Chemistry (Chang), 10th Edition

Chapter 25: Synthetic and Natural Organic Polymer

Self Assessment B

1
Addition homopolymers, when composed of asymmetric monomers, have the greatest crystallinity and superior mechanical properties if they are
A)isotactic.
B)atactic.
C)syndiotactic.
D)vulcanized.
E)B and C.
2
Natural rubber is
A)formed by the addition reaction of styrene.
B)formed by the addition reaction of isoprene.
C)vulcanized by the addition of phosphorus.
D)another name for poly-trans-isoprene.
3
Vulcanization
A)leads to cross-linking of poly-cis-isoprene chains in rubber with sulfur.
B)provides considerable elasticity in rubber.
C)severs the carbon-carbon chain in rubber.
D)provides a smooth surface to rubber.
E)A and B.
F)B and C.
4
Which of the following is the basic structure of an amino acid?
A)H2NCOOH
B)RCH2CONH2
C)H2NCH2CHRCOOH
D)H2NCHRCOOH
5
The molecule formed from the condensation of two amino acids is called
A)a protein.
B)a dipeptide.
C)a polypeptide.
D)DNA.
E)RNA.
6
The tertiary structure of a protein is established by
A)hydrogen bonding.
B)dispersion forces.
C)ionic interactions.
D)All of the above.
7
Denaturation of proteins
A)occurs when they are heated or treated with acids or bases.
B)results in loss of secondary and tertiary structure.
C)results in loss of primary structure.
D)A and B.
E)All of the above.
8
Which of the following is a synthetic polymer?
A)cellulose
B)polyisoprene
C)DNA
D)poly(hexamethyleneadipamide)
E)enzymes
9
The sugar components of DNA and RNA are, respectively,
A)deoxyribose and ribose.
B)ribose and deoxyribose.
C)deoxyribose and guanine.
D)deoxyribose and cytosine.
E)cytosine and guanine.
10
The molar mass of DNA is on the order of
A)2.5 x 102 g/mol.
B)2.5 x 103 g/mol.
C)2.5 x 104 g/mol.
D)2.5 x 106 g/mol.
E)2.5 x 1010 g/mol.
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