Question 1

In a recycling symbol, the ________ the number in the middle of the symbol, the more easily the compound can be recycled.

Accepted Answer

lower

Question 2

The choice of mechanism in chain-growth polymerization depends on which of the following?

Accepted Answer

A) structure of the monomer and initiator used 
B) structure of the polymer and initiator used 
C) temperature and pressure of the reaction 
D) A and B 
E) A, B, and C 
A) structure of the monomer and initiator used 
B) structure of the polymer and initiator used 
C) temperature and pressure of the reaction 
D) A and B 
E) A, B, and C A

Question 3

List the two major classes of synthetic polymers and give one example of each.

Accepted Answer

a) Addition polymers, also known as chain-growth polymers; polystyrene for example.
b) Condensation polymers, also known as step-growth polymers; nylon for example.

Question 4

Which of the following are characteristics of thermosetting polymers?

Accepted Answer

A) strong and rigid 
B) high degree of cross-linking 
C) can be remelted by heating 
D) A and B 
E) A, B, and C 
A) strong and rigid 
B) high degree of cross-linking 
C) can be remelted by heating 
D) A and B 
E) A, B, and C

Question 5

Provide the structure of poly(acrylonitrile).

Accepted Answer

The answer of Provide the structure of poly(acrylonitrile)....

Question 6

List the three phases in the mechanism of chain-growth polymerization.

Accepted Answer

1. Initiat

Question 7

Identify the initiator in a radical polymerization.

Accepted Answer

A) KOH 
B) BuLi 
C) CH3OOCH3 
D) BF3, H2O 
E) HCl 
A) KOH 
B) BuLi 
C) CH3OOCH3 
D) BF3, H2O 
E) HCl

Question 8

Chain-growth polymerization proceeds by which of the following mechanisms?

Accepted Answer

A) radical polymerization 
B) cationic polymerization 
C) anionic polymerization 
D) A and B 
E) A, B, and C 
A) radical polymerization 
B) cationic polymerization 
C) anionic polymerization 
D) A and B 
E) A, B, and C

Question 9

Which of the following statements concerning the stereochemistry of polymerization is (are)correct?

Accepted Answer

A) Polymers in the atactic configuration are more likely to be crystalline solids because regular packing of the polymer chains is easier. 
B) Polymers in the isotactic configuration tend to be softer and more flexible than atactic polymers. 
C) In general, radical polymerization leads primarily to branched polymers in the syndiotactic configuration. 
D) The percentage of chains in the isotactic or syndiotactic configuration decreases as the polymerization temperature decreases. 
E) none of the above 
A) Polymers in the atactic configuration are more likely to be crystalline solids because regular packing of the polymer chains is easier. 
B) Polymers in the isotactic configuration tend to be softer and more flexible than atactic polymers. 
C) In general, radical polymerization leads primarily to branched polymers in the syndiotactic configuration. 
D) The percentage of chains in the isotactic or syndiotactic configuration decreases as the polymerization temperature decreases. 
E) none of the above

Question 10

Provide the structure of poly(propylene).

Accepted Answer

The answer of Provide the structure of poly(propylene)....

Question 11

Which of the following is more likely to undergo both radical and cationic polymerization?

Accepted Answer

A) I 
B) II 
C) III 
D) IV 
E) V 
A) I 
B) II 
C) III 
D) IV 
E) V

Question 12

Draw the structure of the polymer and by-product that result when the two monomers below are heated together.

Accepted Answer

The answer of Draw the structure of the polymer and...

Question 13

Identify the monomers that undergo anionic polymerization.

Accepted Answer

A) styrene 
B) methyl methacrylate 
C) vinyl chloride 
D) methyl vinyl ether 
E) acrylamide 
A) styrene 
B) methyl methacrylate 
C) vinyl chloride 
D) methyl vinyl ether 
E) acrylamide

Question 14

Provide a mechanism to show how H2C   C(CH3)2 is polymerized using BF3 as the initiator.

Accepted Answer

Question 15

Identify the type of polymer for poly(vinyl chloride).

Accepted Answer

A) homopolymer 
B) graft copolymer 
C) random copolymer 
D) block copolymer 
E) alternating copolymer 
A) homopolymer 
B) graft copolymer 
C) random copolymer 
D) block copolymer 
E) alternating copolymer

Question 16

Which of the following is the first chain propagating step in the radical polymerization of ethylene?

