Chem 1002 Ch 10

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

53) The molecule most commonly split out between monomers to make a condensation polymer is A) H2O. B) NH3. C) HCl. D) H2S.

A) H2O.

63) The most commonly recycled plastics are A) HDPE and PET. B) PET and PS. C) HDPEand PS. D) PET and styrene-butadiene.

A) HDPE and PET.

29) The pendant group in polystyrene is a(n) A) benzene ring. B) chlorine atom. C) ethyl group. D) methyl group.

A) benzene ring.

7) The first "practical" application of celluloid was A) billiard balls. B) movie film. C) stiff collars. D) airplane wings.

A) billiard balls.

5) Which of the following is NOT a naturally occurring polymer? A) celluloid B) cellulose C) starch D) All of the above are naturally occurring polymers.

A) celluloid

6) Celluloid is a chemical modification of which natural product? A) cellulose B) cells C) ivory D) cellophane

A) cellulose

44) 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 A) greater than 40°C. B) less than 40°C but greater than 0°C. C) exactly 0°C. D) less than 0°C.

A) greater than 40°C.

13) Thermoplastic polymers may be A) heated and reformed. B) heated, but not reformed. C) decomposed by heating. D) changed in color by heating.

A) heated and reformed.

21) The monomer of PVC differs from the monomer of PE by A) one atom. B) two atoms. C) three atoms. D) four atoms.

A) one atom.

30) The monomer from which polyethylene is made has ________ attached to the C=C. A) only H atoms B) a Cl atom C) a benzene ring D) a methyl group

A) only H atoms

2) The word polymer means many A) parts. B) sides. C) rings. D) carbons.

A) parts.

39) When polyester is formed as a film as opposed to a fiber, it is used in A) party balloons. B) floor tile. C) bulletproof vests. D) artificial limbs.

A) party balloons.

24) A polymer that conducts electricity is A) polyacetylene. B) polyethylene. C) polyvinyl chloride. D) polystyrene.

A) polyacetylene.

57) Toxic hydrogen cyanide (HCN) is generated by burning A) polyacrylonitrile (acrylics). B) styrofoam. C) polyvinyl chloride (vinyl plastics). D) polyethylene.

A) polyacrylonitrile (acrylics).

25) This formula in which n can be a very large number represents which of the following polymers? H H | | -[-C - C-]-n | | H H A) polyethylene B) polyvinyl chloride C) polypropylene D) teflon

A) polyethylene

16) The polymer segment ~CH2CH2CH2CH2CH2CH2CH2~ represents A) polyethylene. B) polypropylene. C) polystyrene. D) polyvinyl chloride.

A) polyethylene.

36) One of the disadvantages of polybutadiene rubber for automobile tires is A) poor resistance to gasoline and oils. B) its color. C) density. D) expense.

A) poor resistance to gasoline and oils.

11) High-density polyethylene is composed of 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 high density plasticizers added to increase density.

A) primarily linear, unbranched chains of polyethylene in a close packing arrangement.

48) Amorphous polymers are composed of A) randomly organized polymer chains. B) highly organized polymer chains. C) a mixture of random and highly organized polymer chains. D) none of the above

A) randomly organized polymer chains.

1) Monomers are A) small building blocks of polymers. B) small polymers. C) ethylene. D) all of the above

A) small building blocks of polymers.

64) All of the following statements about biodegradable polymers are true EXCEPT A) some can biodegrade by composting. B) the most sustainable approach is to use renewable resources, especially non-food crops, as a monomer source. C) their glass transition temperatures are very high. D) many require microorganisms to degrade them.

A) some can biodegrade by composting.

54) One of the advantages of incinerating plastics is A) the high fuel value. B) no air pollution. C) all polymers burn efficiently. D) All of the above are advantages of incinerating plastics.

A) the high fuel value.

35) The main use of elastomers is making A) tires. B) synthetic body parts. C) plastic bottles. D) film.

A) tires.

