Question 1

Suppose the atoms in a two-dimensional crystal have the following arrangement:  On the drawing above, sketch the unit cell of this crystal.

Accepted Answer

The answer of Suppose the atoms in a two-dimensional crystal...

Question 2

Of the given pair of compounds, which would have the higher boiling point?
C3H8 or CH3OCH3

Accepted Answer

Question 3

Silver metal crystallizes in a face-centered cubic lattice with L as the length of one edge of the unit cube. The center-to-center distance between nearest silver atoms is

Accepted Answer

A)  L/2.
B)   
C)  2L.
D)   
E)  None of the above.F) B) and C)
G) A) and B) D

Question 4

The molar enthalpy of vaporization of carbon disulfide is 26.74 kJ/mol, and its normal boiling point is 46°C. What is the vapor pressure of CS2 at 0°C?

Accepted Answer

A)  447 torr
B)  4160 torr
C)  313 torr
D)  139 torr
E)  5.47 torrF) All of the above
G) D) and E)

Question 5

Crystals of elemental sulfur are easily crushed, and melt at 113°C. Liquid sulfur does not conduct electricity. What kind of crystal is this?

Accepted Answer

The answer of Crystals of elemental sulfur are easily crushed,...

Question 6

The vapor pressure of ethanol is 400 mmHg at 63.5°C. Its molar heat of vaporization is 39.3 kJ/mol. What is vapor pressure of ethanol, in mmHg, at 34.9°C?

Accepted Answer

A)  1,510 mmHg
B)  100 mmHg
C)  200 mmHg
D)  0.0099 mmHg
E)  4.61 mmHgF) B) and E)
G) A) and E)

Question 7

Which of the following substances should have the highest boiling point?

Accepted Answer

A)  CH4
B)  Cl2
C)  Kr
D)  CH3Cl
E)  N2F) B) and E)
G) A) and B) D

Question 8

Suppose the atoms in a two-dimensional crystal have the following arrangement:  What is the coordination number of each atom in this crystal?

Accepted Answer

The answer of Suppose the atoms in a two-dimensional crystal...

Question 9

Which of the following would be expected to have the highest vapor pressure at room temperature?

Accepted Answer

A)  ethanol, bp = 78°C
B)  methanol, bp = 65°C
C)  water, bp = 100°C
D)  acetone, bp = 56°CE) A) and B)
F) B) and C)

Question 10

Methane has a heat of fusion of 0.84 kJ/mol and a heat of vaporization of 9.2 kJ/mol. Estimate the value for the heat of sublimation.

Accepted Answer

The answer of Methane has a heat of fusion of...

Question 11

Of the pair of compounds given, which would have the stronger intermolecular forces of attraction?
NH3 or PH3

Accepted Answer

Question 12

Iron crystallizes in a body-centered cubic unit. The edge of this cell is 287 pm. Calculate the density of iron.

Accepted Answer

The answer of Iron crystallizes in a body-centered cubic unit....

Question 13

Indicate all the types of intermolecular forces of attraction in CH3OH(l).

Accepted Answer

hydrogen bonding and dispersion

Question 14

Of the given pair of compounds, which would have the higher boiling point?
NH3 or CH4

Accepted Answer

Question 15

Given the following compound and its boiling point, identify whether it is polar or nonpolar: F2, -188.1°C.

Accepted Answer

Question 16

Krypton has a higher melting point than argon because of its

Accepted Answer

A)  hydrogen bonding.
B)  stronger dispersion forces.
C)  permanent dipole moment.
D)  ionic bonds.
E)  greater ionization energy.F) C) and D)
G) A) and C)

Question 17

A liquid boils when its

Accepted Answer

A)  vapor pressure is exactly 1 atmosphere.
B)  vapor pressure is equal to, or greater than, the external pressure pushing on it.
C)  temperature is equal to 273 K (standard temperature) .
D)  temperature is greater than room temperature.E) A) and B)
F) All of the above

Question 18

Which of the following atoms does not participate in hydrogen bonding?

Accepted Answer

A)  S
B)  O
C)  F
D)  NE) A) and B)
F) A) and C)

Question 19

MgO has the same crystal structure as NaCl, face-centered cubic. How many oxide ions surround each Mg2+ ion as nearest neighbors?

