Question 1

Based on intermolecular forces, which organic compound should have the highest boiling point?

Accepted Answer

A)  Ethanol   
B)  Propane   
C)  Acetone   
D)  Propanol   
E)  Hexane   
A)  Ethanol   
B)  Propane   
C)  Acetone   
D)  Propanol   
E)  Hexane   D

Question 2

Of the three cubic unit cells, which lattice packing leaves the least amount of free space in the cell?

Accepted Answer

A)  simple cubic 
B)  need cell dimensions to determine this 
C)  body centered cubic 
D)  face centered cubic 
A)  simple cubic 
B)  need cell dimensions to determine this 
C)  body centered cubic 
D)  face centered cubic D

Question 3

The structure for CaF2 can be described as a face-centered array of Ca2+ ions with F- ions in the tetrahedral holes. The edge length of the unit cell is 5.45 *10-8 cm.
A) What fraction of the tetrahedral holes must be occupied by F- ions?
B) Calculate the density of CaF2.
C) If the ionic radius of F- is 1.36 * 10-8 cm, estimate the ionic radius of Ca2+. Tetrahedral holes are located along the body diagonals of each unit cell so that 1/4 (body diagonal) = rCa2+ + rF-.

Accepted Answer

A) All tetrahedral holes are filled for the required 2:1 stoichiometry. B) 3.20 g/cm³ C) 9.9 * 10^-⁹ cm

Question 4

Identify the major attractive force in Ne.

Accepted Answer

A)  ionic bonding 
B)  dipole-dipole interactions 
C)  London dispersion forces 
D)  hydrogen bonding 
E)  none of these 
A)  ionic bonding 
B)  dipole-dipole interactions 
C)  London dispersion forces 
D)  hydrogen bonding 
E)  none of these

Question 5

Which of the following is the correct order of boiling points for NaNO3, C2H5OH, C2H6, and Ne?

Accepted Answer

A)  Ne 2H6 3 2H5OH 
B)  Ne 2H6 2H5OH 3 
C)  Ne 2H5OH 2H6 3 
D)  NaNO3 2H5OH 2H6 2H6 2H5OH 3 
A)  Ne 2H6 3 2H5OH 
B)  Ne 2H6 2H5OH 3 
C)  Ne 2H5OH 2H6 3 
D)  NaNO3 2H5OH 2H6 2H6 2H5OH 3

Question 6

When 1.00 mol of a pure liquid is vaporized at a constant pressure of 1.06 atm and at its boiling point of 313.4 K, 30.00 kJ of energy (heat) is absorbed and the volume change is +25.80 L. What is F1F1F1S1F1F1F10H for this process? (1 L-atm = 101.3 J)

Accepted Answer

A)  -32.77 kJ 
B)  32.77 kJ 
C)  27.23 kJ 
D)  -27.23 kJ 
E)  30.00 kJ 
A)  -32.77 kJ 
B)  32.77 kJ 
C)  27.23 kJ 
D)  -27.23 kJ 
E)  30.00 kJ

Question 7

Which of the following is most likely to be a gas at room temperature?

Accepted Answer

A)  H2O 
B)  C8H18 
C)  K2S 
D)  O2 
E)  MgF2 
A)  H2O 
B)  C8H18 
C)  K2S 
D)  O2 
E)  MgF2

Question 8

Which substance can be described as cations bonded together by mobile electrons?

Accepted Answer

A)  S8(s) 
B)  Ag(s) 
C)  Kr(l) 
D)  HCl(l) 
E)  KCl(s) 
A)  S8(s) 
B)  Ag(s) 
C)  Kr(l) 
D)  HCl(l) 
E)  KCl(s)

Question 9

Which substance involves no intermolecular forces except London dispersion forces?

Accepted Answer

A)  NaF 
B)  N2 
C)  HF 
D)  H2S 
E)  K 
A)  NaF 
B)  N2 
C)  HF 
D)  H2S 
E)  K

Question 10

In cubic closest-packed solids, what percentage of space is occupied by the spheres?

Accepted Answer

A)  68.0% 
B)  74.0% 
C)  52.4% 
D)  43.8% 
E)  none of these 
A)  68.0% 
B)  74.0% 
C)  52.4% 
D)  43.8% 
E)  none of these

Question 11

The resistance of a liquid to an increase in its surface area is called

Accepted Answer

A)  capillary action. 
B)  viscosity. 
C)  surface tension. 
D)  vapor pressure 
E)  none of these 
A)  capillary action. 
B)  viscosity. 
C)  surface tension. 
D)  vapor pressure 
E)  none of these

Question 12

Properties of liquids lie (closer to/further from) properties of a solid than to (or from) properties of a gas.

Accepted Answer

A)  closer to 
B)  further from 
A)  closer to 
B)  further from

Question 13

A certain substance has the phase diagram shown below. At which of the following values of T and P is the substance a pure liquid?

