Question 1

When sodium chloride dissolves in water, how do the water molecules orient around the ions?

Accepted Answer

A)   Water molecules are randomly oriented around the ions.
B)   The hydrogen atoms point toward both the sodium and the chloride.
C)   The oxygen atoms point toward both the sodium and the chloride.
D)   Around sodium the hydrogen atoms point toward the sodium, and around chloride the oxygen atoms point toward the chloride.
E)   Around sodium the oxygen atoms point toward the sodium, and around chloride the hydrogen atoms point toward the chloride.F) All of the above
G) A) and C)

Question 2

Which is the dominant interaction between water molecules?

Accepted Answer

A)   ion-ion
B)   ion-dipole
C)   dipole-dipole
D)   hydrogen bonding
E)   dispersion or London forcesF) A) and D)
G) B) and E)

Question 3

Which alkane compound has the highest boiling point?

Accepted Answer

A)   C4H10
B)   C5H12
C)   C6H14
D)   C7H16
E)   C8H18F) B) and D)
G) A) and B)

Question 4

Which of the following gases would you expect to have the largest van der Waals a constant value?

Accepted Answer

A)   Kr
B)   N2
C)   O2
D)   H2
E)   NeF) B) and D)
G) All of the above

Question 5

Of the two compounds shown below, one is slightly soluble in water and the other is insoluble in water. Identify the slightly soluble compound and explain why it is soluble in water.
I. ClCH2CH2Cl 2CH2Cl   II. CHCl2CH3    A)  I because it can form hydrogen bonds with water at each end of the molecule. B)  I because it has stronger dispersion interactions with water. C)  II because it has stronger dipole-dipole interactions with water. D)  II because it has stronger dispersion interactions with water. E)  I because it is nonpolar." class="answers-bank-image d-inline" rel="preload" >
II. CHCl2CH3  2CH2Cl   II. CHCl2CH3    A)  I because it can form hydrogen bonds with water at each end of the molecule. B)  I because it has stronger dispersion interactions with water. C)  II because it has stronger dipole-dipole interactions with water. D)  II because it has stronger dispersion interactions with water. E)  I because it is nonpolar." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   I because it can form hydrogen bonds with water at each end of the molecule.
B)   I because it has stronger dispersion interactions with water.
C)   II because it has stronger dipole-dipole interactions with water.
D)   II because it has stronger dispersion interactions with water.
E)   I because it is nonpolar.F) B) and C)
G) A) and B)

Question 6

Molecular nitrogen (N2)  interacts with water and is sparingly soluble in water due to ________

Accepted Answer

A)   dispersion forces.
B)   dipole-induced dipole forces.
C)   ion-dipole forces.
D)   hydrogen bonding.
E)   dipole-dipole forces.F) B) and E)
G) A) and C)

Question 7

Which of the following requires the smallest energy to separate the ions?

Accepted Answer

A)   CaF2
B)   KF
C)   NaF
D)   MgF2
E)   LiClF) A) and B)
G) None of the above

Question 8

Which is the dominant interaction between oxygen and nitrogen molecules in air?

Accepted Answer

A)   ion-ion
B)   ion-dipole
C)   dipole-dipole
D)   hydrogen bonding
E)   dispersion or London forcesF) D) and E)
G) B) and C)

Question 9

Identify the dominant intermolecular interaction(s) that must be overcome when solid CO2 sublimes and H2O melts.

Accepted Answer

Carbon dioxide is nonpolar, so...

Question 10

Which of the following statements correctly characterizes the rate of evaporation of a liquid?
I. Increases with increasing temperature because molecules have higher kinetic energies.
II. Increases with increasing surface area of the liquid because more molecules are located at the surface.
III. Decreases with stronger intermolecular forces because molecules are less able to escape from the surface of the liquid.

Accepted Answer

A)   I only
B)   II only
C)   III only
D)   I and II only
E)   All three: I, II, and IIIF) D) and E)
G) B) and E)

Question 11

Which statement about a hydrogen bond is not correct?

