Question 1

Palladium crystallizes in a face-centered cubic unit cell.If the edge length of the unit cell is 387 pm,what is the radius of a palladium atom in picometers?

Accepted Answer

A)  137 pm 
B)  548 pm 
C)  1100 pm 
D)  316 pm 
E)  48.4 pm 
A)  137 pm 
B)  548 pm 
C)  1100 pm 
D)  316 pm 
E)  48.4 pm A

Question 2

Sodium chloride crystallizes in a(n)_____ cubic unit cell with chloride ions occupying the lattice points.The sodium ions occupy interstitial regions,with each cation in contact with six chloride ions.

Accepted Answer

face-centered

Question 3

Which of the following statements is true about semiconductors?

Accepted Answer

A)  Pure silicon and germanium are called intrinsic semiconductors. 
B)  In extrinsic semiconductors,the number of electrons in the conduction band is determined by the temperature and the magnitude of the band gap. 
C)  Dopants are present in intrinsic semiconductors. 
D)  The conductivity of intrinsic semiconductors is controlled by adding small numbers of different atoms. 
E)  The types of intrinsic semiconductors include p-type and n-type semiconductors. 
A)  Pure silicon and germanium are called intrinsic semiconductors. 
B)  In extrinsic semiconductors,the number of electrons in the conduction band is determined by the temperature and the magnitude of the band gap. 
C)  Dopants are present in intrinsic semiconductors. 
D)  The conductivity of intrinsic semiconductors is controlled by adding small numbers of different atoms. 
E)  The types of intrinsic semiconductors include p-type and n-type semiconductors. A

Question 4

Strontium oxide has a face-centered cubic unit cell of oxide ions with the strontium in octahedral holes.If the radius of Sr2+ is 127 pm and the density of SrO is 4.7 g/cm3,what is the radius of the oxide ion? (100 cm = 1 × 1012 pm)

Accepted Answer

A)  176 pm 
B)  132 pm 
C)  127 pm 
D)  137 pm 
E)  273 pm 
A)  176 pm 
B)  132 pm 
C)  127 pm 
D)  137 pm 
E)  273 pm

Question 5

The metal vanadium crystallizes in a body-centered cubic lattice.If the density of vanadium is 6.11 g/cm3,what is the atomic radius of vanadium?

Accepted Answer

A)  25.3 pm 
B)  104 pm 
C)  35.3 pm 
D)  31.9 pm 
E)  131 pm 
A)  25.3 pm 
B)  104 pm 
C)  35.3 pm 
D)  31.9 pm 
E)  131 pm

Question 6

Which equation represents the number of atoms in a body-centered cubic unit cell?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 7

If an ionic solid has a face-centered cubic lattice of anions (Xn−)and all the octahedral holes are occupied by metal cations (Mm+),what is the formula for the compound?

Accepted Answer

A)  M2X 
B)  MX 
C)  MX2 
D)  M2X3 
E)  M3X2 
A)  M2X 
B)  MX 
C)  MX2 
D)  M2X3 
E)  M3X2

Question 8

Which of the following ionic compounds is expected to have the lowest enthalpy of fusion?

Accepted Answer

A)  NaI 
B)  NaCl 
C)  NaBr 
D)  NaF 
E)  None of these 
A)  NaI 
B)  NaCl 
C)  NaBr 
D)  NaF 
E)  None of these

Question 9

Which of the following compounds is expected to have the strongest ionic bonds?

Accepted Answer

A)  RbI 
B)  KCl 
C)  NaBr 
D)  CsF 
E)  LiF 
A)  RbI 
B)  KCl 
C)  NaBr 
D)  CsF 
E)  LiF

Question 10

Arrange the three common cubic unit cells in order from least dense to most dense packing.

Accepted Answer

A)  Face-centered cubic < body-centered cubic < primitive cubic 
B)  Primitive cubic < body-centered cubic < face-centered cubic 
C)  Primitive cubic < face-centered cubic < body-centered cubic 
D)  Body-centered cubic < primitive cubic < face-centered cubic 
E)  Body-centered cubic < face-centered cubic < primitive cubic 
A)  Face-centered cubic < body-centered cubic < primitive cubic 
B)  Primitive cubic < body-centered cubic < face-centered cubic 
C)  Primitive cubic < face-centered cubic < body-centered cubic 
D)  Body-centered cubic < primitive cubic < face-centered cubic 
E)  Body-centered cubic < face-centered cubic < primitive cubic

Question 11

Which of the following compounds is expected to have the strongest ionic bonds?

Accepted Answer

A)  MgO 
B)  KBr 
C)  NaI 
D)  BaO 
E)  SrS 
A)  MgO 
B)  KBr 
C)  NaI 
D)  BaO 
E)  SrS

Question 12

Point D on the phase diagram is referred to as the _____ point.