Accepted Answer

A)  4
B)  6
C)  8
D)  10
E)  12F) C) and D)
G) A) and D)

Question 20

The normal boiling point of bromine is 58.8°C. Given that the vapor pressure of bromine is 75.0 torr at 2.5°C, calculate the molar enthalpy of vaporization of bromine.

Accepted Answer

A)  3.76 kJ/mol
B)  31.3 kJ/mol
C)  2.90 kJ/mol
D)  3.57 kJ/mol
E)  29.7 kJ/molF) A) and B)
G) B) and D)

Exam 12: Intermolecular Forces and Liquids and Solids

Suppose the atoms in a two-dimensional crystal have the following arrangement: On the drawing above, sketch the unit cell of this crystal.

Correct AnswerverifiedShow Answer

Of the given pair of compounds, which would have the higher boiling point? C3H8 or CH3OCH3

Correct AnswerverifiedShow Answer

Silver metal crystallizes in a face-centered cubic lattice with L as the length of one edge of the unit cube. The center-to-center distance between nearest silver atoms is

Correct AnswerverifiedD

The molar enthalpy of vaporization of carbon disulfide is 26.74 kJ/mol, and its normal boiling point is 46°C. What is the vapor pressure of CS2 at 0°C?

Correct AnswerverifiedShow Answer

Crystals of elemental sulfur are easily crushed, and melt at 113°C. Liquid sulfur does not conduct electricity. What kind of crystal is this?

Correct AnswerverifiedShow Answer

The vapor pressure of ethanol is 400 mmHg at 63.5°C. Its molar heat of vaporization is 39.3 kJ/mol. What is vapor pressure of ethanol, in mmHg, at 34.9°C?

Correct AnswerverifiedShow Answer

Which of the following substances should have the highest boiling point?

Correct AnswerverifiedD

Suppose the atoms in a two-dimensional crystal have the following arrangement: What is the coordination number of each atom in this crystal?

Correct AnswerverifiedShow Answer

Which of the following would be expected to have the highest vapor pressure at room temperature?

Correct AnswerverifiedShow Answer

Methane has a heat of fusion of 0.84 kJ/mol and a heat of vaporization of 9.2 kJ/mol. Estimate the value for the heat of sublimation.

Correct AnswerverifiedShow Answer

Of the pair of compounds given, which would have the stronger intermolecular forces of attraction? NH3 or PH3

Correct AnswerverifiedShow Answer

Iron crystallizes in a body-centered cubic unit. The edge of this cell is 287 pm. Calculate the density of iron.

Correct AnswerverifiedShow Answer

Indicate all the types of intermolecular forces of attraction in CH3OH(l).

Correct Answerverifiedhydrogen bonding and dispersion

Of the given pair of compounds, which would have the higher boiling point? NH3 or CH4

Correct AnswerverifiedShow Answer

Given the following compound and its boiling point, identify whether it is polar or nonpolar: F2, -188.1°C.

Correct AnswerverifiedShow Answer

Krypton has a higher melting point than argon because of its

Correct AnswerverifiedShow Answer

A liquid boils when its

Correct AnswerverifiedShow Answer

Which of the following atoms does not participate in hydrogen bonding?

Correct AnswerverifiedShow Answer

MgO has the same crystal structure as NaCl, face-centered cubic. How many oxide ions surround each Mg2+ ion as nearest neighbors?

Correct AnswerverifiedShow Answer

The normal boiling point of bromine is 58.8°C. Given that the vapor pressure of bromine is 75.0 torr at 2.5°C, calculate the molar enthalpy of vaporization of bromine.

Correct AnswerverifiedShow Answer

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Of the given pair of compounds, which would have the higher boiling point? C₃H₈ or CH₃OCH₃

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D

The molar enthalpy of vaporization of carbon disulfide is 26.74 kJ/mol, and its normal boiling point is 46°C. What is the vapor pressure of CS₂ at 0°C?

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D

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Of the pair of compounds given, which would have the stronger intermolecular forces of attraction? NH₃ or PH₃

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Indicate all the types of intermolecular forces of attraction in CH₃OH(l).

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hydrogen bonding and dispersion

Of the given pair of compounds, which would have the higher boiling point? NH₃ or CH₄

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Given the following compound and its boiling point, identify whether it is polar or nonpolar: F₂, -188.1°C.

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MgO has the same crystal structure as NaCl, face-centered cubic. How many oxide ions surround each Mg²⁺ ion as nearest neighbors?

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