Accepted Answer

A)   Hydrogen bonds involve hydrogen bonded to carbon, nitrogen, oxygen, or fluorine.
B)   In a hydrogen bond, the hydrogen atom on one molecule is attracted to unpaired electrons associated with nitrogen, oxygen, or fluorine on another molecule.
C)   A hydrogen bond can be thought of as a very strong dipole-dipole interaction.
D)   The presence of hydrogen bonds leads to anomalously high boiling points for liquids.
E)   Hydrogen bonds stabilize the double helix structure of DNA.F) A) and C)
G) A) and D)

Question 12

The phase diagram for carbon dioxide is shown below. What is the phase that exists at room temperature (22oC)  and 100 atm pressure? oC)  and 100 atm pressure?   A)  gas B)  liquid C)  solid I D)  supercritical fluid E)  solid II" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   gas
B)   liquid
C)   solid I
D)   supercritical fluid
E)   solid IIF) B) and D)
G) B) and E)

Question 13

Which of the following compounds would you most appropriately call hydrophobic?

Accepted Answer

A)   CH4
B)   H2CO
C)   CO
D)   HCl
E)   NaClF) A) and B)
G) A) and C)

Question 14

Sketch a phase diagram for water and correctly label all the parts (areas, lines, points, key temperatures).

Accepted Answer

Boiling points can also be cal...

Question 15

Which of the following statements does not correctly characterize the rate of evaporation of a liquid?
I. Increases with increasing temperature because molecules have higher kinetic energies.
II. Increases with increasing surface area of the liquid because more molecules are located at the surface.
III. Increases with stronger intermolecular forces because molecules in the liquid repel each other more.

Accepted Answer

A)   I only
B)   II only
C)   III only
D)   I and II only
E)   II and III onlyF) All of the above
G) B) and D)

Question 16

Define the term vapor pressure.

Accepted Answer

Vapor pressure is the pressure...

Question 17

When two liquids mix completely in all proportions, they are ________

Accepted Answer

A)   soluble.
B)   miscible.
C)   insoluble.
D)   solvated.
E)   ubiquitous.F) All of the above
G) None of the above

Question 18

Which liquid, water or ethanol, would you expect to have the higher surface tension and viscosity? Explain.

Accepted Answer

Water would have higher surface tension ...

Question 19

Which of the following compounds will have the strongest dipole-dipole interactions between its molecules?

Accepted Answer

A)   CF4
B)   CH4
C)   CH3F
D)   CH2F2
E)   CH3ClF) D) and E)
G) None of the above

Question 20

Which statement about vapor pressure of a pure liquid is not correct?

Accepted Answer

A)   The vapor pressure is the pressure of the gas at a given temperature in equilibrium with its liquid phase.
B)   The temperature at which the vapor pressure equals 760 torr is called the normal boiling point of the substance.
C)   The vapor pressure increases with increasing temperature.
D)   The vapor pressure increases with increasing surface area of the liquid.
E)   Substances with weak intermolecular forces have high vapor pressures at a given temperature.F) D) and E)
G) A) and E)

Exam 10: Intermolecular Forces: The Uniqueness of Water

Which of the following gases would you expect to have the largest van der Waals a constant value?

Correct Answer
verified

Which is the dominant interaction between water molecules?

Correct Answer
verified

Which of the following requires the smallest energy to separate the ions?

Correct Answer
verified

Identify the dominant intermolecular interaction(s) that must be overcome when solid CO₂ sublimes and H₂O melts.

Correct Answer
verified
Carbon dioxide is nonpolar, so...
View Answer

Which alkane compound has the highest boiling point?

Correct Answer
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Correct Answer
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Correct Answer
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Which is the dominant interaction between oxygen and nitrogen molecules in air?

Correct Answer
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When sodium chloride dissolves in water, how do the water molecules orient around the ions?

Correct Answer
verified

When two liquids mix completely in all proportions, they are ________

Correct Answer
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Which liquid, water or ethanol, would you expect to have the higher surface tension and viscosity? Explain.

Correct Answer
verified
Water would have higher surface tension ...
View Answer

Define the term vapor pressure.

