Question 1

Inorganic compounds that are semiconductors have an average of __________ valence electrons.

Accepted Answer

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

Question 2

The process of adding controlled amounts of impurity atoms to a material is known as __________.

Accepted Answer

The answer of The process of adding controlled amounts of...

Question 3

Natural rubber is too soft and chemically reactive for practical applications. Vulcanization of natural rubber entails __________.

Accepted Answer

A) conversion of an addition polymer to a condensation polymer 
B) conversion of a condensation polymer to an addition polymer 
C) increasing the average molecular weight of a condensation polymer 
D) decreasing the average molecular weight of an addition polymer 
E) crosslinking reactive polymer chains with sulfur atoms 
A) conversion of an addition polymer to a condensation polymer 
B) conversion of a condensation polymer to an addition polymer 
C) increasing the average molecular weight of a condensation polymer 
D) decreasing the average molecular weight of an addition polymer 
E) crosslinking reactive polymer chains with sulfur atoms

Question 4

For a substitutional alloy to form, the two metals combined must have similar

Accepted Answer

A) ionization potential and electron affinity. 
B) number of valance electrons and electronegativity. 
C) reduction potential and size. 
D) atomic radii and chemical bonding properties. 
E) band gap and reactivity. 
A) ionization potential and electron affinity. 
B) number of valance electrons and electronegativity. 
C) reduction potential and size. 
D) atomic radii and chemical bonding properties. 
E) band gap and reactivity.

Question 5

Silicon technology is based on the fact that silicon oxide is a chemically stable conductor.

Accepted Answer

A) True 
 B)False

Question 6

In addition to differences in their average molecular mass, HDPE and LDPE differ in their degree of __________ and their __________ of the chains.

Accepted Answer

crystallin

Question 7

Metallic solids do not exhibit __________.

Accepted Answer

A) excellent thermal conductivity 
B) excellent electrical conductivity 
C) variable hardness 
D) extreme brittleness 
E) variable melting point 
A) excellent thermal conductivity 
B) excellent electrical conductivity 
C) variable hardness 
D) extreme brittleness 
E) variable melting point

Question 8

Which statement about steel is false?

Accepted Answer

A) It is a polymer. 
B) It is an alloy of iron. 
C) It can have different percentages of carbon. 
D) It can be made so it resists rust. 
E) none of the above 
A) It is a polymer. 
B) It is an alloy of iron. 
C) It can have different percentages of carbon. 
D) It can be made so it resists rust. 
E) none of the above

Question 9

The properties of graphene include __________.

Accepted Answer

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

Question 10

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

Question 11

An ionic solid, NaCl (s), dissolves in water because of the __________.

Accepted Answer

A) relatively low lattice energy due to small charges of Na+ and Cl- ions 
B) simple face-centered cubic unit cell type it forms 
C) 1:1 ratio of ions in the unit cell 
D) strong coulombic interactions between oppositely charged ions 
E) relatively low melting point 
A) relatively low lattice energy due to small charges of Na+ and Cl- ions 
B) simple face-centered cubic unit cell type it forms 
C) 1:1 ratio of ions in the unit cell 
D) strong coulombic interactions between oppositely charged ions 
E) relatively low melting point

Question 12

Which of the following is not a type of solid?

Accepted Answer

A) ionic 
B) molecular 
C) supercritical 
D) metallic 
E) covalent-network 
A) ionic 
B) molecular 
C) supercritical 
D) metallic 
E) covalent-network

Question 13

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 14

Which of the following is not an alloy?

Accepted Answer

A) brass 
B) steel 
C) sterling silver 
D) dental amalgam 
E) ceramic 
A) brass 
B) steel 
C) sterling silver 
D) dental amalgam 
E) ceramic

Question 15

Which one of the following is a property of most metals?

Accepted Answer

A) low melting point 
B) brittleness 
C) high electronegativity 
D) thermal conductivity 
E) acidic oxides 
A) low melting point 
B) brittleness 
C) high electronegativity 
D) thermal conductivity 
E) acidic oxides

Question 16

When lattice points occur at the corners and at the center of a unit cell, the cell is called __________.

Accepted Answer

The answer of When lattice points occur at the corners...

Question 17

Steel is

Accepted Answer

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

Question 18

__________ solids consist of atoms or molecules held together by dipole-dipole forces, London dispersion forces, and/or hydrogen bonds.

Accepted Answer

A) Ionic 
B) Molecular 
C) Metallic 
D) Covalent-network 
E) Metallic and covalent-network 
A) Ionic 
B) Molecular 
C) Metallic 
D) Covalent-network 
E) Metallic and covalent-network

Question 19

When lattice points occur at the center of each face, as well as each corner of a unit cell, the cell is called __________.

Accepted Answer

The answer of When lattice points occur at the center...

Question 20

When lattice points occur only at the corners of a unit cell, the cell is called __________.

Accepted Answer

The answer of When lattice points occur only at the...

Exam 12: Solids and Modern Materials

Inorganic compounds that are semiconductors have an average of __________ valence electrons.

The process of adding controlled amounts of impurity atoms to a material is known as __________.

Natural rubber is too soft and chemically reactive for practical applications. Vulcanization of natural rubber entails __________.

For a substitutional alloy to form, the two metals combined must have similar

Silicon technology is based on the fact that silicon oxide is a chemically stable conductor.

In addition to differences in their average molecular mass, HDPE and LDPE differ in their degree of __________ and their __________ of the chains.

Metallic solids do not exhibit __________.

Which statement about steel is false?

The properties of graphene include __________.

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?

An ionic solid, NaCl (s), dissolves in water because of the __________.

Which of the following is not a type of solid?

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

Which of the following is not an alloy?

Which one of the following is a property of most metals?

When lattice points occur at the corners and at the center of a unit cell, the cell is called __________.

Steel is

__________ solids consist of atoms or molecules held together by dipole-dipole forces, London dispersion forces, and/or hydrogen bonds.

When lattice points occur at the center of each face, as well as each corner of a unit cell, the cell is called __________.

When lattice points occur only at the corners of a unit cell, the cell is called __________.

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Stoichiometry: Calculations With Chemical Formulas and Equations

Aqueous Reactions and Solution Stoichiometry

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

Filters

In addition to differences in their average molecular mass, HDPE and LDPE differ in their degree of and their of the chains.

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?