Question 1

Determine the normal boiling point of a substance whose vapour pressure is 73.46 mbar at 35 °C and has a ΔvapH of 32.1 kJ mol-1.

Accepted Answer

A)  255 K
B)  368 K
C)  412 K
D)  390.K
E)  466 K

Question 2

Lithium crystallizes in a body-centred cubic structure.What is the coordination number of each atom?

Accepted Answer

A)  4
B)  6
C)  8
D)  12

Question 3

Place the following compounds in order of decreasing strength of intermolecular forces. 
HF  \quad O2  \quad CO2

Accepted Answer

A)  HF > CO2 > O2
B)  HF > O2 > CO2 
C)  O2 > CO2 > HF
D)  CO2 > HF > O2
E)  CO2 > O2 > HF

Question 4

Which of the following is considered an ionic solid?

Accepted Answer

A)  (NH4) 2CO3
B)  CCl4
C)  SeBr2
D)  XeF4
E)  None of these is an ionic solid.

Question 5

What is the strongest type of intermolecular force present in NH2CH3?

Accepted Answer

A)  dispersion
B)  dipole-dipole
C)  hydrogen bonding
D)  ion-dipole
E)  none of the above

Question 6

Place the following substances in order of decreasing boiling point. 
N2  \quad O2  \quad H2

Accepted Answer

A)  O2 > H2 > N2
B)  N2 > H2 > O2
C)  N2 > O2 > H2
D)  O2 > N2 > H2
E)  H2 > N2 > O2

Question 7

Place the following substances in order of decreasing vapour pressure at a given temperature. 
BeF2  \quad CH3OH  \quad OF2

Accepted Answer

A)  CH3OH > OF2 > BeF2
B)  BeF2 > OF2 > CH3OH
C)  OF2 > CH3OH > BeF2
D)  OF2 > BeF2 > CH3OH
E)  BeF2 > CH3OH > OF2

Question 8

Identify the type of solid for diamond.

Accepted Answer

A)  metallic atomic solid
B)  ionic solid
C)  nonbonding atomic solid
D)  molecular solid
E)  networking atomic solid

Question 9

Choose the compound that exhibits hydrogen bonding as its strongest intermolecular force.

Accepted Answer

A)  SCl2
B)  C2H6
C)  CH3OH
D)  CH2F2
E)  None of the above compounds exhibit hydrogen bonding.

Question 10

How much energy is required to vaporize 98.6 g of ethanol (C2H5OH) at its boiling point if its ΔvapH is 40.5 kJ mol-1?

Accepted Answer

A)  86.7 kJ
B)  11.5 kJ
C)  18.9 kJ
D)  52.8 kJ
E)  39.9 kJ

Question 11

Which is expected to have the largest dispersion forces?

Accepted Answer

A)  C2H4
B)  C8H16
C)  Cl2
D)  N2H4

Question 12

Which substance below has the strongest intermolecular forces?

Accepted Answer

A)  A2X,ΔvapH = 39.6 kJ mol-1
B)  BY2,ΔvapH = 26.7 kJ mol-1
C)  C3X2,ΔvapH = 36.4 kJ mol-1
D)  DX2,ΔvapH = 23.3 kJ mol-1
E)  EY3,ΔvapH = 21.5 kJ mol-1

Question 13

Define boiling.

Accepted Answer

A)  A liquid becomes a gas.
B)  A gas becomes a liquid.
C)  A gas becomes a solid.
D)  A solid becomes a gas.
E)  A solid becomes a liquid.

Question 14

Identify the substance with the highest viscosity in the liquid phase.

Accepted Answer

A)  gasoline
B)  water
C)  corn syrup
D)  motor oil
E)  tea

Question 15

Identify the type of solid for gold.

Accepted Answer

A)  metallic atomic solid
B)  ionic solid
C)  nonbonding atomic solid
D)  molecular solid
E)  networking atomic solid

Question 16

Which of the following statements is TRUE?

