polymerization?

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Identify the monomer(s) needed to make the following polyester.

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Identify the repeating unit in the polymer formed from the following reaction sequence.

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Which of the following is (are) condensation polymer(s) ? I. polypropylene II) Teflon III) nylon

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The repeating unit of poly(methyl methacrylate) is shown below. Which one of the following is the monomer used to make poly(methyl methacrylate) ?

Correct AnswerverifiedB

The acid-catalyzed dimerization of isobutylene gives a mixture of two isomeric alkenes, A and B. Hydrogenation of this mixture gives a single C8H18 hydrocarbon. What is the structure of this hydrocarbon?

Correct AnswerverifiedShow Answer

What modification occurs when a small amount of p-divinylbenzene is added to the polymerization reaction of styrene to form polystyrene? (Recall that the vinyl group is -CH=CH₂.)

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What is the structure of the polymer which results when styrene is reacted with BF₃ and H₂O?

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C

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D

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B

The acid-catalyzed dimerization of isobutylene gives a mixture of two isomeric alkenes, A and B. Hydrogenation of this mixture gives a single C₈H₁₈ hydrocarbon. What is the structure of this hydrocarbon?

Correct Answer
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