Question 1

The interaction energy of LiF is -1.14 *10-18 J. What is the distance between the Li+ and F- ions?

Accepted Answer

A)  203 nm 
B)  203 pm 
C)  0.203 pm 
D)  494 pm 
E)  302 pm 
A)  203 nm 
B)  203 pm 
C)  0.203 pm 
D)  494 pm 
E)  302 pm

Question 2

Which of the following compounds is capable of hydrogen bonding?

Accepted Answer

A)  CH3OCH3 
B)  CH3COCH3 
C)  CH3CH2OH 
D)  H2CO 
E)  CH3F 
A)  CH3OCH3 
B)  CH3COCH3 
C)  CH3CH2OH 
D)  H2CO 
E)  CH3F

Question 3

Viscosity is a measure of a substance's ________

Accepted Answer

A)  ability to resist changes in its surface area. 
B)  surface tension. 
C)  resistance to flow. 
D)  compressibility. 
E)  color. 
A)  ability to resist changes in its surface area. 
B)  surface tension. 
C)  resistance to flow. 
D)  compressibility. 
E)  color.

Question 4

Why do gases behave nonideally at high pressures and low temperatures?

Accepted Answer

The ideal gas model neglects intermolecu

Question 5

In which of the following diagrams are the cohesive interactions between molecules in the liquid greater than the adhesive forces between the liquid and the walls of the tube?

Accepted Answer

A)  a 
B)  b 
C)  c 
D)  d 
A)  a 
B)  b 
C)  c 
D)  d

Question 6

Given the van der Waals a constant values for the following gases, which gas has the lowest boiling point?

Accepted Answer

A)  N2 a = 1.35 L2 · atm/mol2 
B)  O2 a = 1.36 L2 · atm/mol2 
C)  NH3 a = 4.25 L2 · atm/mol2 
D)  CH4 a = 2.27 L2 · atm/mol2 
E)  SO2 a = 6.71 L2 · atm/mol2 
A)  N2 a = 1.35 L2 · atm/mol2 
B)  O2 a = 1.36 L2 · atm/mol2 
C)  NH3 a = 4.25 L2 · atm/mol2 
D)  CH4 a = 2.27 L2 · atm/mol2 
E)  SO2 a = 6.71 L2 · atm/mol2

Question 7

Which of the following compounds is capable of dipole-dipole interactions?

Accepted Answer

A)  CH4 
B)  CO2 
C)  H2CO 
D)  SF6 
E)  NH4+ 
A)  CH4 
B)  CO2 
C)  H2CO 
D)  SF6 
E)  NH4+

Question 8

Condensation occurs in going from region ________

Accepted Answer

A)  I to II. 
B)  I to III. 
C)  II to III. 
D)  III to II. 
E)  III to I. 
A)  I to II. 
B)  I to III. 
C)  II to III. 
D)  III to II. 
E)  III to I.

Question 9

The vapor pressure of a liquid increases with increasing temperature because ________

Accepted Answer

A)  more molecules can escape from the liquid because their average kinetic energy is greater. 
B)  the number of gas molecules above the liquid does not change but their average kinetic energy increases. 
C)  the molecules in the liquid move faster and exert a greater pressure. 
D)  the ideal gas law states that the pressure is proportional to the temperature. 
E)  molecules interact less strongly at higher temperatures. 
A)  more molecules can escape from the liquid because their average kinetic energy is greater. 
B)  the number of gas molecules above the liquid does not change but their average kinetic energy increases. 
C)  the molecules in the liquid move faster and exert a greater pressure. 
D)  the ideal gas law states that the pressure is proportional to the temperature. 
E)  molecules interact less strongly at higher temperatures.

Question 10

Which alcohol should be most soluble in a nonpolar solvent such as hexane, C6H14?

Accepted Answer

A)  CH3OH 
B)  CH3CH2OH 
C)  CH3CH2CH2OH 
D)  CH3CH2CH2CH2OH 
E)  CH3CH2CH2CH2CH2OH 
A)  CH3OH 
B)  CH3CH2OH 
C)  CH3CH2CH2OH 
D)  CH3CH2CH2CH2OH 
E)  CH3CH2CH2CH2CH2OH

Question 11

Which of the following will require the greatest energy input to separate the ions?

Accepted Answer

A)  MgI2 
B)  MgF2 
C)  MgCl2 
D)  MgBr2 
E)  NaCl 
A)  MgI2 
B)  MgF2 
C)  MgCl2 
D)  MgBr2 
E)  NaCl

Question 12

Which of the following representations best shows the formation of an instantaneous dipole moment between two nonpolar molecules?

Accepted Answer

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

Question 13

The phase diagram for carbon dioxide is shown below. What are the phase changes in order as the pressure is increased starting at 0.5 atm, and the temperature is kept at -80oC?

Accepted Answer

A)  solid $\longrightarrow$
Gas 
B)  solid $\longrightarrow$
Liquid $\longrightarrow$
Gas 
C)  liquid $\longrightarrow$
Gas 
D)  gas $\longrightarrow$
Solid 
E)  gas $\longrightarrow$
Liquid 
A)  solid $\longrightarrow$
Gas 
B)  solid $\longrightarrow$
Liquid $\longrightarrow$
Gas 
C)  liquid $\longrightarrow$
Gas 
D)  gas $\longrightarrow$
Solid 
E)  gas $\longrightarrow$
Liquid

Question 14

Which of the following compounds would you expect to be a solid at room temperature and atmospheric pressure?

Accepted Answer

A)  C2H4 (an alkene) 
B)  HCl (an acid) 
C)  CH3CH2CH2CH3 (an alkane) 
D)  C10H8 (an aromatic hydrocarbon) 
E)  C6H6 (an aromatic hydrocarbon) 
A)  C2H4 (an alkene) 
B)  HCl (an acid) 
C)  CH3CH2CH2CH3 (an alkane) 
D)  C10H8 (an aromatic hydrocarbon) 
E)  C6H6 (an aromatic hydrocarbon)

Question 15

Rank the following compounds in order of increasing attraction between their ions: KBr, SrBr2, and CsBr.

Accepted Answer

A)  CsBr 2 
B)  SrBr2 2 2 2 < KBr < CsBr 
A)  CsBr 2 
B)  SrBr2 2 2 2 < KBr < CsBr

Question 16

The relative energies (strengths) of the intermolecular forces present in each of four different pure substances are shown in the figure below. Which substance is most likely to be a solid at room temperature?

Accepted Answer

A)  a 
B)  b 
C)  c 
D)  d 
A)  a 
B)  b 
C)  c 
D)  d

Question 17

Normal boiling points of branched alkane hydrocarbons generally are lower than for straight-chain hydrocarbons of the same molar mass because the straight-chain hydrocarbons ________

Accepted Answer

A)  have stronger dipole-dipole interactions. 
B)  have many more electrons. 
C)  have more C-H bonds. 
D)  have a larger surface area and come in closer contact with each other. 
E)  react with each other to form long chains. 
A)  have stronger dipole-dipole interactions. 
B)  have many more electrons. 
C)  have more C-H bonds. 
D)  have a larger surface area and come in closer contact with each other. 
E)  react with each other to form long chains.

Question 18

The relative energies (strengths) of the intermolecular forces present in each of four different pure substances are shown in the figure below. Which substance has the lowest melting point?

Accepted Answer

A)  a 
B)  b 
C)  c 
D)  d 
A)  a 
B)  b 
C)  c 
D)  d

Question 19

Based on their boiling points, which of the following compounds has the largest dipole-dipole interaction?

