Question 1

What is the packing efficiency in simple cubic unit cells?

Accepted Answer

A)   74%
B)   86%
C)   68%
D)   52%
E)   24%F) B) and E)
G) None of the above

Question 2

Place the following compounds in order of increasing strength of intermolecular forces. CH4 CH3CH2CH3 CH3CH3

Accepted Answer

A)   CH3CH2CH3 4 3CH3
B)   CH3CH2CH3 3CH3 4
C)   CH3CH3 4 3CH2CH3
D)   CH4 3CH2CH3 3CH3
E)   CH4 3CH3 3CH2CH3F) B) and E)
G) A) and B)

Question 3

The melting point of water is ________.

Accepted Answer

A)   0 °C
B)   32 °C
C)   212 °C
D)   100 °C
E)   273 °CF) All of the above
G) C) and D)

Question 4

Place the following substances in order of increasing vapour pressure at a given temperature. NF3 NH3 BCl3

Accepted Answer

A)   NH3 3 3
B)   NF3 3 3
C)   BCl3 3 3
D)   NH3 3 3
E)   BCl3 3 3F) B) and C)
G) A) and E)

Question 5

Consider the phase diagram shown. Choose the statement below that is TRUE. vapH." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   The triple point of this substance occurs at a temperature of 31 °C.
B)   At 10 bar of pressure, there is no temperature where the liquid phase of this substance would exist.
C)   The solid phase of this substance is higher in density than the liquid phase.
D)   The line separating the solid and liquid phases represents the ΔvapH.E) C) and D)
F) All of the above

Question 6

Identify the characteristics of a liquid.

Accepted Answer

A)   indefinite shape and volume
B)   indefinite shape, but definite volume
C)   definite shape and volume
D)   definite shape and indefinite volumeE) A) and D)
F) A) and C)

Question 7

Which is expected to have the largest dispersion forces?

Accepted Answer

A)   C2H4
B)   C8H16
C)   Cl2
D)   N2H4E) C) and D)
F) A) and B)

Question 8

Choose the substance with the lowest vapour pressure at a given temperature.

Accepted Answer

A)   CO2
B)   BeCl2
C)   BF3
D)   He
E)   PF5F) A) and B)
G) A) and D)

Question 9

Choose the substance with the highest vapour pressure at a given temperature.

Accepted Answer

A)   SiS2
B)   RbCl
C)   CH3SCH3
D)   BF3
E)   SbH3F) A) and D)
G) A) and E)

Question 10

What is the edge length of a face-centred cubic unit cell made up of atoms having a radius of 128 pm?

Accepted Answer

A)   181 pm
B)   362 pm
C)   512 pm
D)   1020 pmE) B) and D)
F) None of the above

Question 11

Which of the following compounds has the highest boiling point?

Accepted Answer

A)   H2O
B)   H Cl
C)   H2S 
D)   N H3E) All of the above
F) A) and B)

Question 12

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

Accepted Answer

A)   CO2
B)   SrS
C)   Xe
D)   F2
E)   MgOF) A) and D)
G) D) and E)

Question 13

Which of the following statements is FALSE?

Accepted Answer

A)   The rate of vaporization increases with increasing surface area.
B)   The rate of vaporization increases with decreasing strength of intermolecular forces.
C)   The rate of vaporization increases with increasing temperature.
D)   Molecules with hydrogen bonding are more volatile than compounds with dipole-dipole forces.E) A) and C)
F) A) and D)

Question 14

Why do O, F and N, when bonded to H, form such strong intermolecular attractions to neighbouring molecules? Make sure to be specific.

Accepted Answer

Oxygen, fluorine, and nitrogen are all v...

Question 15

Which one of the following has a definite shape and volume?

Accepted Answer

A)   gas
B)   liquid
C)   solid
D)   none of the aboveE) A) and D)
F) A) and C)

Question 16

Which of the following forms a molecular solid?

Accepted Answer

A)   NH4NO3
B)   C6H4Cl2
C)   SiO2
D)   copperE) B) and C)
F) None of the above

Question 17

Define sublimation.

Accepted Answer

A)   the phase transition from solid to gas
B)   the phase transition from gas to solid
C)   the phase transition from gas to liquid
D)   the phase transition from liquid to gas
E)   the phase transition from liquid to solidF) B) and D)
G) A) and C)

Question 18

Why does the temperature of a substance stay constant during a phase change such as vaporization?

Accepted Answer

The energy added to the substance is not...

Question 19

Determine ΔvapH for a compound that has a measured vapour pressure of 32.40 mbar at 273 K and 180.0 mbar at 325 K.