Accepted Answer

A)  T = 70°C, P = 1.2 atm 
B)  T = 10°C, P = 1 atm 
C)  T = 8°C, P = 1 atm 
D)  T = 10°C, P = 0.5 atm 
E)  T = 80°C, P = 1 atm 
A)  T = 70°C, P = 1.2 atm 
B)  T = 10°C, P = 1 atm 
C)  T = 8°C, P = 1 atm 
D)  T = 10°C, P = 0.5 atm 
E)  T = 80°C, P = 1 atm

Question 14

Which of the following processes must exist in equilibrium with the condensation process when a measurement of vapor pressure is made?

Accepted Answer

A)  evaporation 
B)  fusion 
C)  sublimation 
D)  boiling 
E)  none of these 
A)  evaporation 
B)  fusion 
C)  sublimation 
D)  boiling 
E)  none of these

Question 15

When 1.00 mol of a pure liquid is vaporized at a constant pressure of 1.00 atm and at its boiling point of 330.8 K, 31.86 kJ of energy (heat) is absorbed and the volume change is +25.32 L. What is F1F1F1S1F1F1F10E for this process? (1 L-atm = 101.3 J)

Accepted Answer

A)  29.30 kJ 
B)  34.42 kJ 
C)  -34.42 kJ 
D)  -2.53 F1F1F1S1F1F1F10 103 kJ 
E)  -29.30 kJ 
A)  29.30 kJ 
B)  34.42 kJ 
C)  -34.42 kJ 
D)  -2.53 F1F1F1S1F1F1F10 103 kJ 
E)  -29.30 kJ

Question 16

The triple point of a substance is

Accepted Answer

A)  the point at which the vapor pressure of the solid is 1 atm. 
B)  the point at which its solid, liquid, and vapor are all in equilibrium. 
C)  the point at which the liquid starts to condense as the temperature of the vapor is lowered. 
D)  the point at which the density of the solid and the liquid are equal. 
E)  none of these 
A)  the point at which the vapor pressure of the solid is 1 atm. 
B)  the point at which its solid, liquid, and vapor are all in equilibrium. 
C)  the point at which the liquid starts to condense as the temperature of the vapor is lowered. 
D)  the point at which the density of the solid and the liquid are equal. 
E)  none of these

Question 17

Sodium oxide (Na2O) crystallizes in a structure in which the O2- ions are in a face-centered cubic lattice and the Na+ ions are in tetrahedral holes. What is the number of Na+ ions in the unit cell?

Accepted Answer

A)  8 
B)  2 
C)  4 
D)  6 
E)  none of these 
A)  8 
B)  2 
C)  4 
D)  6 
E)  none of these

Question 18

A liquid placed in a closed container will evaporate until equilibrium is reached. At equilibrium, which of the following statements is not true?

Accepted Answer

A)  Liquid molecules are still evaporating. 
B)  The number of vapor molecules remains essentially constant. 
C)  The partial pressure exerted by the vapor molecules is called the vapor pressure of the liquid. 
D)  The boundary (meniscus) between the liquid and the vapor disappears. 
E)  All of these statements are true. 
A)  Liquid molecules are still evaporating. 
B)  The number of vapor molecules remains essentially constant. 
C)  The partial pressure exerted by the vapor molecules is called the vapor pressure of the liquid. 
D)  The boundary (meniscus) between the liquid and the vapor disappears. 
E)  All of these statements are true.

Question 19

Chromium metal crystallizes as a body-centered cubic lattice. If the atomic radius of Cr is 1.25 angstroms, what is the density of Cr metal in grams per cubic centimeter?

Accepted Answer

A)  2.76 g/cm3 
B)  5.52 g/cm3 
C)  7.18 g/cm3 
D)  3.59 g/cm3 
E)  7.81 g/cm3 
A)  2.76 g/cm3 
B)  5.52 g/cm3 
C)  7.18 g/cm3 
D)  3.59 g/cm3 
E)  7.81 g/cm3

Question 20

The molar volume of a certain form of solid lead is 18 cmS1U1P13S1S1P0/mol. Assuming cubic closest-packed structure, determine the following.
-The radius of a Pb atom

Accepted Answer

A)  1740 pm 
B)  17.4 pm 
C)  174 pm 
D)  1.74 pm 
E)  none of these 
A)  1740 pm 
B)  17.4 pm 
C)  174 pm 
D)  1.74 pm 
E)  none of these

Based on intermolecular forces, which organic compound should have the highest boiling point?

Of the three cubic unit cells, which lattice packing leaves the least amount of free space in the cell?

Identify the major attractive force in Ne.

Which of the following is the correct order of boiling points for NaNO₃, C₂H₅OH, C₂H₆, and Ne?

When 1.00 mol of a pure liquid is vaporized at a constant pressure of 1.06 atm and at its boiling point of 313.4 K, 30.00 kJ of energy (heat) is absorbed and the volume change is +25.80 L. What is H for this process? (1 L-atm = 101.3 J)

Which of the following is most likely to be a gas at room temperature?

Which substance can be described as cations bonded together by mobile electrons?

Which substance involves no intermolecular forces except London dispersion forces?

In cubic closest-packed solids, what percentage of space is occupied by the spheres?

The resistance of a liquid to an increase in its surface area is called

Properties of liquids lie (closer to/further from) properties of a solid than to (or from) properties of a gas.

A certain substance has the phase diagram shown below. At which of the following values of T and P is the substance a pure liquid?

Which of the following processes must exist in equilibrium with the condensation process when a measurement of vapor pressure is made?

When 1.00 mol of a pure liquid is vaporized at a constant pressure of 1.00 atm and at its boiling point of 330.8 K, 31.86 kJ of energy (heat) is absorbed and the volume change is +25.32 L. What is E for this process? (1 L-atm = 101.3 J)

The triple point of a substance is

Sodium oxide (Na₂O) crystallizes in a structure in which the O²^- ions are in a face-centered cubic lattice and the Na⁺ ions are in tetrahedral holes. What is the number of Na⁺ ions in the unit cell?

A liquid placed in a closed container will evaporate until equilibrium is reached. At equilibrium, which of the following statements is not true?

Chromium metal crystallizes as a body-centered cubic lattice. If the atomic radius of Cr is 1.25 angstroms, what is the density of Cr metal in grams per cubic centimeter?

The molar volume of a certain form of solid lead is 18 cm³/mol. Assuming cubic closest-packed structure, determine the following. -The radius of a Pb atom

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Applications of Aqueous Equilibria

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Spontaneity, Entropy, and Free Energy

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Covalent Bonding: Orbitals

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Exam 16: Liquids and Solids

Based on intermolecular forces, which organic compound should have the highest boiling point?

Of the three cubic unit cells, which lattice packing leaves the least amount of free space in the cell?

Identify the major attractive force in Ne.

Which of the following is the correct order of boiling points for NaNO3, C2H5OH, C2H6, and Ne?

When 1.00 mol of a pure liquid is vaporized at a constant pressure of 1.06 atm and at its boiling point of 313.4 K, 30.00 kJ of energy (heat) is absorbed and the volume change is +25.80 L. What is H for this process? (1 L-atm = 101.3 J)

Which of the following is most likely to be a gas at room temperature?

Which substance can be described as cations bonded together by mobile electrons?

Which substance involves no intermolecular forces except London dispersion forces?

In cubic closest-packed solids, what percentage of space is occupied by the spheres?

The resistance of a liquid to an increase in its surface area is called

Properties of liquids lie (closer to/further from) properties of a solid than to (or from) properties of a gas.

A certain substance has the phase diagram shown below. At which of the following values of T and P is the substance a pure liquid?

Which of the following processes must exist in equilibrium with the condensation process when a measurement of vapor pressure is made?

When 1.00 mol of a pure liquid is vaporized at a constant pressure of 1.00 atm and at its boiling point of 330.8 K, 31.86 kJ of energy (heat) is absorbed and the volume change is +25.32 L. What is E for this process? (1 L-atm = 101.3 J)

The triple point of a substance is

Sodium oxide (Na2O) crystallizes in a structure in which the O2- ions are in a face-centered cubic lattice and the Na+ ions are in tetrahedral holes. What is the number of Na+ ions in the unit cell?

A liquid placed in a closed container will evaporate until equilibrium is reached. At equilibrium, which of the following statements is not true?

Chromium metal crystallizes as a body-centered cubic lattice. If the atomic radius of Cr is 1.25 angstroms, what is the density of Cr metal in grams per cubic centimeter?

The molar volume of a certain form of solid lead is 18 cm3/mol. Assuming cubic closest-packed structure, determine the following. -The radius of a Pb atom

Atoms, Molecules, and Ions

Stoichiometry

Chemical Reactions and Solutions Stoichiometry

Gases

Chemical Equilibrium

Acids and Bases

Applications of Aqueous Equilibria

Energy, Enthalpy, and Thermochemistry

Spontaneity, Entropy, and Free Energy

Electrochemistry

Quantum Mechanics and Atomic Theory

Bonding: General Concepts

Covalent Bonding: Orbitals

Chemical Kinetics

Properties of Solutions

The Representative Elements

Transition Metals and Coordination Chemistry

The Nucleus: a Chemists View

Organic and Biochemical Molecules

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Which of the following is the correct order of boiling points for NaNO₃, C₂H₅OH, C₂H₆, and Ne?

Sodium oxide (Na₂O) crystallizes in a structure in which the O²^- ions are in a face-centered cubic lattice and the Na⁺ ions are in tetrahedral holes. What is the number of Na⁺ ions in the unit cell?

The molar volume of a certain form of solid lead is 18 cm³/mol. Assuming cubic closest-packed structure, determine the following. -The radius of a Pb atom