Question 1

Which of the following is (are) repeating unit(s) of step-growth polymers?

Accepted Answer

A)  Only I
B)  Only II
C)  Only III
D)  I and IIE) C) and D)
F) B) and C)

Question 2

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) C) and D)
F) All of the above

Question 3

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 C)
F) A) and D)

Question 4

What type of polymer is Lexan?

Accepted Answer

A)  Epoxy
B)  Polyurethane
C)  Polycarbonate
D)  PolyamideE) All of the above
F) A) and D)

Question 5

Melamine and formaldehyde combine to form the polymer,Melmac®.How is Melmac® classified,and what physical characteristics are consistent with its structure? ®.How is Melmac® classified,and what physical characteristics are consistent with its structure?   A) Polycarbonate,transparent B) Polyurethane,elastic C) Thermosetting,rigid D) Thermoplastic,can be melted and molded into new shapes" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  Polycarbonate,transparent
B)  Polyurethane,elastic
C)  Thermosetting,rigid
D)  Thermoplastic,can be melted and molded into new shapesE) B) and C)
F) A) and D)

Question 6

Which of the following monomers yields the polymer shown below?

Accepted Answer

A)  A
B)  B
C)  C
D)  DE) All of the above
F) None of the above

Question 7

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) C) and D)
F) A) and C) C

Question 8

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 D)
F) A) and B)

Question 9

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) B) and D)
F) B) and C)

Question 10

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

Question 11

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) All of the above
F) None of the above

Question 12

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 C)
F) B) and D)

Question 13

Which of the following best describes the polymer chain shown below?

Accepted Answer

A)  Atactic polypropylene
B)  Isotactic polypropylene
C)  Syndiotactic polypropylene
D)  Cross-linked polypropyleneE) None of the above
F) A) and B)

Question 14

What type of polymer is Spandex?

Accepted Answer

A)  HDPE
B)  Polyurethane
C)  Polycarbonate
D)  PolyamideE) B) and C)
F) A) and D) B

Question 15

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) B) and C)
F) A) and B)

Question 16

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) C) and D)
F) B) and C)

Question 17

Which of the following is used to make Teflon?

Accepted Answer

A)  Fluoroethene
B)  1,1,4,4-Tetrafluorobutadiene
C)  1,2-Difluoroethene
D)  TetrafluoroethyleneE) A) and D)
F) B) and C)

Question 18

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) C) and D)
F) A) and D)

Question 19

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

Accepted Answer

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

Question 20

Which type of polymerization process uses benzoyl peroxide (or other peroxides) as an initiator?

Accepted Answer

A)  Free-radical chain-growth
B)  Cationic chain-growth
C)  Anionic chain-growth
D)  Acid-catalyzed step-growthE) B) and D)
F) A) and D) A

Exam 28: Synthetic Polymers

Which of the following is (are) repeating unit(s) of step-growth polymers?

Correct AnswerverifiedShow Answer

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

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

Correct AnswerverifiedShow Answer

What type of polymer is Lexan?

Correct AnswerverifiedShow Answer

Melamine and formaldehyde combine to form the polymer,Melmac®.How is Melmac® classified,and what physical characteristics are consistent with its structure?

Correct AnswerverifiedShow Answer

Which of the following monomers yields the polymer shown below?

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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 AnswerverifiedC

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 is the purpose of plasticizers?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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Which of the following best describes the polymer chain shown below?

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What type of polymer is Spandex?

Correct AnswerverifiedB

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

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

Correct AnswerverifiedShow Answer

Which of the following is used to make Teflon?

Correct AnswerverifiedShow Answer

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

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

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Which type of polymerization process uses benzoyl peroxide (or other peroxides) as an initiator?

Correct AnswerverifiedA

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Melamine and formaldehyde combine to form the polymer,Melmac^®.How is Melmac^® classified,and what physical characteristics are consistent with its structure?

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C

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?

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B

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A