Correct Answer
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Vapor pressure is the pressure...
View Answer

Of the two compounds shown below, one is slightly soluble in water and the other is insoluble in water. Identify the slightly soluble compound and explain why it is soluble in water. I. ClCH₂CH₂Cl II. CHCl₂CH₃

Correct Answer
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Which statement about a hydrogen bond is not correct?

Correct Answer
verified

Molecular nitrogen (N₂) interacts with water and is sparingly soluble in water due to ________

Correct Answer
verified

Which statement about vapor pressure of a pure liquid is not correct?

Correct Answer
verified

Sketch a phase diagram for water and correctly label all the parts (areas, lines, points, key temperatures).

Correct Answer
verified
Boiling points can also be cal...
View Answer

The phase diagram for carbon dioxide is shown below. What is the phase that exists at room temperature (22^oC) and 100 atm pressure?

Correct Answer
verified

Which of the following compounds will have the strongest dipole-dipole interactions between its molecules?

Correct Answer
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Which of the following compounds would you most appropriately call hydrophobic?

Correct Answer
verified

Exam 10: Intermolecular Forces: The Uniqueness of Water

Which of the following gases would you expect to have the largest van der Waals a constant value?

Correct AnswerverifiedShow Answer

Which is the dominant interaction between water molecules?

Correct AnswerverifiedShow Answer

Which of the following requires the smallest energy to separate the ions?

Correct AnswerverifiedShow Answer

Identify the dominant intermolecular interaction(s) that must be overcome when solid CO2 sublimes and H2O melts.

Correct AnswerverifiedCarbon dioxide is nonpolar, so...View AnswerShow Answer

Which alkane compound has the highest boiling point?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which is the dominant interaction between oxygen and nitrogen molecules in air?

Correct AnswerverifiedShow Answer

When sodium chloride dissolves in water, how do the water molecules orient around the ions?

Correct AnswerverifiedShow Answer

When two liquids mix completely in all proportions, they are ________

Correct AnswerverifiedShow Answer

Which liquid, water or ethanol, would you expect to have the higher surface tension and viscosity? Explain.

Correct AnswerverifiedWater would have higher surface tension ...View AnswerShow Answer

Define the term vapor pressure.

Correct AnswerverifiedVapor pressure is the pressure...View AnswerShow Answer

Of the two compounds shown below, one is slightly soluble in water and the other is insoluble in water. Identify the slightly soluble compound and explain why it is soluble in water. I. ClCH2CH2Cl II. CHCl2CH3

Correct AnswerverifiedShow Answer

Which statement about a hydrogen bond is not correct?

Correct AnswerverifiedShow Answer

Molecular nitrogen (N2) interacts with water and is sparingly soluble in water due to ________

Correct AnswerverifiedShow Answer

Which statement about vapor pressure of a pure liquid is not correct?

Correct AnswerverifiedShow Answer

Sketch a phase diagram for water and correctly label all the parts (areas, lines, points, key temperatures).

Correct AnswerverifiedBoiling points can also be cal...View AnswerShow Answer

The phase diagram for carbon dioxide is shown below. What is the phase that exists at room temperature (22oC) and 100 atm pressure?

Correct AnswerverifiedShow Answer

Which of the following compounds will have the strongest dipole-dipole interactions between its molecules?

Correct AnswerverifiedShow Answer

Which of the following compounds would you most appropriately call hydrophobic?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
verified

Correct Answer
verified

Identify the dominant intermolecular interaction(s) that must be overcome when solid CO₂ sublimes and H₂O melts.

Correct Answer
verified
Carbon dioxide is nonpolar, so...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
verified
Water would have higher surface tension ...
View Answer

Correct Answer
verified
Vapor pressure is the pressure...
View Answer

Of the two compounds shown below, one is slightly soluble in water and the other is insoluble in water. Identify the slightly soluble compound and explain why it is soluble in water. I. ClCH₂CH₂Cl II. CHCl₂CH₃

Correct Answer
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Correct Answer
verified

Molecular nitrogen (N₂) interacts with water and is sparingly soluble in water due to ________

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Boiling points can also be cal...
View Answer

The phase diagram for carbon dioxide is shown below. What is the phase that exists at room temperature (22^oC) and 100 atm pressure?

Correct Answer
verified

Correct Answer
verified

Correct Answer
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