Accepted Answer

A)  propane (231 K) 
B)  dimethyl ether (248 K) 
C)  acetonitrile (355 K) 
D)  methyl chloride (249 K) 
E)  butane (135 K) 
A)  propane (231 K) 
B)  dimethyl ether (248 K) 
C)  acetonitrile (355 K) 
D)  methyl chloride (249 K) 
E)  butane (135 K)

Question 20

The temperature at point b in the phase diagram below is the ________

Accepted Answer

A)  critical point. 
B)  triple point. 
C)  transition point. 
D)  normal freezing point. 
E)  normal boiling point. 
A)  critical point. 
B)  triple point. 
C)  transition point. 
D)  normal freezing point. 
E)  normal boiling point.

Exam 10: Intermolecular Forces: The Uniqueness of Water

The interaction energy of LiF is -1.14 *10-18 J. What is the distance between the Li+ and F- ions?

Which of the following compounds is capable of hydrogen bonding?

Viscosity is a measure of a substance's ________

Why do gases behave nonideally at high pressures and low temperatures?

In which of the following diagrams are the cohesive interactions between molecules in the liquid greater than the adhesive forces between the liquid and the walls of the tube?

Given the van der Waals a constant values for the following gases, which gas has the lowest boiling point?

Which of the following compounds is capable of dipole-dipole interactions?

Condensation occurs in going from region ________

The vapor pressure of a liquid increases with increasing temperature because ________

Which alcohol should be most soluble in a nonpolar solvent such as hexane, C6H14?

Which of the following will require the greatest energy input to separate the ions?

Which of the following representations best shows the formation of an instantaneous dipole moment between two nonpolar molecules?

The phase diagram for carbon dioxide is shown below. What are the phase changes in order as the pressure is increased starting at 0.5 atm, and the temperature is kept at -80oC?

Which of the following compounds would you expect to be a solid at room temperature and atmospheric pressure?

Rank the following compounds in order of increasing attraction between their ions: KBr, SrBr2, and CsBr.

The relative energies (strengths) of the intermolecular forces present in each of four different pure substances are shown in the figure below. Which substance is most likely to be a solid at room temperature?

Normal boiling points of branched alkane hydrocarbons generally are lower than for straight-chain hydrocarbons of the same molar mass because the straight-chain hydrocarbons ________

The relative energies (strengths) of the intermolecular forces present in each of four different pure substances are shown in the figure below. Which substance has the lowest melting point?

Based on their boiling points, which of the following compounds has the largest dipole-dipole interaction?

The temperature at point b in the phase diagram below is the ________

Matter and Energy: The Origin of the Universe

Atoms, Ions, and Molecules: Matter Starts Here

Stoichiometry: Mass, Formulas, and Reactions

Solution Chemistry: The Hydrosphere

Thermochemistry: Energy Changes in Reactions

Properties of Gases: the Air We Breathe

A Quantum Model of Atoms: Waves and Particles

Chemical Bonds: What Makes a Gas a Greenhouse Gas

Molecular Geometry: Shape Determines Function

Solutions: Properties and Behavior

Solids: Structures and Applications

Organic Chemistry: Fuels, Pharmaceuticals, Materials, and Life

Chemical Kinetics: Reactions in the Air We Breathe

Chemical Equilibrium: How Much Product Does a Reaction Really Make

Acid-Base and Solubility Equilibria: Reactions in Soil and Water

Metal Ions: Colorful and Essential

Thermodynamics: Spontaneous and Nonspontaneous Reactions and Processes

Electrochemistry: the Quest for Clean Energy

Biochemistry: the Compounds of Life

Nuclear Chemistry: Applications to Energy and Medicine

Life and the Periodic Table

Filters

The interaction energy of LiF is -1.14 *10^-¹⁸ J. What is the distance between the Li⁺ and F^- ions?

Which alcohol should be most soluble in a nonpolar solvent such as hexane, C₆H₁₄?

The phase diagram for carbon dioxide is shown below. What are the phase changes in order as the pressure is increased starting at 0.5 atm, and the temperature is kept at -80^oC?

Rank the following compounds in order of increasing attraction between their ions: KBr, SrBr₂, and CsBr.