15) A copolymer is composed of A) two or more different monomers. B) different polymers linked end to end. C) different polymers cross-linked. D) none of the above

A) two or more different monomers.

33) Elastomers are synthetic polymers that mimic the properties of A) vulcanized rubber. B) polyethylene. C) celluloid. D) PVC.

A) vulcanized rubber.

20) The monomer of polypropylene is A) CH2CH2. B) CH2CHCH3. C) CH3CH3. D) CH3CH2CH3.

B) CH2CHCH3.

59) Production of PCBs was discontinued in 1977, yet PCBs are still found in the environment. The reason for this is A) PCBs are formed naturally by plants and animals. B) PCBs are very stable molecules. C) PCBs are very reactive molecules. D) PCBs are imported from other countries where their production is not banned.

B) PCBs are very stable molecules.

3) Which statement relating monomers and polymers is correct? A) They have the same chemical and physical properties. B) They have different chemical and physical properties. C) The monomer is usually a solid, while the polymer is usually a liquid or gas. D) They have the same chemical formula.

B) They have different chemical and physical properties.

47) The temperature inside the mouth is about 37°C. Polyvinyl acetate, a polymer used in chewing gum, has a Tg A) above 37°C. B) below 37°C. C) exactly 37°C. D) above 100°C.

B) below 37°C.

37) The substance in paints that hardens to form a continuous surface coating is called a A) pigment. B) binder. C) solvent. D) thinner.

B) binder.

19) Which of the following types of carbon consists of one-atom-thick planar sheets of carbons? A) buckyballs B) graphene C) graphite D) nanotubes

B) graphene

51) Plexiglas is a polymethyl methacrylate polymer that is used as a glass substitute. The Tg of Plexiglas is A) low. B) high. C) moderate. D) not important.

B) high.

49) Crystalline polymers are composed of A) randomly organized polymer chains. B) highly organized polymer chains. C) a mixture of random and highly organized polymer chains. D) none of the above

B) highly organized polymer chains.

38) One example of a condensation polymer is A) polyethylene. B) nylon. C) Teflon. D) polystyrene.

B) nylon.

61) The source of starting materials for synthetic polymers is primarily A) plants. B) petroleum and natural gas. C) recycled plastics. D) animals.

B) petroleum and natural gas.

40) The segment of a polymer shown below represents a O O || || ~C-CH2CH2-C-OCH2CH2O~ A) polyamide. B) polyester. C) polyethylene. D) polystyrene.

B) polyester.

8) Which of the following is the simplest synthetic polymer? A) polymethane B) polyethylene C) polyvinyl chloride D) polystyrene

B) polyethylene

18) Carbon can exist in several forms. Which of the following is NOT a form of carbon and contains other atoms besides carbon? A) graphite B) polystyrene C) graphene D) diamond

B) polystyrene

27) This formula in which n can be a very large number represents which of the following polymers? H H | | -[-C - C-]-n | | H Cl A) polyethylene B) polyvinyl chloride C) polypropylene D) teflon

B) polyvinyl chloride

12) HDPE finds applications in A) food wrap. B) rigid containers. C) squeeze bottles. D) garbage bags.

B) rigid containers.

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

C) HDPE is more flexible than LDPE is.

56) Which of the following is currently the most desirable method to minimize the problem of disposal of plastics? A) Deposit them in a landfill. B) Incinerate them. C) Recycle them. D) Use biodegradable plastics.

C) Recycle them.

62) Which of the following is a problem with the use of plastics? A) They have a low density. B) They can conduct electricity. C) They are made from petroleum and natural gas. D) They can be made from renewable plant resource.

C) They are made from petroleum and natural gas.

55) Which of the following characteristics of synthetic polymers is NOT a problem? A) They frequently are neither biodegradable nor photodegradable. B) They frequently give off poisonous gases when they are burned. C) They generally have a high energy content and can be burned. D) They make up a large volume of the waste which goes into landfills.

