Question 1

For a face-centered cubic lattice, each lattice point located in the face of the unit cell is shared equally with _____ other cells.

Accepted Answer

A)  1 
B)  2 
C)  4 
D)  8 
A)  1 
B)  2 
C)  4 
D)  8

Question 2

The tetragonal crystal system minimally requires one four-fold rotation axis. Which of the following conditions on unit-cell edges and angles would satisfy this?

Accepted Answer

A)  a=b=c, a=b=g=90° 
B)  a=b¹c, a=b=g=90° 
C)  a=b=c, a=b=g¹90° 
D)  a and b 
E)  a and c 
A)  a=b=c, a=b=g=90° 
B)  a=b¹c, a=b=g=90° 
C)  a=b=c, a=b=g¹90° 
D)  a and b 
E)  a and c

Question 3

For a body-centered unit cell, each corner contributes _____ lattice points to the unit cell.

Accepted Answer

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

Question 4

Crystalline substances are _______. Amorphous substances are _______.

Accepted Answer

A)  Isotropic, isotropic 
B)  Anisotropic, anisotropic. 
C)  Isotropic, anisotropic. 
D)  Anisotropic, isotropic. 
A)  Isotropic, isotropic 
B)  Anisotropic, anisotropic. 
C)  Isotropic, anisotropic. 
D)  Anisotropic, isotropic.

Question 5

Which of the following is a metalloid?

Accepted Answer

A)  Al 
B)  Ge 
C)  As 
D)  All of the above 
E)  None of the above 
A)  Al 
B)  Ge 
C)  As 
D)  All of the above 
E)  None of the above

Question 6

An element crystallizes in a body-centered cubic lattice, with a = 4.109 Å. If the element has a density of 9.95 g·cm-3, what is the molar mass of the element?

Accepted Answer

A)  104 g·mol-1 
B)  208 g·mol-1 
C)  416 g·mol-1 
D)  831 g·mol-1 
A)  104 g·mol-1 
B)  208 g·mol-1 
C)  416 g·mol-1 
D)  831 g·mol-1

Question 7

Exhibit 21-3
The following question(s) pertain to Iron which has a body-centered cubic unit cell. It has a molar mass of 55.847 g·mol-1 and a density of 7.86 g·cm-3.
Refer to Exhibit 21-3. How many atoms are contained within a single iron unit cell?

Accepted Answer

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

Question 8

Frenkel defects are a result of

Accepted Answer

A)  vacancies in the crystal lattice 
B)  atoms inserted at interstitial sites 
C)  electron transfer 
D)  p-bonding interactions at the surface 
E)  a and b 
A)  vacancies in the crystal lattice 
B)  atoms inserted at interstitial sites 
C)  electron transfer 
D)  p-bonding interactions at the surface 
E)  a and b

Question 9

Which of the following has 3 non-identical 2-fold rotation axes?

Accepted Answer

A)  A cereal box 
B)  A five pointed star 
C)  A cube 
D)  An isosceles triangle 
E)  An equilateral triangle 
A)  A cereal box 
B)  A five pointed star 
C)  A cube 
D)  An isosceles triangle 
E)  An equilateral triangle

Question 10

Exhibit 21-2
The following question(s) pertain to Palladium which has a face-centered cubic unit cell. It has a molar mass of 106.4 g·mol-1 and a density of 7.14 g·cm-3.
Refer to Exhibit 21-2. How many atoms are contained within a single palladium unit cell?

Accepted Answer

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

Question 11

Molecular crystals are

Accepted Answer

A)  soft and malleable 
B)  hard and brittle 
C)  have low melting points 
D)  a and c 
E)  b and c 
A)  soft and malleable 
B)  hard and brittle 
C)  have low melting points 
D)  a and c 
E)  b and c

Question 12

When two metal atoms are brought close together

Accepted Answer

A)  an electron is transferred from one atom to the next resulting in a coulombic attraction. 
B)  all of the electrons are shared between the two atoms. 
C)  Groups of closely spaced molecular orbitals are formed. 
D)  b and c 
E)  none of the above 
A)  an electron is transferred from one atom to the next resulting in a coulombic attraction. 
B)  all of the electrons are shared between the two atoms. 
C)  Groups of closely spaced molecular orbitals are formed. 
D)  b and c 
E)  none of the above

Question 13

Alloy steels can be described as

Accepted Answer

A)  substitutional 
B)  amorphous 
C)  interstitial 
D)  A and B 
E)  A and C 
A)  substitutional 
B)  amorphous 
C)  interstitial 
D)  A and B 
E)  A and C

For a face-centered cubic lattice, each lattice point located in the face of the unit cell is shared equally with _____ other cells.

The tetragonal crystal system minimally requires one four-fold rotation axis. Which of the following conditions on unit-cell edges and angles would satisfy this?

