Question 1

Identify the compound that does not have hydrogen bonding.

Accepted Answer

A)  (CH3)3N 
B)  H2O 
C)  CH3OH 
D)  HF 
E)  CH3NH2 
A)  (CH3)3N 
B)  H2O 
C)  CH3OH 
D)  HF 
E)  CH3NH2

Question 2

An unknown substance has a boiling point of 150°C at 650 torr,and a boiling point of 195°C at 780 torr.What is the heat of vaporization?

Accepted Answer

A)  22.2 kJ/mol 
B)  12.6 kJ/mol 
C)  6.67 kJ/mol 
D)  29.4 kJ/mol 
E)  18.4 kJ/mol 
A)  22.2 kJ/mol 
B)  12.6 kJ/mol 
C)  6.67 kJ/mol 
D)  29.4 kJ/mol 
E)  18.4 kJ/mol

Question 3

The boiling point of H2O is much higher than that of the analogous molecule H2S.This is mostly due to

Accepted Answer

A)  dispersion forces being much stronger in H2S than in H2O. 
B)  dipole-dipole forces being much stronger in H2S than in H2O. 
C)  hydrogen bonding being much stronger in H2S than in H2O. 
D)  dipole-dipole forces being much stronger in H2O than in H2S. 
E)  hydrogen bonding being much stronger in H2O than in H2S. 
A)  dispersion forces being much stronger in H2S than in H2O. 
B)  dipole-dipole forces being much stronger in H2S than in H2O. 
C)  hydrogen bonding being much stronger in H2S than in H2O. 
D)  dipole-dipole forces being much stronger in H2O than in H2S. 
E)  hydrogen bonding being much stronger in H2O than in H2S.

Question 4

Choose the pair of substances that are most likely to form a homogeneous solution.

Accepted Answer

A)  K I and Hg 
B)  Li Cl and C6H14 
C)  C3H8 and C2H5OH 
D)  F2 and PF3 
E)  NH3 and CH3OH 
A)  K I and Hg 
B)  Li Cl and C6H14 
C)  C3H8 and C2H5OH 
D)  F2 and PF3 
E)  NH3 and CH3OH

Question 5

Choose the substance with the highest viscosity.

Accepted Answer

A)  water at 10°C 
B)  water at 20°C 
C)  water at 30°C 
D)  water at 40°C 
E)  water at 50°C 
A)  water at 10°C 
B)  water at 20°C 
C)  water at 30°C 
D)  water at 40°C 
E)  water at 50°C

Question 6

The fluorocarbon C2CL3F3 has a normal boiling point of 47.6°C.The specific heats of C2CL3F3(1)and C2CL3F3(g)are 0.91 J/gK and 0.67 J/gK,respectively.The heat of vaporization of the compound is 27.49 kJ/mol.The heat required to convert 50.0 g of the compound from the liquid at   to the gas at 80.0°C is ________ kJ.

Accepted Answer

A)  8.19 
B)  1454 
C)  30.51 
D)  3031 
E)  10.36 
A)  8.19 
B)  1454 
C)  30.51 
D)  3031 
E)  10.36

Question 7

Define fusion.

Accepted Answer

A)  the phase transition from solid to liquid 
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 solid 
A)  the phase transition from solid to liquid 
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 solid

Question 8

Determine the normal boiling point of a substance whose vapor pressure is 55.1 mm Hg at 35°C and has a ΔHvap of 32.1 kJ/mol.

Accepted Answer

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

Question 9

Place the following substances in order of decreasing vapor pressure at a given temperature. PF5 BrF3 CF4

Accepted Answer

A)  BrF3 > PF5 > CF4 
B)  BrF3 > CF4 > PF5 
C)  PF5 > BrF3 > CF4 
D)  CF4 > BrF3 > PF5 
E)  CF4 > PF5 > BrF3 
A)  BrF3 > PF5 > CF4 
B)  BrF3 > CF4 > PF5 
C)  PF5 > BrF3 > CF4 
D)  CF4 > BrF3 > PF5 
E)  CF4 > PF5 > BrF3

Question 10

Choose the pair of substances that are most likely to form a homogeneous solution.

Accepted Answer

A)  C6H14 and C10H20 
B)  K Cl and C5H12 
C)  N2O4 and NH4I 
D)  C6H14 and H2O 
E)  None of the pairs above will form a homogeneous solution. 
A)  C6H14 and C10H20 
B)  K Cl and C5H12 
C)  N2O4 and NH4I 
D)  C6H14 and H2O 
E)  None of the pairs above will form a homogeneous solution.

Question 11

The forces between polar molecules is known as

Accepted Answer

A)  hydrogen bonding. 
B)  ion-dipole forces. 
C)  dipole-dipole forces. 
D)  dispersion forces. 
E)  ionic forces. 
A)  hydrogen bonding. 
B)  ion-dipole forces. 
C)  dipole-dipole forces. 
D)  dispersion forces. 
E)  ionic forces.

Question 12

Define deposition.

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. 
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 13

Identify the compound that does not have dipole-dipole forces as its strongest force.

