Deck 23: Polymeric Materials and Soft Condensed Matter

Question 1

Which of the following are steps in radical-induced addition polymerization?

A) initiation
B) propagation
C) termination
D) all of the above
E) None of the above

Answer 1

D

Question 2

_______ are combined to make ______.

A) Polymers, monomers
B) Micelles, polymers
C) Polymers, carbohydrates
D) Enzymes, proteins
E) none of the above

Answer 2

E

Question 3

Which form of HDPE has the methyl groups arranged in a regular alternating conformation about the carbon backbone?

A) atactic
B) isotactic
C) syndiotactic
D) zeolitic
E) none of the above

Answer 3

C

Question 4

The process of vulcanization combines natural rubber with

A) sulfur
B) metals such as iron and manganese
C) zeolites
D) clays
E) none of the above

Question 5

In order to conduct electricity, conducting polymers must have

A) Dopants located interstitially between polymeric chains
B) only single, s-type bonding
C) occasional triple bonds to allow for quick electron movement between adjacent species
D) alternating single and double bonds with conjugated p-type bonding
E) a and c
F) a and d
G) none of the above

Question 6

In which type of polymerization do monomers combine to form a polymer chain without a net loss of atoms?

A) Condensation polymerization
B) Addition polymerization
C) Alpha helix extension
D) Graft polymerization
E) none of the above

Question 7

PVC for plumbing pipes can be made through the process of

A) Addition polymerization
B) Peptide linkage
C) Alpha helix extension
D) Transfer polymerization
E) None of the above

Question 8

Free radical polymerization can be terminated when two polymer chains collide.

Question 9

Ionic polymers are sometimes called living polymers because

A) they are frequently found in living tissue
B) their formation resembles the same manner in which plant grow
C) their polymerization can be resumed at a later date by the addition of monomer
D) all of the above

Question 10

What is the minimum number of active monomer sites required for cross linking?

A) 1
B) 2
C) 3
D) 4
E) >4

Question 11

What is the minimum number of active monomer sites required for cross linking into sheets?

A) 1
B) 2
C) 3
D) 4
E) >4

Question 12

What was the first synthetic fiber

A) acrylic
B) nylon
C) rayon
D) dacron

Question 13

What was the simplest monomer that will polymerize?

A) glycine
B) propene
C) ethylene
D) paraphenylene

Question 14

Natural rubber consists of

A) all-cis polyisoprene
B) all-trans polyisoprene
C) syndiotactic polyisoprene
D) isotactic polyisoprene
E) atactic polyisoprene

Question 15

Which of the following will affect the pitch of a liquid crystal?

A) distance between planes with the same orientation
B) chain length
C) temperature
D) a and b
E) a and c

Question 16

If amphiphiles are dissolved in water

A) They will form sheets of molecules
B) They will form spherical clusters with polar ends facing out
C) They will form spherical clusters with polar ends facing the center
D) Micelles will form
E) a and d
F) b and c

Question 17

Reverse micelles

A) Are formed in non-polar solvents
B) Can be formed in water
C) Will not form spherical clusters
D) Can be used to trap hydrocarbons

Question 18

Nucleotide monomers that make up DNA have exactly ______ parts.

A) 2
B) 3
C) 4
D) 6

Question 19

Which of the following purine bases can be found in a DNA nucleotide monomer?

A) thymine
B) cytosine
C) adenine
D) guanine
E) a and c
F) b and d
G) all of the above

Question 20

Which of the following bases are found in approximately equal amounts in DNA?

A) cytosine and adenine
B) cytosine and thymine
C) cytosine and guanine
D) adenine and guanine

Question 21

In DNA, genetic information is encoded by

A) hydrogen bonding
B) the order of the amino acids
C) transfer polymerization
D) the order of the base pairs
E) none of the above

Question 22

How many base pair triplets are available to encode genetic information?

A) 4
B) 8
C) 16
D) 32
E) 64

Question 23

The alpha helix

A) contains all information needed for the replication of an organism
B) is one of several structures adopted by polysaccharides
C) is the right-handed coil structure adopted by some proteins
D) is used to strengthen synthetic fibers.
E) None of the above

Question 24

Straight chain hexose sugars contain four chiral carbon atoms. How many different molecular configurations are there for a given straight chain hexose sugar structure.

A) 2
B) 4
C) 16
D) 256

Question 25

A copolymer

A) is a polymer formed from two or more different monomer units.
B) is a polymer consisting of two or more different monomer units arranged in nonrandom order.
C) requires free-radical initiation.
D) b and c
E) none of the above

Question 26

Fibrous proteins

A) contain all information needed for the replication of an organism
B) are structural materials in nature
C) include most enzymes
D) b and c
E) none of the above

Question 27

Either addition or condensation polymerization can be carried out with mixtures of two or more types of monomers present in the reactive mixture.

Question 28

When butadiene (H₂C=CH-C=CH₂) polymerizes to polybutadiene, the molecules of polymer have an average of how many double bonds per monomer unit?

A) 0
B) 1/2
C) 1
D) 3/2
E) 2

Question 29

Vinyl chloride (C₂H₃Cl) undergoes addition polymerization to give a high molecular mass polymer. The best empirical formula for this product is.

A) CH₃Cl
B) C₂H₂
C) C₂H₃
D) C₂H₃Cl
E) C₂HCl

Question 30

The formula of 6-aminohexanoic acid is C₆H₁₃NO₂. The compound undergoes condensation polymerization to give a straight-chained polyamide call nylon-6. The best empirical formula for nylon-6 is

A) C₆H₁₃NO₂
B) C₆H₁₂NO
C) C₆H₁₁N
D) C₆H₁₂NO₂
E) C₆H₁₁NO

Question 31

The isotactic, syndiotactic, and atactic forms of polypropylene differ in

A) the functional groups they contain around the carbon backbone
B) the terminating functional groups they contain
C) the positions of the methyl groups around the carbon backbone
D) the number of methyl groups around the carbon backbone
E) both C and D

Question 32

Starch is best described as a

A) lipid
B) simple sugar
C) amino acid
D) polysaccharide
E) peptide

Question 33

In the DNA molecule, thymine is always bonded to

A) adenine
B) cytosine
C) guanine
D) A or B
E) B or C