Question 1

The intermolecular force(s) responsible for the fact that CH4 has the lowest boiling point in the set CH4, SiH4, GeH4, SnH4 is/are ________.

Accepted Answer

A)  hydrogen bonding
B)  dipole-dipole interactions
C)  London dispersion forces
D)  mainly hydrogen bonding but also dipole-dipole interactions
E)  mainly London-dispersion forces but also dipole-dipole interactionsF) C) and D)
G) B) and C)

Question 2

-The phase diagram of a substance is given above. The region that corresponds to the solid phase is ________.

Accepted Answer

A)  w
B)  x
C)  y
D)  z
E)  x and yF) A) and D)
G) D) and E)

Question 3

What type(s) of intermolecular forces exist between Br2 and CCl4?

Accepted Answer

A)  dispersion forces
B)  dispersion forces and ion-dipole
C)  dispersion forces and dipole-dipole
D)  dispersion forces, ion-dipole, and dipole-dipole
E)  None. Since both are gases at room temperature, they do not interact with each other.F) A) and B)
G) A) and C)

Question 4

-The phase changes B → C and D → E are not associated with temperature increases because the heat energy is used up to ________.

Accepted Answer

A)  increase distances between molecules
B)  break intramolecular bonds
C)  rearrange atoms within molecules
D)  increase the velocity of molecules
E)  increase the density of the sampleF) D) and E)
G) B) and D)

Question 5

What intermolecular force is responsible for the fact that ice is less dense than liquid water?

Accepted Answer

A)  London dispersion forces
B)  dipole-dipole forces
C)  ion-dipole forces
D)  hydrogen bonding
E)  ionic bondingF) None of the above
G) A) and C)

Question 6

In which of the following molecules is hydrogen bonding likely to be the most significant component of the total intermolecular forces?

Accepted Answer

A)  CH4
B)  C5H11OH
C)  C6H13NH2
D)  CH3OH
E)  CO2F) A) and C)
G) None of the above

Question 7

Boron triiodide (BI3) melts at 49.9 °C and boils at 209.5 °C at a constant pressure of 1 atm. What state of matter must a sample of boron triiodide be in at 100°C and 1 atm?

Accepted Answer

A)  liquid
B)  gas
C)  solid
D)  solid and liquid in equilibrium
E)  liquid and gas in equilibriumF) C) and E)
G) A) and E)

Question 8

Of the following substances, ________ has the highest boiling point.

Accepted Answer

A)  Br2
B)  N2
C)  Cl2
D)  O2
E)  H2F) A) and C)
G) A) and D)

Question 9

For a given substance that exhibits liquid-crystalline properties, the transition from solid to liquid-crystal state occurs ________.

Accepted Answer

A)  over a range of temperatures between the melting point of the solid and the boiling point of the liquid
B)  at the melting point of the solid
C)  over a range of temperatures that includes the melting point of the solid
D)  at a well-defined temperature above the melting point of the solid
E)  at a well-defined temperature below the melting point of the solidF) C) and D)
G) C) and E)

Question 10

Which of the following molecules has hydrogen bonding as its only intermolecular force?

Accepted Answer

A)  HF
B)  H2O
C)  C6H13NH2
D)  C5H11OH
E)  None, all of the above exhibit dispersion forces.F) None of the above
G) A) and E)

Question 11

As a gaseous element condenses, the atoms become ________ and they have ________ attraction for one another.

Accepted Answer

A)  more separated, more
B)  more separated, less
C)  closer together, more
D)  closer together, less
E)  larger, greaterF) A) and B)
G) A) and C)

Question 12

How high a liquid will rise up a narrow tube as a result of capillary action depends on ________.

Accepted Answer

A)  the magnitudes of cohesive forces in the liquid and adhesive forces between the liquid and the tube, and gravity
B)  gravity alone
C)  only the magnitude of adhesive forces between the liquid and the tube
D)  the viscosity of the liquid
E)  only the magnitude of cohesive forces in the liquidF) C) and D)
G) None of the above

Question 13

-The normal boiling point of the substance with the phase diagram shown above is ________ °C.

Accepted Answer

A)  10
B)  20
C)  30
D)  40
E)  50F) B) and E)
G) C) and E)

Question 14

Which of the following characteristics would prevent liquid crystal behavior?

Accepted Answer

A)  long axial structure
B)  ionic configuration
C)  carbon-carbon single bonds
D)  double bonding
E)  polar groupsF) B) and C)
G) All of the above

Question 15

In liquids, the attractive intermolecular forces are ________.

Accepted Answer

A)  very weak compared with kinetic energies of the molecules
B)  strong enough to hold molecules relatively close together
C)  strong enough to keep the molecules confined to vibrating about their fixed lattice points
D)  not strong enough to keep molecules from moving past each other
E)  strong enough to hold molecules relatively close together but not strong enough to keep molecules from moving past each otherF) A) and B)
G) A) and C)

Question 16

What types of intermolecular forces exist between NH3 and HF?