Accepted Answer

A)  CH2Br2 
B)  CH3OCH3 
C)  CH3Cl 
D)  HCBr3 
E)  CO2 
A)  CH2Br2 
B)  CH3OCH3 
C)  CH3Cl 
D)  HCBr3 
E)  CO2

Question 14

The freezing point of water is

Accepted Answer

A)  32oF 
B)  32oC 
C)  212oC 
D)  100°C 
E)  273°C 
A)  32oF 
B)  32oC 
C)  212oC 
D)  100°C 
E)  273°C

Question 15

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

Accepted Answer

A)  The triple point of this substance occurs at a temperature of 31°C. 
B)  At 10 atm 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 ΔHvap. 
E)  None of the above are true. 
A)  The triple point of this substance occurs at a temperature of 31°C. 
B)  At 10 atm 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 ΔHvap. 
E)  None of the above are true.

Question 16

How much energy is required to vaporize 98.6 g of ethanol (C2H5OH)at its boiling point,if its ΔHvap is 40.5 kJ/mol?

Accepted Answer

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

Question 17

Consider the phase diagram shown below.If you start at 0.75 atm and 0 °C,and move to 0.10 atm and 25C,you will move from the ________ phase to the ________ phase.

Accepted Answer

A)  liquid, gas 
B)  gas, gas 
C)  liquid, liquid 
D)  gas, solid 
E)  liquid, solid 
A)  liquid, gas 
B)  gas, gas 
C)  liquid, liquid 
D)  gas, solid 
E)  liquid, solid

Question 18

Based on the figure above,the boiling point of diethyl ether under an external pressure of   is ________ °C.

Accepted Answer

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

Question 19

How much energy is required to vaporize 48.7 g of dichloromethane (CH2Cl2)at its boiling point,if its ΔHvap is 31.6 kJ/mol?

Accepted Answer

A)  31.2 kJ 
B)  6.49 kJ 
C)  55.1 kJ 
D)  15.4 kJ 
E)  18.1 kJ 
A)  31.2 kJ 
B)  6.49 kJ 
C)  55.1 kJ 
D)  15.4 kJ 
E)  18.1 kJ

Question 20

Which of the following compounds has dipole-dipole interactions as the strongest intermolecular force?

Accepted Answer

A)  Br2 
B)  CH3Br 
C)  CBr4 
D)  BrCH2CH2OH 
A)  Br2 
B)  CH3Br 
C)  CBr4 
D)  BrCH2CH2OH

Exam 12: Liquids, Solids, and Intermolecular Forces

Identify the compound that does not have hydrogen bonding.

An unknown substance has a boiling point of 150°C at 650 torr,and a boiling point of 195°C at 780 torr.What is the heat of vaporization?

The boiling point of H2O is much higher than that of the analogous molecule H2S.This is mostly due to

Choose the pair of substances that are most likely to form a homogeneous solution.

Choose the substance with the highest viscosity.

Define fusion.

Determine the normal boiling point of a substance whose vapor pressure is 55.1 mm Hg at 35°C and has a ΔHvap of 32.1 kJ/mol.

Place the following substances in order of decreasing vapor pressure at a given temperature. PF5 BrF3 CF4

Choose the pair of substances that are most likely to form a homogeneous solution.

The forces between polar molecules is known as

Define deposition.

Identify the compound that does not have dipole-dipole forces as its strongest force.

The freezing point of water is

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

How much energy is required to vaporize 98.6 g of ethanol (C2H5OH)at its boiling point,if its ΔHvap is 40.5 kJ/mol?

Consider the phase diagram shown below.If you start at 0.75 atm and 0 °C,and move to 0.10 atm and 25C,you will move from the ________ phase to the ________ phase.

Based on the figure above,the boiling point of diethyl ether under an external pressure of is ________ °C.

How much energy is required to vaporize 48.7 g of dichloromethane (CH2Cl2)at its boiling point,if its ΔHvap is 31.6 kJ/mol?

Which of the following compounds has dipole-dipole interactions as the strongest intermolecular force?

Essentials: Units, Measurements, and Problem Solving

Atoms

The Quantum Mechanical Model of the Atom

Periodic Properties of the Elements

Molecules and Compounds

Chemical Bonding I

Chemical Bonding Ii

Chemical Reactions and Chemical Quantities

Introduction to Solutions and Aqueous Reactions

Thermochemistry

Gases

Crystalline Solids and Modern Materials

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Organic Chemistry

Transition Metals and Coordination Compounds

Filters

The boiling point of H₂O is much higher than that of the analogous molecule H₂S.This is mostly due to

Determine the normal boiling point of a substance whose vapor pressure is 55.1 mm Hg at 35°C and has a ΔH_vap of 32.1 kJ/mol.

Place the following substances in order of decreasing vapor pressure at a given temperature. PF₅ BrF₃ CF₄

How much energy is required to vaporize 98.6 g of ethanol (C₂H₅OH)at its boiling point,if its ΔH_vap is 40.5 kJ/mol?

Consider the phase diagram shown below.If you start at 0.75 atm and 0 °C,and move to 0.10 atm and 25C,you will move from the phase to the phase.

How much energy is required to vaporize 48.7 g of dichloromethane (CH₂Cl₂)at its boiling point,if its ΔH_vap is 31.6 kJ/mol?