For a body-centered unit cell, each corner contributes _____ lattice points to the unit cell.

Crystalline substances are _. Amorphous substances are _.

Which of the following is a metalloid?

An element crystallizes in a body-centered cubic lattice, with a = 4.109 Å. If the element has a density of 9.95 g·cm^-³, what is the molar mass of the element?

Exhibit 21-3 The following question(s) pertain to Iron which has a body-centered cubic unit cell. It has a molar mass of 55.847 g·mol^-¹and a density of 7.86 g·cm^-³. Refer to Exhibit 21-3. How many atoms are contained within a single iron unit cell?

Frenkel defects are a result of

Which of the following has 3 non-identical 2-fold rotation axes?

Exhibit 21-2 The following question(s) pertain to Palladium which has a face-centered cubic unit cell. It has a molar mass of 106.4 g·mol^-¹and a density of 7.14 g·cm^-³. Refer to Exhibit 21-2. How many atoms are contained within a single palladium unit cell?

Molecular crystals are

When two metal atoms are brought close together

Alloy steels can be described as

The Atom in Modern Chemistry

Chemical Formulas, Equations, and Reaction Yields

Chemical Bonding: the Classical Description

Introduction to Quantum Mechanics

Quantum Mechanics and Atomic Structure

Quantum Mechanics and Molecular Structure

Bonding in Organic Molecules

Binding in Transition Metal Compounds and Coordination Complexes

The Gaseous State

Solids, Liquids, and Phase Transitions

Solutions

Thermodynamic Processes and Thermochemistry

Spontaneous Processes and Thermodynamic Equilibrium

Chemical Equilibrium

Acid-Base Equilibria

Solubility and Precipitation Equilibria

Electrochemistry

Chemical Kinetics

Nuclear Chemistry

Molecular Spectroscopy and Photochemistry

Inorganic Materials

Polymeric Materials and Soft Condensed Matter

Filters

Exam 21: Structure and Bonding in Solids

For a face-centered cubic lattice, each lattice point located in the face of the unit cell is shared equally with _____ other cells.

The tetragonal crystal system minimally requires one four-fold rotation axis. Which of the following conditions on unit-cell edges and angles would satisfy this?

For a body-centered unit cell, each corner contributes _____ lattice points to the unit cell.

Crystalline substances are _______. Amorphous substances are _______.

Which of the following is a metalloid?

An element crystallizes in a body-centered cubic lattice, with a = 4.109 Å. If the element has a density of 9.95 g·cm-3, what is the molar mass of the element?

Exhibit 21-3 The following question(s) pertain to Iron which has a body-centered cubic unit cell. It has a molar mass of 55.847 g·mol-1 and a density of 7.86 g·cm-3. Refer to Exhibit 21-3. How many atoms are contained within a single iron unit cell?

Frenkel defects are a result of

Which of the following has 3 non-identical 2-fold rotation axes?

Exhibit 21-2 The following question(s) pertain to Palladium which has a face-centered cubic unit cell. It has a molar mass of 106.4 g·mol-1 and a density of 7.14 g·cm-3. Refer to Exhibit 21-2. How many atoms are contained within a single palladium unit cell?

Molecular crystals are

When two metal atoms are brought close together

Alloy steels can be described as

The Atom in Modern Chemistry

Chemical Formulas, Equations, and Reaction Yields

Chemical Bonding: the Classical Description

Introduction to Quantum Mechanics

Quantum Mechanics and Atomic Structure

Quantum Mechanics and Molecular Structure

Bonding in Organic Molecules

Binding in Transition Metal Compounds and Coordination Complexes

The Gaseous State

Solids, Liquids, and Phase Transitions

Solutions

Thermodynamic Processes and Thermochemistry

Spontaneous Processes and Thermodynamic Equilibrium

Chemical Equilibrium

Acid-Base Equilibria

Solubility and Precipitation Equilibria

Electrochemistry

Chemical Kinetics

Nuclear Chemistry

Molecular Spectroscopy and Photochemistry

Inorganic Materials

Polymeric Materials and Soft Condensed Matter

Filters

Crystalline substances are _. Amorphous substances are _.

An element crystallizes in a body-centered cubic lattice, with a = 4.109 Å. If the element has a density of 9.95 g·cm^-³, what is the molar mass of the element?

Exhibit 21-3 The following question(s) pertain to Iron which has a body-centered cubic unit cell. It has a molar mass of 55.847 g·mol^-¹and a density of 7.86 g·cm^-³. Refer to Exhibit 21-3. How many atoms are contained within a single iron unit cell?

Exhibit 21-2 The following question(s) pertain to Palladium which has a face-centered cubic unit cell. It has a molar mass of 106.4 g·mol^-¹and a density of 7.14 g·cm^-³. Refer to Exhibit 21-2. How many atoms are contained within a single palladium unit cell?