Accepted Answer

A)  dispersion forces and dipole-dipole forces
B)  dispersion forces and hydrogen bonds
C)  dispersion forces, dipole-dipole forces, and hydrogen bonds
D)  dispersion forces
E)  dispersion forces, hydrogen bonds, and ion-dipole forcesF) A) and E)
G) C) and D)

Question 17

What is the predominant intermolecular force in H2NNH2?

Accepted Answer

A)  hydrogen bonding
B)  ion-dipole attraction
C)  ionic bonding
D)  dipole-dipole attraction
E)  London-dispersion forcesF) All of the above
G) A) and B)

Question 18

Of the following, ________ is the least volatile.

Accepted Answer

A)  CI4
B)  CF4
C)  CBr4
D)  CCl4
E)  CH4F) B) and E)
G) B) and C)

Question 19

-On the phase diagram shown above, the coordinates of point ________ correspond to the critical temperature and pressure.

Accepted Answer

A)  A
B)  B
C)  C
D)  D
E)  EF) B) and D)
G) C) and E)

Question 20

A ________ liquid crystal has the least order and is the most liquid-like.

Accepted Answer

A)  nematic
B)  smectic
C)  cholesteric
D)  smectic B
E)  smectic CF) B) and E)
G) B) and C)

Exam 11: Liquids and Intermolecular Forces

What type(s) of intermolecular forces exist between Br2 and CCl4?

Correct AnswerverifiedShow Answer

Of the following substances, ________ has the highest boiling point.

Correct AnswerverifiedShow Answer

Boron triiodide (BI3) melts at 49.9 °C and boils at 209.5 °C at a constant pressure of 1 atm. What state of matter must a sample of boron triiodide be in at 100°C and 1 atm?

Correct AnswerverifiedShow Answer

A ________ liquid crystal has the least order and is the most liquid-like.

Correct AnswerverifiedShow Answer

-The phase diagram of a substance is given above. The region that corresponds to the solid phase is ________.

Correct AnswerverifiedShow Answer

As a gaseous element condenses, the atoms become ________ and they have ________ attraction for one another.

Correct AnswerverifiedShow Answer

Which of the following characteristics would prevent liquid crystal behavior?

Correct AnswerverifiedShow Answer

-The normal boiling point of the substance with the phase diagram shown above is ________ °C.

Correct AnswerverifiedShow Answer

In which of the following molecules is hydrogen bonding likely to be the most significant component of the total intermolecular forces?

Correct AnswerverifiedShow Answer

Of the following, ________ is the least volatile.

Correct AnswerverifiedShow Answer

-On the phase diagram shown above, the coordinates of point ________ correspond to the critical temperature and pressure.

Correct AnswerverifiedShow Answer

Which of the following molecules has hydrogen bonding as its only intermolecular force?

Correct AnswerverifiedShow Answer

The intermolecular force(s) responsible for the fact that CH4 has the lowest boiling point in the set CH4, SiH4, GeH4, SnH4 is/are ________.

Correct AnswerverifiedShow Answer

What types of intermolecular forces exist between NH3 and HF?

Correct AnswerverifiedShow Answer

For a given substance that exhibits liquid-crystalline properties, the transition from solid to liquid-crystal state occurs ________.

Correct AnswerverifiedShow Answer

What is the predominant intermolecular force in H2NNH2?

Correct AnswerverifiedShow Answer

-The phase changes B → C and D → E are not associated with temperature increases because the heat energy is used up to ________.

Correct AnswerverifiedShow Answer

In liquids, the attractive intermolecular forces are ________.

Correct AnswerverifiedShow Answer

What intermolecular force is responsible for the fact that ice is less dense than liquid water?

Correct AnswerverifiedShow Answer

How high a liquid will rise up a narrow tube as a result of capillary action depends on ________.

Correct AnswerverifiedShow Answer

What type(s) of intermolecular forces exist between Br₂ and CCl₄?

Correct Answer
verified

Correct Answer
verified

Boron triiodide (BI₃) melts at 49.9 °C and boils at 209.5 °C at a constant pressure of 1 atm. What state of matter must a sample of boron triiodide be in at 100°C and 1 atm?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

As a gaseous element condenses, the atoms become and they have attraction for one another.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The intermolecular force(s) responsible for the fact that CH₄ has the lowest boiling point in the set CH₄, SiH₄, GeH₄, SnH₄ is/are ________.

Correct Answer
verified

What types of intermolecular forces exist between NH₃ and HF?

Correct Answer
verified

Correct Answer
verified

What is the predominant intermolecular force in H₂NNH₂?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified