Question 1

Which of the following will have a larger band gap: GaN,GaP,GaAs,or GaSb?

Accepted Answer

A) GaAs 
B) GaP 
C) GaN 
D) GaSb 
E) All choices have identical band gaps. 
A) GaAs 
B) GaP 
C) GaN 
D) GaSb 
E) All choices have identical band gaps. C

Question 2

A face-centered cubic unit cell contains contains ________ atoms.

Accepted Answer

4

Question 3

What is an alloy?

Accepted Answer

a material that contains more than one element and has the characteristic properties of metals

Question 4

Which of the following lattices is one of the five two-dimensional lattices in which the lattice vectors a and b are equal and the γ angle between them is 90°?

Accepted Answer

A) hexagonal 
B) rectangular 
C) square 
D) rhombic 
E) oblique 
A) hexagonal 
B) rectangular 
C) square 
D) rhombic 
E) oblique

Question 5

Which of the following is an addition polymer?

Accepted Answer

A) polyethylene terephthalate 
B) polyurethane 
C) Nylon 6,6 
D) polyvinyl chloride 
E) polycarbonate 
A) polyethylene terephthalate 
B) polyurethane 
C) Nylon 6,6 
D) polyvinyl chloride 
E) polycarbonate

Question 6

An unknown metal crystallizes in a body-centered cubic structure with a unit cell edge length of 4.35 Å.The radius of the unknown atom is ________ Å.

Accepted Answer

A) 1.88 
B) 3.77 
C) 2.18 
D) 8.70 
E) 4.35 
A) 1.88 
B) 3.77 
C) 2.18 
D) 8.70 
E) 4.35

Question 7

An unknown metal crystallizes in a body-centered cubic unit cell.There are ________ atoms of the unknown metal per unit cell.

Accepted Answer

The answer of An unknown metal crystallizes in a body-centered...

Question 8

What is the correct abbreviation for the polymer low-density polyethylene?

Accepted Answer

A) P 
B) PP 
C) PETE 
D) LDPE 
E) HDPE 
A) P 
B) PP 
C) PETE 
D) LDPE 
E) HDPE

Question 9

The properties of graphene include ________.

Accepted Answer

A) large thermal conductivity 
B) high strength 
C) a zero energy gap 
D) A and B 
E) A, B and C 
A) large thermal conductivity 
B) high strength 
C) a zero energy gap 
D) A and B 
E) A, B and C

Question 10

What fraction of the volume of each corner atom is actually within the volume of a face-centered cubic unit cell?

Accepted Answer

A) 1 
B) 1/2 
C) 1/4 
D) 1/8 
E) 1/16 
A) 1 
B) 1/2 
C) 1/4 
D) 1/8 
E) 1/16

Question 11

The ________ for Ge shows it to be a semiconductor,because the gap between the filled lower and empty higher energy bands is relatively small.

Accepted Answer

A) molecular-orbital model 
B) quantum mechanics model 
C) atomic-orbital model 
D) valence bond model 
E) intermolecular model 
A) molecular-orbital model 
B) quantum mechanics model 
C) atomic-orbital model 
D) valence bond model 
E) intermolecular model

Question 12

Blue LEDs are usually made of ________.

Accepted Answer

A) gallium arsenide 
B) gallium phosphide 
C) gallium nitride 
D) gallium oxide 
E) gallium sulfide 
A) gallium arsenide 
B) gallium phosphide 
C) gallium nitride 
D) gallium oxide 
E) gallium sulfide

Question 13

Define a body-centered cubic lattice.

Accepted Answer

when lattice points

Question 14

All of the following are alloys except ________.

Accepted Answer

A) sterling silver 
B) 14-karat gold 
C) ceramic 
D) dental amalgam 
E) yellow brass 
A) sterling silver 
B) 14-karat gold 
C) ceramic 
D) dental amalgam 
E) yellow brass

Question 15

Which statement best describes the classification of Sterling silver?

Accepted Answer

A) It is pure silver. 
B) It is oxidized silver. 
C) It is an alloy of silver. 
D) It is a mixture of silver and gold. 
E) It is a liquid at room temperature. 
A) It is pure silver. 
B) It is oxidized silver. 
C) It is an alloy of silver. 
D) It is a mixture of silver and gold. 
E) It is a liquid at room temperature.

Question 16

Which category of plastics will generally be the most easily recycled?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Question 17

What is the percent gold in a 24 karat gold bracelet?

Accepted Answer

A) 100 
B) 24 
C) 75 
D) 25 
E) 76 
A) 100 
B) 24 
C) 75 
D) 25 
E) 76

Question 18

________ generally differ from compounds in that the atomic ratios of the constituent elements in the former are ________ and may vary over a wide range.

Accepted Answer

A) Pure metals, fixed 
B) Alloys, not fixed 
C) Pure metals, not fixed 
D) Alloys, fixed 
E) Solids, not fixed 
A) Pure metals, fixed 
B) Alloys, not fixed 
C) Pure metals, not fixed 
D) Alloys, fixed 
E) Solids, not fixed

Question 19

Which group of transition metals have the highest melting points?

Accepted Answer

A) 4B 
B) 6B 
C) 3B 
D) 2B 
E) 8B 
A) 4B 
B) 6B 
C) 3B 
D) 2B 
E) 8B

Question 20

________ are examples of homogeneous alloys.

Accepted Answer

A) Covalent compounds 
B) Interstitial compounds 
C) Intermetallic compounds 
D) Intrametallic compounds 
E) Ionic compounds. 
A) Covalent compounds 
B) Interstitial compounds 
C) Intermetallic compounds 
D) Intrametallic compounds 
E) Ionic compounds.

Exam 12: Solids and Modern Materials

Which of the following will have a larger band gap: GaN,GaP,GaAs,or GaSb?

A face-centered cubic unit cell contains contains ________ atoms.

What is an alloy?

Which of the following lattices is one of the five two-dimensional lattices in which the lattice vectors a and b are equal and the γ angle between them is 90°?

Which of the following is an addition polymer?

An unknown metal crystallizes in a body-centered cubic structure with a unit cell edge length of 4.35 Å.The radius of the unknown atom is ________ Å.

An unknown metal crystallizes in a body-centered cubic unit cell.There are ________ atoms of the unknown metal per unit cell.

What is the correct abbreviation for the polymer low-density polyethylene?

The properties of graphene include ________.

What fraction of the volume of each corner atom is actually within the volume of a face-centered cubic unit cell?

The ________ for Ge shows it to be a semiconductor,because the gap between the filled lower and empty higher energy bands is relatively small.

Blue LEDs are usually made of ________.

Define a body-centered cubic lattice.

All of the following are alloys except ________.

Which statement best describes the classification of Sterling silver?

Which category of plastics will generally be the most easily recycled?

What is the percent gold in a 24 karat gold bracelet?

________ generally differ from compounds in that the atomic ratios of the constituent elements in the former are ________ and may vary over a wide range.

Which group of transition metals have the highest melting points?

________ are examples of homogeneous alloys.

Introduction: Matter, energy, and Measurement

Atoms, molecules, and Ions

Chemical Reactions and Reaction Stoichiometry

Reactions in Aqueous Solution

Thermochemistry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Molecular Geometry and Bonding Theories

Gases

Liquids and Intermolecular Forces

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Aqueous Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Transition Metals and Coordination Chemistry

The Chemistry of Life: Organic and Biological Chemistry

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generally differ from compounds in that the atomic ratios of the constituent elements in the former are and may vary over a wide range.