Accepted Answer

A) ROOR + CH2     CH2 → ROCH2CH2OR 
B)  ∙ RO∙ + CH2
    CH2 → ROCH2CH2 
C) RO∙ + CH2     CH2 → ROCH   CH2 + H∙ 
D)  ∙ ∙ ROOR + CH2
    CH2 → 2 ROH + CH   CH 
E)  ∙ ∙ 2RO∙ + CH2
    CH2 → 2 ROH + CH   CH 
A) ROOR + CH2     CH2 → ROCH2CH2OR 
B)  ∙ RO∙ + CH2
    CH2 → ROCH2CH2 
C) RO∙ + CH2     CH2 → ROCH   CH2 + H∙ 
D)  ∙ ∙ ROOR + CH2
    CH2 → 2 ROH + CH   CH 
E)  ∙ ∙ 2RO∙ + CH2
    CH2 → 2 ROH + CH   CH

Question 17

Identify the product of the following reaction.

Accepted Answer

A) nylon 44 
B) nylon 6 
C) nylon 4 
D) nylon 66 
E) nylon 55 
A) nylon 44 
B) nylon 6 
C) nylon 4 
D) nylon 66 
E) nylon 55

Question 18

Give the purpose of the amine in the formation of the epoxy resin.

Accepted Answer

A) a softener 
B) hardener 
C) a monomer in te reaction 
D) to dehydrate the monomer 
E) to chill the polymer 
A) a softener 
B) hardener 
C) a monomer in te reaction 
D) to dehydrate the monomer 
E) to chill the polymer

Question 19

Which of the following initiators are known as Ziegler-Natta catalysts, which were discovered in 1953 in order to control the stereochemistry of polymers?

Accepted Answer

A) Al/Ti initiators 
B) Ni/Cd initiators 
C) Zn/Hg initiators 
D) Pb/C initiators 
E) Pb/PbO2 initiators 
A) Al/Ti initiators 
B) Ni/Cd initiators 
C) Zn/Hg initiators 
D) Pb/C initiators 
E) Pb/PbO2 initiators

Question 20

Which of the following monomers has the greatest ability to undergo cationic polymerization?

Accepted Answer

A) I 
B) II 
C) III 
D) IV 
E) V 
A) I 
B) II 
C) III 
D) IV 
E) V

Exam 27: Synthetic Polymers

In a recycling symbol, the ________ the number in the middle of the symbol, the more easily the compound can be recycled.

The choice of mechanism in chain-growth polymerization depends on which of the following?

List the two major classes of synthetic polymers and give one example of each.

Which of the following are characteristics of thermosetting polymers?

Provide the structure of poly(acrylonitrile).

List the three phases in the mechanism of chain-growth polymerization.

Identify the initiator in a radical polymerization.

Chain-growth polymerization proceeds by which of the following mechanisms?

Which of the following statements concerning the stereochemistry of polymerization is (are)correct?

Provide the structure of poly(propylene).

Which of the following is more likely to undergo both radical and cationic polymerization?

Draw the structure of the polymer and by-product that result when the two monomers below are heated together.

Identify the monomers that undergo anionic polymerization.

Provide a mechanism to show how H2C C(CH3)2 is polymerized using BF3 as the initiator.

Identify the type of polymer for poly(vinyl chloride).

Which of the following is the first chain propagating step in the radical polymerization of ethylene?

Identify the product of the following reaction.

Give the purpose of the amine in the formation of the epoxy resin.

Which of the following initiators are known as Ziegler-Natta catalysts, which were discovered in 1953 in order to control the stereochemistry of polymers?

Which of the following monomers has the greatest ability to undergo cationic polymerization?

Remembering General Chemistry: Electronic Structure and Bonding

Acids and Bases: Central to Understanding Organic Chemistry

An Introduction to Organic Compounds

Isomers: the Arrangement of Atoms in Space

Alkenes Thermodynamics and Kinetics

Reactions of Alkenes

Reactions of Alkynes Introduction to Multistep Synthesis

Electron Delocalization, Resonance, and Aromaticity More About Molecular Orbital Theory

Substitution Reactions of Alkyl Halides

Elimination Reactions of Alkyl Halides Competition Between Substitution and Elimination

Reactions of Alcohols, Ethers, Epoxides, and Sulfur-Containing Compounds

Organometallic Compounds

Reactions of Alkanes, Radicals

Mass Spectrometry, Infrared Spectroscopy, and Uvvis Spectroscopy

Nmr Spectroscopy

Reactions of Carboxylic Acids and Carboxylic Acid Derivatives

Reactions of Aldehydes and Ketones

Reactions at the Alpha Carbon of Carbonyl Compounds

Reactions of Benzene and Substituted Benzenes

More About Amines Heterocylic Compounds

Carbohydrates

Amino Acids, Peptides, and Proteins

Catalysis

The Organic Mechanisms of the Coenzymes

The Chemistry of Metabolism

Nucleosides, Nucleotides, and Nucleic Acids

Pericyclic Reactions

Filters

Provide a mechanism to show how H₂C C(CH₃)₂ is polymerized using BF₃ as the initiator.