Question 1

are materials characterized by an energy gap between a filled valence band and an empty conduction band.

Accepted Answer

The answer of are materials characterized by an energy gap...

Question 2

Which of the following is not a natural polymer? silk
Starch protein cellulose nylon

Accepted Answer

A)  cellulose 
B)  protein 
C)  starch 
D)  silk 
E)  nylon 
A)  cellulose 
B)  protein 
C)  starch 
D)  silk 
E)  nylon

Question 3

Of the following, only is not a polymer. cellulose
Nylon starch protein
Stainless steel

Accepted Answer

A)  cellulose 
B)  nylon 
C)  starch 
D)  protein 
E)  stainless steel 
A)  cellulose 
B)  nylon 
C)  starch 
D)  protein 
E)  stainless steel

Question 4

A biomaterial intended for use as a long- term replacement of a blood vessel _ .

Accepted Answer

A)  must be rigid and chemically inert 
B)  must be flexible and have an open porous structure 
C)  should be designed such that it encourages coagulation of blood 
D)  must be rigid and must not degrade over time 
E)  must be rigid and have rough surfaces 
A)  must be rigid and chemically inert 
B)  must be flexible and have an open porous structure 
C)  should be designed such that it encourages coagulation of blood 
D)  must be rigid and must not degrade over time 
E)  must be rigid and have rough surfaces

Question 5

Of the following chemical forms, are not commonly found in ceramics.

Accepted Answer

A)  silicates 
B)  carbides 
C)  nitrates 
D)  oxides 
E)  aluminates 
A)  silicates 
B)  carbides 
C)  nitrates 
D)  oxides 
E)  aluminates

Question 6

Molecules containing only single bonds do not exhibit liquid- crystal behavior because free rotation can occur around single bonds making these molecules flexible.

Accepted Answer

A) True 
 B)False

Question 7

Write the chemical formulas for both polyethylene and the monomer from which it is formed.

Accepted Answer

Polyethyle

Question 8

Which of the following is not a biopolymer? protein
Polysaccharide polyurethane RNA
DNA

Accepted Answer

A)  RNA 
B)  DNA 
C)  protein 
D)  polyurethane 
E)  polysaccharide 
A)  RNA 
B)  DNA 
C)  protein 
D)  polyurethane 
E)  polysaccharide

Question 9

An elastomer will fail to regain its original dimensions following a distortion beyond its

Accepted Answer

A)  phase boundary 
B)  glass transition 
C)  London force 
D)  crystallinity 
E)  elastic limit 
A)  phase boundary 
B)  glass transition 
C)  London force 
D)  crystallinity 
E)  elastic limit

Question 10

In what year was the first systematic work involving liquid crystals reported?

Accepted Answer

A)  1776 
B)  1954 
C)  1943 
D)  1978 
E)  1888 
A)  1776 
B)  1954 
C)  1943 
D)  1978 
E)  1888

Question 11

Short, high purity fibers reinforced with aluminum borosilicate fibers are used to manufacture the space shuttle tiles.

Accepted Answer

The answer of Short, high purity fibers reinforced with aluminum...

Question 12

are solid- state materials that can be made either semiconducting or metallic without any doping.

Accepted Answer

The answer of are solid- state materials that can be...

Question 13

Biocompatibility means that material is .

Accepted Answer

A)  made by biological methods 
B)  integratable into living organisms 
C)  made from biological material 
D)  biodegradable 
E)  none of the above 
A)  made by biological methods 
B)  integratable into living organisms 
C)  made from biological material 
D)  biodegradable 
E)  none of the above

Question 14

Superconductors exhibit the Meissner effect.

Accepted Answer

A) True 
 B)False

Question 15

Molecules with only single bonds do not generally exhibit liquid- crystalline properties because
)

Accepted Answer

A)  molecules without multiple bonds lack the flexibility necessary for alignment 
B)  molecules with only single bonds are gases 
C)  molecules without multiple bonds lack the rigidity necessary for alignment 
D)  molecules with only single bonds are too big to exhibit liquid- crystalline properties 
E)  molecules without multiple bonds are too small to exhibit liquid- crystalline properties 
A)  molecules without multiple bonds lack the flexibility necessary for alignment 
B)  molecules with only single bonds are gases 
C)  molecules without multiple bonds lack the rigidity necessary for alignment 
D)  molecules with only single bonds are too big to exhibit liquid- crystalline properties 
E)  molecules without multiple bonds are too small to exhibit liquid- crystalline properties

Question 16

A material is sintered by .

Accepted Answer

A)  sieving to achieve uniform particle size 
B)  finely dividing the solid 
C)  heating the finely divided solid to a high temperature under pressure 
D)  placing in the middle 
E)  heating with sulfur 
A)  sieving to achieve uniform particle size 
B)  finely dividing the solid 
C)  heating the finely divided solid to a high temperature under pressure 
D)  placing in the middle 
E)  heating with sulfur

Question 17

The monomer that is polymerized to make natural rubber is .

Accepted Answer

A)  ethylene 
B)  adipic acid 
C)  formaldehyde 
D)  melamine 
E)  isoprene 
A)  ethylene 
B)  adipic acid 
C)  formaldehyde 
D)  melamine 
E)  isoprene

Question 18

Which of the following is most likely to exhibit liquid- crystalline behavior?

Accepted Answer

A) 
  
B)  CH3CH2CH2CH2CH2CH2CH2CH3 
C)  CH3CH2CH2CH2CH2- Na+ 
D)  CH3CH2- C(CH3)2- CH2CH3 
E) 
  
A) 
  
B)  CH3CH2CH2CH2CH2CH2CH2CH3 
C)  CH3CH2CH2CH2CH2- Na+ 
D)  CH3CH2- C(CH3)2- CH2CH3 
E)

Question 19

A sample of natural rubber (200.0 g) is vulcanized, with the complete consumption of 4.8 g of sulfur. Natural rubber is a polymer of isoprene (C5H8). Four sulfur atoms are used in each crosslink connection. What percent of the isoprene units will be crosslinked?

Accepted Answer

A)  1.3 
B)  9.4 
C)  2.5 
D)  7.6 
E)  5.1 
A)  1.3 
B)  9.4 
C)  2.5 
D)  7.6 
E)  5.1

Question 20

The material first shown to exhibit what we now call superconductivity was _ .

Accepted Answer

A)  a metal 
B)  a composite 
C)  a ceramic 
D)  a polymer 
E)  a thin film 
A)  a metal 
B)  a composite 
C)  a ceramic 
D)  a polymer 
E)  a thin film

Exam 12: Modern Materials

are materials characterized by an energy gap between a filled valence band and an empty conduction band.

Which of the following is not a natural polymer? silk Starch protein cellulose nylon

Of the following, only is not a polymer. cellulose Nylon starch protein Stainless steel

A biomaterial intended for use as a long- term replacement of a blood vessel _ .

Of the following chemical forms, are not commonly found in ceramics.

Molecules containing only single bonds do not exhibit liquid- crystal behavior because free rotation can occur around single bonds making these molecules flexible.

Write the chemical formulas for both polyethylene and the monomer from which it is formed.

Which of the following is not a biopolymer? protein Polysaccharide polyurethane RNA DNA

An elastomer will fail to regain its original dimensions following a distortion beyond its

In what year was the first systematic work involving liquid crystals reported?

Short, high purity fibers reinforced with aluminum borosilicate fibers are used to manufacture the space shuttle tiles.

are solid- state materials that can be made either semiconducting or metallic without any doping.

Biocompatibility means that material is .

Superconductors exhibit the Meissner effect.

Molecules with only single bonds do not generally exhibit liquid- crystalline properties because )

A material is sintered by .

The monomer that is polymerized to make natural rubber is .

Which of the following is most likely to exhibit liquid- crystalline behavior?

A sample of natural rubber (200.0 g) is vulcanized, with the complete consumption of 4.8 g of sulfur. Natural rubber is a polymer of isoprene (C5H8). Four sulfur atoms are used in each crosslink connection. What percent of the isoprene units will be crosslinked?

The material first shown to exhibit what we now call superconductivity was _ .

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Stoichiometry: Calculations With Chemical Formulas and Equations

Aqueous Reactions and Solution Stoichiometry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Gases

Intermolecular Forces, Liquids, and Solids

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Chemistry of Coordination Compounds

The Chemistry of Life: Organic and Biological Chemistry

Filters

A sample of natural rubber (200.0 g) is vulcanized, with the complete consumption of 4.8 g of sulfur. Natural rubber is a polymer of isoprene (C₅H₈). Four sulfur atoms are used in each crosslink connection. What percent of the isoprene units will be crosslinked?