Accepted Answer

A)  triple 
B)  normal boiling 
C)  critical 
D)  normal freezing 
E)  divergent 
A)  triple 
B)  normal boiling 
C)  critical 
D)  normal freezing 
E)  divergent

Question 13

Cesium crystallizes in the body-centered cubic system.If the edge of the unit cell is 612 pm,what is the radius of a cesium atom in picometers?

Accepted Answer

A)  265 pm 
B)  1060 pm 
C)  1410 pm 
D)  1220 pm 
E)  115 pm 
A)  265 pm 
B)  1060 pm 
C)  1410 pm 
D)  1220 pm 
E)  115 pm

Question 14

Which one of the following substances is incorrectly matched with the kind of solid it forms? Substance/Kind of Solid

Accepted Answer

A)  sulfur dioxide/molecular 
B)  graphite/covalent 
C)  calcium bromide/ionic 
D)  iron/ionic 
E)  methane/molecular 
A)  sulfur dioxide/molecular 
B)  graphite/covalent 
C)  calcium bromide/ionic 
D)  iron/ionic 
E)  methane/molecular

Question 15

The bandgap of ZnTe is 218 kJ/mol.What is the maximum wavelength of light that can excite an electron transition across the band gap? (h = 6.626 × 10-34 J·s; c = 3.000 × 108 m/s)

Accepted Answer

A)  551 nm 
B)  549.0 nm 
C)  7298 nm 
D)  873.7 nm 
E)  517 nm 
A)  551 nm 
B)  549.0 nm 
C)  7298 nm 
D)  873.7 nm 
E)  517 nm

Question 16

The metal sodium crystallizes in a body-centered cubic lattice.If the density of sodium is 0.968 g/cm3,what is the unit cell edge length?

Accepted Answer

A)  429 pm 
B)  51.9 pm 
C)  151​​ pm 
D)  41.2 pm 
E)  340​​ pm 
A)  429 pm 
B)  51.9 pm 
C)  151​​ pm 
D)  41.2 pm 
E)  340​​ pm

Question 17

If an ionic compound with the formula MX forms a primitive cubic unit cell with the anions (Xn-)at the lattice points,the cations (M2n+)will occupy:

Accepted Answer

A)  all of the tetrahedral holes in each unit cell. 
B)  half of the tetrahedral holes in each unit cell. 
C)  the cubic hole in the center of each unit cell. 
D)  the center of each face in each unit cell. 
E)  all of the octahedral holes in each unit cell. 
A)  all of the tetrahedral holes in each unit cell. 
B)  half of the tetrahedral holes in each unit cell. 
C)  the cubic hole in the center of each unit cell. 
D)  the center of each face in each unit cell. 
E)  all of the octahedral holes in each unit cell.

Question 18

In metals,there are not enough electrons to fill all of the electronic energy levels.At 0 K,the highest energy level filled is referred to as the ________.

Accepted Answer

A)  valence band 
B)  conduction band 
C)  triple point 
D)  Fermi level 
E)  band gap 
A)  valence band 
B)  conduction band 
C)  triple point 
D)  Fermi level 
E)  band gap

Question 19

Which one of the following statements is incorrect?

Accepted Answer

A)  Polonium is the only metal that has a primitive cubic lattice. 
B)  The lattice structure of the alkali metals is body-centered cubic. 
C)  Many metals can crystallize in more than one type of crystal lattice. 
D)  Metals with a body-centered cubic lattice contain a net of four metal atoms per unit cell. 
E)  A hexagonal close packed structure is not an example of a cubic unit cell. 
A)  Polonium is the only metal that has a primitive cubic lattice. 
B)  The lattice structure of the alkali metals is body-centered cubic. 
C)  Many metals can crystallize in more than one type of crystal lattice. 
D)  Metals with a body-centered cubic lattice contain a net of four metal atoms per unit cell. 
E)  A hexagonal close packed structure is not an example of a cubic unit cell.

Question 20

A sketch of a phase diagram is given below.   Which statement about this diagram is not true?

Accepted Answer

A)  Increasing pressure at constant temperature can melt the solid. 
B)  Increasing temperature at constant pressure can cause the solid to sublime. 
C)  Increasing temperature at constant pressure can cause the liquid to vaporize. 
D)  Increasing pressure at constant temperature can cause deposition of solid from gas. 
E)  Increasing pressure at constant temperature can cause liquid to freeze. 
A)  Increasing pressure at constant temperature can melt the solid. 
B)  Increasing temperature at constant pressure can cause the solid to sublime. 
C)  Increasing temperature at constant pressure can cause the liquid to vaporize. 
D)  Increasing pressure at constant temperature can cause deposition of solid from gas. 
E)  Increasing pressure at constant temperature can cause liquid to freeze.