C) They generally have a high energy content and can be burned.

65) Which of the following statements about biodegradable polymers is true? A) They will degrade quickly in a landfill. B) Thermosetting polymers are biodegradable, but thermoplastics are not. C) They often require specific temperatures or the presence of microorganisms in order to undergo degredation. D) Polyvinyl chloride is a biodegradable polymer.

C) They often require specific temperatures or the presence of microorganisms in order to undergo degredation.

34) Styrene-butadiene rubber (SBR) is a A) condensation polymer. B) vulcanized rubber. C) copolymer. D) all of the above

C) copolymer.

10) One of the first applications of polyethylene was A) billiard balls. B) garbage bags. C) electrical insulation. D) parachutes.

C) electrical insulation.

32) In the vulcanization of rubber, sulfur 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.

C) forms links between polymer chains.

26) This formula in which n can be a very large number represents which of the following polymers? H H | | -[-C - C-]-n | | H CH3 A) polyethylene B) polyvinyl chloride C) polypropylene D) Teflon

C) polypropylene

42) Which of the following natural polymers is a polyamide? A) cotton fibers B) wood fibers C) silk D) starch

C) silk

41) Which of the following is/are condensation polymers? A) polyamide B) polyurethane C) polyester D) All are condensation polymers.

D) All are condensation polymers.

22) Polyvinyl chloride is used for drain pipes in plumbing applications. It has replaced traditional cast iron pipe for this purpose. The major advantage of PVC in replacing cast iron for this application (particularly if you are a plumber or homeowner) is that PVC A) is of lighter weight. B) is easier to handle and cut. C) is more resistant to corrosion. D) All of the above are advantages of PVC.

D) All of the above are advantages of PVC.

43) Which of the following is NOT true of composite materials? A) They contain high-strength fibers, often made from glass, graphite or ceramics. B) The fibers provide support to the composite material. C) The fibers are usually held together by a thermosetting condensation polymer. D) All of the above are true.

D) All of the above are true.

23) The monomer used to make Teflon is A) H2CCH2. B) Cl2CCH2. C) H2CCHCl. D) F2CCF2.

D) F2CCF2.

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

D) They will be less brittle.

50) 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 A) natural rubber. B) amorphous polymers. C) crystalline polymers. D) a creative combination of amorphous and crystalline polymers.

D) a creative combination of amorphous and crystalline polymers.

9) Polyethylene is A) tough. B) flexible. C) thermoplastic. D) all of these

D) all of these

58) The greatest hazard in using plastics in home building materials and furnishings is that some A) poison children who eat them. B) cause cancer. C) are slippery. D) form poisonous gases when burned.

D) form poisonous gases when burned.

31) Natural rubber can be made from the monomer A) ethylene. B) propylene. C) butadiene. D) isoprene.

D) isoprene.

45) An object will be used in an environment that has a temperature range of -20°C to 10°C. The object must remain flexible and rubbery. It should have a Tg that is A) greater than 10°C. B) less than 10°C but greater than -20°C. C) exactly -20°C. D) less than -20°C.

D) less than -20°C.

46) The temperature in many parts of the world can range between 0°C and 40°C, therefore we want the Tg of PVC used as seat covers in cars to be A) greater than 40°C. B) less than 40°C but greater than 0°C. C) exactly 0°C. D) less than 0°C.

D) less than 0°C.

4) Natural polymers which carry the coded genetic information that makes each individual unique are A) proteins. B) carboxylic acids. C) esters. D) nucleic acids.

D) nucleic acids.

14) The development of which polymer enabled the British to have effective radar equipment and thus contributed to the British success in the Battle of Britain in World War II? A) polystyrene B) polyvinyl chloride C) Teflon D) polyethylene

D) polyethylene

28) This formula in which n can be a very large number represents which of the following polymers? H H | | -[-C - C-]-n | | H C6H5 A) polyethylene B) polyvinyl chloride C) polypropylene D) polystyrene

D) polystyrene