Question 1

Nonstoichiometric compounds can contain

Accepted Answer

A)  different atomic elements that are not in whole number proportions to each other. 
B)  identical atoms with different oxidation states. 
C)  species that, upon reaction, always produce less than the theoretical yield. 
D)  A and B only 
E)  none of the above 
A)  different atomic elements that are not in whole number proportions to each other. 
B)  identical atoms with different oxidation states. 
C)  species that, upon reaction, always produce less than the theoretical yield. 
D)  A and B only 
E)  none of the above D

Question 2

For a face-centered cubic lattice, each lattice point located in the corner 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 D

Question 3

Assuming that atoms are solid spheres, what percentage of space is consumed by the atoms in the body-centered cubic primitive cell?

Accepted Answer

A)  48% 
B)  52% 
C)  68% 
D)  26% 
E)  74% 
A)  48% 
B)  52% 
C)  68% 
D)  26% 
E)  74% C

Question 4

Covalent 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 5

Schottky 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 6

Which of the following has the most mirror planes?

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 7

Exhibit 21-1
The following question(s) pertain to Gallium which has a simple cubic unit cell. It has a molar mass of 69.72 g·mol-1 and a density of 5.91 g·cm-3.
Refer to Exhibit 21-1. What is the diameter of a single Gallium atom?

Accepted Answer

A)  2.70 Å 
B)  1.35 Å 
C)  1.63 Å 
D)  2.44 Å 
A)  2.70 Å 
B)  1.35 Å 
C)  1.63 Å 
D)  2.44 Å

Question 8

Exhibit 21-1
The following question(s) pertain to Gallium which has a simple cubic unit cell. It has a molar mass of 69.72 g·mol-1 and a density of 5.91 g·cm-3.
Refer to Exhibit 21-1. How many atoms are contained within a single Gallium 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 9

The hybridization of carbon in graphite is ______ while in diamond it is _______.

Accepted Answer

A)  sp2, sp2 
B)  sp2, sp3 
C)  sp2, sp3d 
D)  sp3, sp3d2 
E)  None of the above 
A)  sp2, sp2 
B)  sp2, sp3 
C)  sp2, sp3d 
D)  sp3, sp3d2 
E)  None of the above

Question 10

Amorphous solids may have the following:

Accepted Answer

A)  ionic bonding 
B)  metallic bonding 
C)  covalent bonding 
D)  molecular bonding 
E)  all of the above 
A)  ionic bonding 
B)  metallic bonding 
C)  covalent bonding 
D)  molecular bonding 
E)  all of the above

Question 11

Of the seven crystal systems, which has the lowest symmetry requirements?

Accepted Answer

A)  hexagonal 
B)  cubic 
C)  triclinic 
D)  tetragonal 
E)  orthorhombic 
A)  hexagonal 
B)  cubic 
C)  triclinic 
D)  tetragonal 
E)  orthorhombic

Question 12

Assuming that atoms are solid spheres, what amount of free space is found in the face-centered cubic primitive cell?

Accepted Answer

A)  48% 
B)  52% 
C)  68% 
D)  26% 
E)  32% 
A)  48% 
B)  52% 
C)  68% 
D)  26% 
E)  32%

Question 13

Which of the following is not an acceptable location for an atom in a side-centered primitive cell?

Accepted Answer

A)  (1,1,0) 
B)  (1, 1/2 ,0) 
C)  $(1 / 2,1 / 2,1 / 2)$ 
D)  all of the above 
E)  none of the above 
A)  (1,1,0) 
B)  (1, 1/2 ,0) 
C)  $(1 / 2,1 / 2,1 / 2)$ 
D)  all of the above 
E)  none of the above

Question 14

Which of the following has exactly one two-fold rotation axis?

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 15

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. What is the radius of a single iron atom?