Exam 13: The Solid State

Palladium crystallizes in a face-centered cubic unit cell.If the edge length of the unit cell is 387 pm,what is the radius of a palladium atom in picometers?

Sodium chloride crystallizes in a(n)_____ cubic unit cell with chloride ions occupying the lattice points.The sodium ions occupy interstitial regions,with each cation in contact with six chloride ions.

Which of the following statements is true about semiconductors?

Strontium oxide has a face-centered cubic unit cell of oxide ions with the strontium in octahedral holes.If the radius of Sr2+ is 127 pm and the density of SrO is 4.7 g/cm3,what is the radius of the oxide ion? (100 cm = 1 × 1012 pm)

The metal vanadium crystallizes in a body-centered cubic lattice.If the density of vanadium is 6.11 g/cm3,what is the atomic radius of vanadium?

Which equation represents the number of atoms in a body-centered cubic unit cell?

If an ionic solid has a face-centered cubic lattice of anions (Xn−)and all the octahedral holes are occupied by metal cations (Mm+),what is the formula for the compound?

Which of the following ionic compounds is expected to have the lowest enthalpy of fusion?

Which of the following compounds is expected to have the strongest ionic bonds?

Arrange the three common cubic unit cells in order from least dense to most dense packing.

Which of the following compounds is expected to have the strongest ionic bonds?

Point D on the phase diagram is referred to as the _____ point.

Cesium crystallizes in the body-centered cubic system.If the edge of the unit cell is 612 pm,what is the radius of a cesium atom in picometers?

Which one of the following substances is incorrectly matched with the kind of solid it forms? Substance/Kind of Solid

The bandgap of ZnTe is 218 kJ/mol.What is the maximum wavelength of light that can excite an electron transition across the band gap? (h = 6.626 × 10-34 J·s; c = 3.000 × 108 m/s)

The metal sodium crystallizes in a body-centered cubic lattice.If the density of sodium is 0.968 g/cm3,what is the unit cell edge length?

If an ionic compound with the formula MX forms a primitive cubic unit cell with the anions (Xn-)at the lattice points,the cations (M2n+)will occupy:

In metals,there are not enough electrons to fill all of the electronic energy levels.At 0 K,the highest energy level filled is referred to as the ________.

Which one of the following statements is incorrect?

A sketch of a phase diagram is given below. Which statement about this diagram is not true?

Basic Concepts of Chemistry

Lets Review: The Tools of Quantitative Chemistry

Atoms, molecules, and Ions

Chemical Reactions

Stoichiometry: Quantitative Information About Chemical Reactions

Principles of Chemical Reactivity: Energy and Chemical Reactions

The Structure of Atoms

The Structure of Atoms and Periodic Trends

Bonding and Molecular Structure

Bonding and Molecular Structure Orbital Hybridization and Molecular Orbitals

Gases and Their Properties

Intermolecular Forces and Liquids

Solutions and Their Behavior

Chemical Kinetics: the Rates of Chemical Reactions

Principles of Chemical Reactivity: Equilibria

Principles of Chemical Reactivity: the Chemistry of Acids and Bases

Principles of Chemical Reactivity: Other Aspects of Aqueous Equilibria

Principles of Chemical Reactivity: Entropy and Free Energy

Principles of Chemical Reactivity: Electron Transfer Reactions

Environmental Chemistry: Earths Environment, energy, and Sustainability

The Chemistry of the Main Group Elements

The Chemistry of the Transition Elements

Carbon: Not Just Another Element

Biochemistry

Nuclear Chemistry

Filters

Strontium oxide has a face-centered cubic unit cell of oxide ions with the strontium in octahedral holes.If the radius of Sr²⁺ is 127 pm and the density of SrO is 4.7 g/cm³,what is the radius of the oxide ion? (100 cm = 1 × 10¹² pm)

The metal vanadium crystallizes in a body-centered cubic lattice.If the density of vanadium is 6.11 g/cm³,what is the atomic radius of vanadium?

If an ionic solid has a face-centered cubic lattice of anions (Xn−)and all the octahedral holes are occupied by metal cations (Mm⁺),what is the formula for the compound?

The bandgap of ZnTe is 218 kJ/mol.What is the maximum wavelength of light that can excite an electron transition across the band gap? (h = 6.626 × 10^-34 J·s; c = 3.000 × 10⁸ m/s)

The metal sodium crystallizes in a body-centered cubic lattice.If the density of sodium is 0.968 g/cm³,what is the unit cell edge length?

If an ionic compound with the formula MX forms a primitive cubic unit cell with the anions (Xn^-)at the lattice points,the cations (M²ⁿ⁺)will occupy: