Question 1

Which of the following atoms should have the greatest polarizability?

Accepted Answer

A)  F 
B)  Br 
C)  Po 
D)  Pb 
E)  He 
A)  F 
B)  Br 
C)  Po 
D)  Pb 
E)  He

Question 2

Which of the following is true about kinetic energy, Ek, and potential energy, Ep, when ethyl alcohol at 40°C is compared with ethyl alcohol at 20°C?

Accepted Answer

A)  Ek(40°
C)  k(20°
C) ; Ep(40°
C)  ≈ Ep(20°
C)  
B)  Ek(40°
C)  > Ek(20°
C) ; Ep(40°
C)  ≈ Ep(20°
C)  
C)  Ep(40°
C)  p(20°
C) ; Ek(40°
C)  ≈ Ek(20°
C)  
D)  Ep(40°
C)  > Ep(20°
C) ; Ek(40°
C)  ≈ Ek(20°
C)  
E)  Ep(40°
C)  > Ep(20°
C) ; Ek(40°
C)  > Ek(20°
C)  
A)  Ek(40°
C)  k(20°
C) ; Ep(40°
C)  ≈ Ep(20°
C)  
B)  Ek(40°
C)  > Ek(20°
C) ; Ep(40°
C)  ≈ Ep(20°
C)  
C)  Ep(40°
C)  p(20°
C) ; Ek(40°
C)  ≈ Ek(20°
C)  
D)  Ep(40°
C)  > Ep(20°
C) ; Ek(40°
C)  ≈ Ek(20°
C)  
E)  Ep(40°
C)  > Ep(20°
C) ; Ek(40°
C)  > Ek(20°
C)

Question 3

Diethyl ether, used as a solvent for extraction of organic compounds from aqueous solutions, has a high vapor pressure which makes it a potential fire hazard in laboratories in which it is used. How much energy is released when 100.0 g is cooled from 53.0°C to 10.0°C? Boiling point: 34.5°C
Heat of vaporization: 351 J/g
Specific heat capacity, (CH3)2O(l): 3.74 J/(g·K)
Specific heat capacity, (CH3)2O(g): 2.35 J/(g·K)

Accepted Answer

A)  10.1 kJ 
B)  13.1 kJ 
C)  16.1 kJ 
D)  45.2 kJ 
E)  48.6 kJ 
A)  10.1 kJ 
B)  13.1 kJ 
C)  16.1 kJ 
D)  45.2 kJ 
E)  48.6 kJ

Question 4

Which of the following should have the highest surface tension at a given temperature?

Accepted Answer

A)  CH4 
B)  CF4 
C)  CCl4 
D)  CBr4 
E)  CI4 
A)  CH4 
B)  CF4 
C)  CCl4 
D)  CBr4 
E)  CI4

Question 5

Polonium crystallizes in the simple cubic lattice. What is the coordination number for Po?

Accepted Answer

A)  3 
B)  4 
C)  6 
D)  8 
E)  12 
A)  3 
B)  4 
C)  6 
D)  8 
E)  12

Question 6

A sample of octane in equilibrium with its vapor in a closed 1.0-L container has a vapor pressure of 50.0 torr at 45°C. The container's volume is increased to 2.0 L at constant temperature and the liquid/vapor equilibrium is reestablished. What is the vapor pressure?

Accepted Answer

A)  > 50.0 torr 
B)  50.0 torr 
C)  25.0 torr 
D)  The mass of the octane vapor is needed to calculate the vapor pressure. 
E)  The external pressure is needed to calculate the vapor pressure. 
A)  > 50.0 torr 
B)  50.0 torr 
C)  25.0 torr 
D)  The mass of the octane vapor is needed to calculate the vapor pressure. 
E)  The external pressure is needed to calculate the vapor pressure.

Question 7

A 5.00 g sample of water vapor, initially at 155°C is cooled at atmospheric pressure, producing ice at -55°C. Calculate the amount of heat energy lost by the water sample in this process, in kJ. Use the following data: specific heat capacity of ice is 2.09 J/g·K; specific heat capacity of liquid water is 4.18 J/g·K; specific heat capacity of water vapor is 1.84 J/g·K; heat of fusion of ice is 336 J/g; heat of vaporization of water is 2260 J/g.

Accepted Answer

A)  15.6 kJ 
B)  10.2 kJ 
C)  5.4 kJ 
D)  3.2 kJ 
E)  1.6 kJ 
A)  15.6 kJ 
B)  10.2 kJ 
C)  5.4 kJ 
D)  3.2 kJ 
E)  1.6 kJ

Question 8

Octane is a component of fuel used in internal combustion engines. The dominant intermolecular forces in octane are

Accepted Answer

A)  dipole-dipole forces. 
B)  London dispersion forces. 
C)  hydrogen bonding. 
D)  covalent bonds. 
E)  carbon-hydrogen bonds. 
A)  dipole-dipole forces. 
B)  London dispersion forces. 
C)  hydrogen bonding. 
D)  covalent bonds. 
E)  carbon-hydrogen bonds.

Question 9

Which of the following should have the highest boiling point?

Accepted Answer

A)  CF4 
B)  CCl4 
C)  CBr4 
D)  CI4 
E)  CH4 
A)  CF4 
B)  CCl4 
C)  CBr4 
D)  CI4 
E)  CH4

Question 10

Which of the following statements about the packing of monatomic solids with different unit cells is incorrect?

Accepted Answer

A)  The coordination number of atoms in hcp and fcc structures is 12. 
B)  The coordination number of atoms in simple cubic structures is 6. 
C)  The coordination number of atoms in bcc structures is 8. 
D)  A bcc structure has a higher packing efficiency than a simple cubic structure. 
E)  A bcc structure has a higher packing efficiency than a fcc structure. 
A)  The coordination number of atoms in hcp and fcc structures is 12. 
B)  The coordination number of atoms in simple cubic structures is 6. 
C)  The coordination number of atoms in bcc structures is 8. 
D)  A bcc structure has a higher packing efficiency than a simple cubic structure. 
E)  A bcc structure has a higher packing efficiency than a fcc structure.

Question 11

Liquid ammonia (boiling point = -33.4°C) can be used as a refrigerant and heat transfer fluid. How much energy is needed to heat 25.0 g of NH3(l) from -65.0°C to -12.0°C?
Specific heat capacity, NH3(l): 4.7 J/(g·K)
Specific heat capacity, NH3(g): 2.2 J/(g·K)
Heat of vaporization: 23.5 kJ/mol
Molar mass,   : 17.0 g/mol

Accepted Answer

A)  5.5 kJ 
B)  6.3 kJ 
C)  39 kJ 
D)  340 kJ 
E)  590 kJ 
A)  5.5 kJ 
B)  6.3 kJ 
C)  39 kJ 
D)  340 kJ 
E)  590 kJ

Question 12

All gases can be liquefied at room temperature simply by increasing the pressure on the gas.

Accepted Answer

A) True 
 B)False

Question 13

Which of the following pairs of molecules can form hydrogen bonds between them?

Accepted Answer

A)  HCl and HI 
B)  CH3OH and NH3 
C)  CH4 and H2O 
D)  SO2 and CH2O 
E)  H2 and O2 
A)  HCl and HI 
B)  CH3OH and NH3 
C)  CH4 and H2O 
D)  SO2 and CH2O 
E)  H2 and O2

Question 14

When identical particles pack in a simple cubic lattice, there is/are ____ particle(s) per unit cell.

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  8 
A)  1 
B)  2 
C)  3 
D)  4 
E)  8

Question 15

Acetic acid has a heat of fusion of 10.8 kJ/mol and a heat of vaporization of 24.3 kJ/mol. Estimate the value for the heat of sublimation.