Accepted Answer

A)  2.55 Å 
B)  1.24 Å 
C)  1.94 Å 
D)  1.05 Å 
A)  2.55 Å 
B)  1.24 Å 
C)  1.94 Å 
D)  1.05 Å

Question 16

Molecular crystals are held in lattice sites by

Accepted Answer

A)  covalent bonds. 
B)  ionic bonds. 
C)  intermolecular forces. 
D)  large molecular orbitals that span many lattice sites. 
E)  a and c 
A)  covalent bonds. 
B)  ionic bonds. 
C)  intermolecular forces. 
D)  large molecular orbitals that span many lattice sites. 
E)  a and c

Question 17

Which of the following have the same number of rotation axes and mirror planes?

Accepted Answer

A)  Cereal box and a cube 
B)  A five pointed star and an isosceles triangle 
C)  An isosceles triangle and a five pointed star 
D)  A pentagon and an isosceles triangle 
E)  A pentagon and a five pointed star 
A)  Cereal box and a cube 
B)  A five pointed star and an isosceles triangle 
C)  An isosceles triangle and a five pointed star 
D)  A pentagon and an isosceles triangle 
E)  A pentagon and a five pointed star

Question 18

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. What is the radius of a single palladium atom?

Accepted Answer

A)  2.70 Å 
B)  1.22 Å 
C)  1.64 Å 
D)  2.44 Å 
A)  2.70 Å 
B)  1.22 Å 
C)  1.64 Å 
D)  2.44 Å

Question 19

Assuming that atoms are solid spheres, what percentage of space is consumed by the atoms in the simple cubic primitive cell?

Accepted Answer

A)  48% 
B)  52% 
C)  68% 
D)  26% 
E)  32% 
A)  48% 
B)  52% 
C)  68% 
D)  26% 
E)  32%

Question 20

In crystalline sodium the distance between adjacent layers in a certain set of equally spaced planes of atoms is 4.28 Å. What is the maximum order n for observation of Bragg diffraction using X-rays with a wavelength of 1.936 Å?

Accepted Answer

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

Exam 21: Structure and Bonding in Solids

Nonstoichiometric compounds can contain

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

Assuming that atoms are solid spheres, what percentage of space is consumed by the atoms in the body-centered cubic primitive cell?

Covalent crystals are

Schottky defects are a result of

Which of the following has the most mirror planes?

Exhibit 21-1 The following question(s) pertain to Gallium which has a simple cubic unit cell. It has a molar mass of 69.72 g·mol-1 and a density of 5.91 g·cm-3. Refer to Exhibit 21-1. What is the diameter of a single Gallium atom?

Exhibit 21-1 The following question(s) pertain to Gallium which has a simple cubic unit cell. It has a molar mass of 69.72 g·mol-1 and a density of 5.91 g·cm-3. Refer to Exhibit 21-1. How many atoms are contained within a single Gallium unit cell?

The hybridization of carbon in graphite is ______ while in diamond it is _______.

Amorphous solids may have the following:

Of the seven crystal systems, which has the lowest symmetry requirements?

Assuming that atoms are solid spheres, what amount of free space is found in the face-centered cubic primitive cell?

Which of the following is not an acceptable location for an atom in a side-centered primitive cell?

Which of the following has exactly one two-fold rotation axis?

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. What is the radius of a single iron atom?

Molecular crystals are held in lattice sites by

Which of the following have the same number of rotation axes and mirror planes?

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. What is the radius of a single palladium atom?

Assuming that atoms are solid spheres, what percentage of space is consumed by the atoms in the simple cubic primitive cell?

In crystalline sodium the distance between adjacent layers in a certain set of equally spaced planes of atoms is 4.28 Å. What is the maximum order n for observation of Bragg diffraction using X-rays with a wavelength of 1.936 Å?

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

Exhibit 21-1 The following question(s) pertain to Gallium which has a simple cubic unit cell. It has a molar mass of 69.72 g·mol^-¹and a density of 5.91 g·cm^-³. Refer to Exhibit 21-1. What is the diameter of a single Gallium atom?

Exhibit 21-1 The following question(s) pertain to Gallium which has a simple cubic unit cell. It has a molar mass of 69.72 g·mol^-¹and a density of 5.91 g·cm^-³. Refer to Exhibit 21-1. How many atoms are contained within a single Gallium unit cell?

The hybridization of carbon in graphite is while in diamond it is _.

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. What is the radius of a single iron atom?

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. What is the radius of a single palladium atom?