Accepted Answer

A)  Intermolecular forces are generally stronger than bonding forces.
B)  The potential energy of molecules decrease as they get closer to one another.
C)  Energy is given off when the attraction between two molecules is broken.
D)  Increasing the pressure on a solid usually causes it to become a liquid.
E)  None of the above is true.

Question 17

What is the strongest type of intermolecular force present in CHF3?

Accepted Answer

A)  ion-dipole
B)  dispersion
C)  hydrogen bonding
D)  dipole-dipole
E)  none of the above

Question 18

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 pm

Question 19

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

Accepted Answer

A)  CO2
B)  BeCl2
C)  BF3
D)  He
E)  PF5

Question 20

-Based on the figure above,the boiling point of diethyl ether under an external pressure of 1.32   bar 	ext { bar } bar   is ________ °C.

Accepted Answer

A)  10
B)  20
C)  30
D)  40
E)  0

Exam 11: Liquids, solids, and Intermolecular Forces

Determine the normal boiling point of a substance whose vapour pressure is 73.46 mbar at 35 °C and has a ΔvapH of 32.1 kJ mol-1.

Correct AnswerverifiedShow Answer

-Based on the figure above,the boiling point of diethyl ether under an external pressure of 1.32 bar \text { bar } bar is ________ °C.

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 statements is TRUE?

Correct AnswerverifiedShow Answer

Define boiling.

Correct AnswerverifiedShow Answer

Which is expected to have the largest dispersion forces?

Correct AnswerverifiedShow Answer

Identify the type of solid for gold.

Correct AnswerverifiedShow Answer

Place the following substances in order of decreasing vapour pressure at a given temperature. BeF2 \quad CH3OH \quad OF2

Correct AnswerverifiedShow Answer

What is the strongest type of intermolecular force present in CHF3?

Correct AnswerverifiedShow Answer

Identify the type of solid for diamond.

Correct AnswerverifiedShow Answer

How much energy is required to vaporize 98.6 g of ethanol (C2H5OH) at its boiling point if its ΔvapH is 40.5 kJ mol-1?

Correct AnswerverifiedShow Answer

What is the strongest type of intermolecular force present in NH2CH3?

Correct AnswerverifiedShow Answer

Choose the compound that exhibits hydrogen bonding as its strongest intermolecular force.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Lithium crystallizes in a body-centred cubic structure.What is the coordination number of each atom?

Correct AnswerverifiedShow Answer

Which of the following is considered an ionic solid?

Correct AnswerverifiedShow Answer

Identify the substance with the highest viscosity in the liquid phase.

Correct AnswerverifiedShow Answer

Place the following substances in order of decreasing boiling point. N2 \quad O2 \quad H2

Correct AnswerverifiedShow Answer

Place the following compounds in order of decreasing strength of intermolecular forces. HF \quad O2 \quad CO2

Correct AnswerverifiedShow Answer

Which substance below has the strongest intermolecular forces?

Correct AnswerverifiedShow Answer

Determine the normal boiling point of a substance whose vapour pressure is 73.46 mbar at 35 °C and has a Δ_vapH of 32.1 kJ mol^-1.

Correct Answer
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$-Based on the figure above,the boiling point of diethyl ether under an external pressure of 1.32 \text { bar } is °C. A) 10 B) 20 C) 30 D) 40 E) 0$ -Based on the figure above,the boiling point of diethyl ether under an external pressure of 1.32 $\text { bar }$ is °C.

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Place the following substances in order of decreasing vapour pressure at a given temperature. BeF₂ $\quad$ CH₃OH $\quad$ OF₂

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What is the strongest type of intermolecular force present in CHF₃?

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How much energy is required to vaporize 98.6 g of ethanol (C₂H₅OH) at its boiling point if its Δ_vapH is 40.5 kJ mol^-1?

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What is the strongest type of intermolecular force present in NH₂CH₃?

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Place the following substances in order of decreasing boiling point. N₂ $\quad$ O₂ $\quad$ H₂

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Place the following compounds in order of decreasing strength of intermolecular forces. HF $\quad$ O₂ $\quad$ CO₂

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