Accepted Answer

A)  35.1 kJ/mol 
B)  13.5 kJ/mol 
C)  -13.5 kJ/mol 
D)  -35.1 kJ/mol 
E)  None of these choices are correct 
A)  35.1 kJ/mol 
B)  13.5 kJ/mol 
C)  -13.5 kJ/mol 
D)  -35.1 kJ/mol 
E)  None of these choices are correct

Question 16

Which of the following liquid substances would you expect to have the lowest surface tension?

Accepted Answer

A)  Pb 
B)  CH3OCH3 
C)  HOCH2CH2OH 
D)  H2O 
E)  CH3CH2OH 
A)  Pb 
B)  CH3OCH3 
C)  HOCH2CH2OH 
D)  H2O 
E)  CH3CH2OH

Question 17

A single water molecule can participate in at most two hydrogen bonds at any instant.

Accepted Answer

A) True 
 B)False

Question 18

In metals, the conduction bands and valence bands of the molecular orbitals are separated by a large energy gap.

Accepted Answer

A) True 
 B)False

Question 19

The phase diagram for xenon has a solid-liquid curve with a positive slope. Which of the following is true?

Accepted Answer

A)  Solid xenon has a higher density than liquid xenon. 
B)  Solid xenon has the same density as liquid xenon. 
C)  The phase diagram cannot be used to predict which phase of xenon is denser. 
D)  Freezing xenon is an endothermic process. 
E)  None of these choices are correct. 
A)  Solid xenon has a higher density than liquid xenon. 
B)  Solid xenon has the same density as liquid xenon. 
C)  The phase diagram cannot be used to predict which phase of xenon is denser. 
D)  Freezing xenon is an endothermic process. 
E)  None of these choices are correct.

Question 20

The phase diagram of a substance shows the energy changes associated with changes of state.

Accepted Answer

A) True 
 B)False

Exam 12: Intermolecular Forces Liquids, Solids, and Phase Changes

Which of the following atoms should have the greatest polarizability?

Which of the following is true about kinetic energy, Ek, and potential energy, Ep, when ethyl alcohol at 40°C is compared with ethyl alcohol at 20°C?

Which of the following should have the highest surface tension at a given temperature?

Polonium crystallizes in the simple cubic lattice. What is the coordination number for Po?

A sample of octane in equilibrium with its vapor in a closed 1.0-L container has a vapor pressure of 50.0 torr at 45°C. The container's volume is increased to 2.0 L at constant temperature and the liquid/vapor equilibrium is reestablished. What is the vapor pressure?

Octane is a component of fuel used in internal combustion engines. The dominant intermolecular forces in octane are

Which of the following should have the highest boiling point?

Which of the following statements about the packing of monatomic solids with different unit cells is incorrect?

All gases can be liquefied at room temperature simply by increasing the pressure on the gas.

Which of the following pairs of molecules can form hydrogen bonds between them?

When identical particles pack in a simple cubic lattice, there is/are ____ particle(s) per unit cell.

Acetic acid has a heat of fusion of 10.8 kJ/mol and a heat of vaporization of 24.3 kJ/mol. Estimate the value for the heat of sublimation.

Which of the following liquid substances would you expect to have the lowest surface tension?

A single water molecule can participate in at most two hydrogen bonds at any instant.

In metals, the conduction bands and valence bands of the molecular orbitals are separated by a large energy gap.

The phase diagram for xenon has a solid-liquid curve with a positive slope. Which of the following is true?

The phase diagram of a substance shows the energy changes associated with changes of state.

Keys to Studying Chemistry Definitions, Units, and Problem Solving

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

The Properties of Mixtures Solutions and Colloids

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Kinetics Rates and Mechanisms of Chemical Reactions

Equilibrium the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics Entropy, Free Energy, and Reaction Direction

Electrochemistry Chemical Change and Electrical Work

The Elements in Nature and Industry

Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Which of the following is true about kinetic energy, E_k, and potential energy, E_p, when ethyl alcohol at 40°C is compared with ethyl alcohol at 20°C?