Accepted Answer

A)   41 kJ mol-1
B)   79 kJ mol-1
C)   24 kJ mol-1
D)   13 kJ mol-1
E)   34 kJ mol-1F) C) and E)
G) B) and E)

Question 20

How much heat is released when 105 g of steam at 100.0 °C is cooled to ice at -15.0 °C? The enthalpy of vaporization of water is 40.67 kJ mol-1, the enthalpy of fusion for water is 6.01 kJ mol-1, the molar heat capacity of liquid water is 75.4 J mol-1 °C-1, and the molar heat capacity of ice is 36.4 J mol-1 °C-1.

Accepted Answer

A)   54.8 kJ
B)   273 kJ
C)   319 kJ
D)   347 kJE) A) and B)
F) A) and C)

Exam 11: Liquids, Solids, and Intermolecular Forces

Determine Δ_vapH for a compound that has a measured vapour pressure of 32.40 mbar at 273 K and 180.0 mbar at 325 K.

Correct Answer
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Which is expected to have the largest dispersion forces?

Correct Answer
verified

Why does the temperature of a substance stay constant during a phase change such as vaporization?

Correct Answer
verified
The energy added to the substance is not...
View Answer

Consider the phase diagram shown. Choose the statement below that is TRUE.

Correct Answer
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Which of the following substances should have the highest melting point?

Correct Answer
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Correct Answer
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Which of the following statements is FALSE?

Correct Answer
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Define sublimation.

Correct Answer
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Choose the substance with the lowest vapour pressure at a given temperature.

Correct Answer
verified

Which one of the following has a definite shape and volume?

Correct Answer
verified

Why do O, F and N, when bonded to H, form such strong intermolecular attractions to neighbouring molecules? Make sure to be specific.

Correct Answer
verified
Oxygen, fluorine, and nitrogen are all v...
View Answer

Which of the following compounds has the highest boiling point?

Correct Answer
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Identify the characteristics of a liquid.

Correct Answer
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Choose the substance with the highest vapour pressure at a given temperature.

Correct Answer
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Place the following substances in order of increasing vapour pressure at a given temperature. NF₃ NH₃BCl₃

Correct Answer
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The melting point of water is ________.

Correct Answer
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Place the following compounds in order of increasing strength of intermolecular forces. CH₄ CH₃CH₂CH₃ CH₃CH₃

Correct Answer
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What is the packing efficiency in simple cubic unit cells?

Correct Answer
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What is the edge length of a face-centred cubic unit cell made up of atoms having a radius of 128 pm?

Correct Answer
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Which of the following forms a molecular solid?

Correct Answer
verified

Exam 11: Liquids, Solids, and Intermolecular Forces

Determine ΔvapH for a compound that has a measured vapour pressure of 32.40 mbar at 273 K and 180.0 mbar at 325 K.

Correct AnswerverifiedShow Answer

Which is expected to have the largest dispersion forces?

Correct AnswerverifiedShow Answer

Why does the temperature of a substance stay constant during a phase change such as vaporization?

Correct AnswerverifiedThe energy added to the substance is not...View AnswerShow Answer

Consider the phase diagram shown. Choose the statement below that is TRUE.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following statements is FALSE?

Correct AnswerverifiedShow Answer

Define sublimation.

Correct AnswerverifiedShow Answer

Choose the substance with the lowest vapour pressure at a given temperature.

Correct AnswerverifiedShow Answer

Which one of the following has a definite shape and volume?

Correct AnswerverifiedShow Answer

Why do O, F and N, when bonded to H, form such strong intermolecular attractions to neighbouring molecules? Make sure to be specific.

Correct AnswerverifiedOxygen, fluorine, and nitrogen are all v...View AnswerShow Answer

Which of the following compounds has the highest boiling point?

Correct AnswerverifiedShow Answer

Identify the characteristics of a liquid.

Correct AnswerverifiedShow Answer

Choose the substance with the highest vapour pressure at a given temperature.

Correct AnswerverifiedShow Answer

Place the following substances in order of increasing vapour pressure at a given temperature. NF3 NH3 BCl3

Correct AnswerverifiedShow Answer

The melting point of water is ________.

Correct AnswerverifiedShow Answer

Place the following compounds in order of increasing strength of intermolecular forces. CH4 CH3CH2CH3 CH3CH3

Correct AnswerverifiedShow Answer

What is the packing efficiency in simple cubic unit cells?

Correct AnswerverifiedShow Answer

What is the edge length of a face-centred cubic unit cell made up of atoms having a radius of 128 pm?

Correct AnswerverifiedShow Answer

Which of the following forms a molecular solid?

Correct AnswerverifiedShow Answer

Determine Δ_vapH for a compound that has a measured vapour pressure of 32.40 mbar at 273 K and 180.0 mbar at 325 K.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
The energy added to the substance is not...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Oxygen, fluorine, and nitrogen are all v...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Place the following substances in order of increasing vapour pressure at a given temperature. NF₃ NH₃BCl₃

Correct Answer
verified

Correct Answer
verified

Place the following compounds in order of increasing strength of intermolecular forces. CH₄ CH₃CH₂CH₃ CH₃CH₃

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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