Question 1

The strongest intermolecular interactions between pentane (C5H12) molecules arise from

Accepted Answer

A)  dipole-dipole forces. 
B)  London dispersion forces. 
C)  hydrogen bonding. 
D)  ion-dipole interactions. 
E)  carbon-carbon bonds. 
A)  dipole-dipole forces. 
B)  London dispersion forces. 
C)  hydrogen bonding. 
D)  ion-dipole interactions. 
E)  carbon-carbon bonds.

Question 2

Liquid ammonia can be used as a refrigerant and heat transfer fluid. How much energy is required to heat 25.0 g of NH3(l) from -65.0°C to -12.0°C?

Accepted Answer

A)  4.92 kJ 
B)  16.0 kJ 
C)  34.5 kJ 
D)  39.4 kJ 
E)  182.8 kJ 
A)  4.92 kJ 
B)  16.0 kJ 
C)  34.5 kJ 
D)  39.4 kJ 
E)  182.8 kJ

Question 3

Solids are generally most stable in crystalline form.

Accepted Answer

A) True 
 B)False

Question 4

Consider the phase diagram shown below.   a. What phase(s) is/are present at point A?
b. What phase(s) is/are present at point B?
c. Name point C and explain its significance.
d. Starting at D, if the pressure is lowered while the temperature remains constant, describe what will happen.

Accepted Answer

a. liquid
b. solid, liquid, and gas
c. C

Question 5

Which one of the following pure substances will exhibit hydrogen bonding?

Accepted Answer

A)  CH4 
B)  H2C=CH2 
C)  H2O 
D)  CHCl3 
E)  CHF3 
A)  CH4 
B)  H2C=CH2 
C)  H2O 
D)  CHCl3 
E)  CHF3

Question 6

Which substance has the lowest vapor pressure at room temperature?

Accepted Answer

A)  HF 
B)  HCl 
C)  HBr 
D)  HI 
E)  H2 
A)  HF 
B)  HCl 
C)  HBr 
D)  HI 
E)  H2

Question 7

What name is given to the phenomenon where a thin film of water contracts and adheres to the wall of a glass cylinder?

Accepted Answer

A)  Surface tension 
B)  Adhesion 
C)  Polarity 
D)  Capillary action 
E)  Cohesion 
A)  Surface tension 
B)  Adhesion 
C)  Polarity 
D)  Capillary action 
E)  Cohesion

Question 8

Which of the following pure substances would be expected to have the highest boiling point?

Accepted Answer

A)  CH4 
B)  Cl2 
C)  Kr 
D)  CH3Cl 
E)  N2 
A)  CH4 
B)  Cl2 
C)  Kr 
D)  CH3Cl 
E)  N2

Question 9

The strongest intermolecular interactions between ethyl alcohol (CH3CH2OH) molecules arise from

Accepted Answer

A)  dipole-dipole forces. 
B)  London dispersion forces. 
C)  hydrogen bonding. 
D)  ion-dipole interactions. 
E)  carbon-oxygen bonds. 
A)  dipole-dipole forces. 
B)  London dispersion forces. 
C)  hydrogen bonding. 
D)  ion-dipole interactions. 
E)  carbon-oxygen bonds.

Question 10

What types of intermolecular forces exist between hydrogen fluoride molecules?

Accepted Answer

A)  II and III 
B)  I, II, and III 
C)  I only 
D)  III only 
E)  I and III 
A)  II and III 
B)  I, II, and III 
C)  I only 
D)  III only 
E)  I and III

Question 11

Which liquid is expected to have the larger surface tension at a given temperature, CCl4 or H2O? Briefly explain.

Accepted Answer

Water would have the

Question 12

What is the intermolecular force that exists between a calcium ion and water?

Accepted Answer

A)  dipole-dipole forces 
B)  London dispersion forces 
C)  ion-dipole forces 
D)  covalent bonding 
E)  ion-ion forces 
A)  dipole-dipole forces 
B)  London dispersion forces 
C)  ion-dipole forces 
D)  covalent bonding 
E)  ion-ion forces

Question 13

Arrange the following in order of increasing boiling point: RbCl, CH3Cl, CH3OH, CH4.

Accepted Answer

A)  CH3OH 3Cl 4 
B)  CH3OH 4 3Cl 3 Cl 3 OH 4  
D)  CH4 3OH 3Cl 4 3Cl 3OH < RbCl 
A)  CH3OH 3Cl 4 
B)  CH3OH 4 3Cl 3 Cl 3 OH 4  
D)  CH4 3OH 3Cl 4 3Cl 3OH < RbCl

Question 14

Only molecules which do not have dipole moments can experience dispersion forces.

Accepted Answer

A) True 
 B)False

Question 15

What is the name given to the attractive forces that hold particles together in the condensed phase?

Accepted Answer

A)  ionic bonds 
B)  covalent bonds 
C)  intermolecular forces 
D)  electronegativity 
E)  electron attraction 
A)  ionic bonds 
B)  covalent bonds 
C)  intermolecular forces 
D)  electronegativity 
E)  electron attraction

Question 16

Ice is less dense than water due to the formation of hydrogen bonds.

Accepted Answer

A) True 
 B)False

Question 17

Below is a representation of the unit cell for nickel(II) oxide. How many O2- anions are there in the unit cell?

Accepted Answer

A)  1 
B)  4 
C)  8 
D)  13 
E)  14 
A)  1 
B)  4 
C)  8 
D)  13 
E)  14

Question 18

Octane is a component of fuel used in internal combustion engines. The dominant intermolecular forces in octane are

Accepted Answer

A)  dipole-dipole forces. 
B)  London dispersion forces. 
C)  hydrogen bonding. 
D)  covalent bonds. 
E)  carbon-hydrogen bonds. 
A)  dipole-dipole forces. 
B)  London dispersion forces. 
C)  hydrogen bonding. 
D)  covalent bonds. 
E)  carbon-hydrogen bonds.

Question 19

Lead crystallizes in the face-centered cubic lattice. What is the coordination number for Pb?

Accepted Answer

A)  4 
B)  6 
C)  8 
D)  10 
E)  12 
A)  4 
B)  6 
C)  8 
D)  10 
E)  12

Question 20

Which corresponds to the temperature-dependent partial pressure above the surface of a liquid?

Accepted Answer

A)  Surface tension 
B)  Vapor pressure 
C)  Boiling point 
D)  Viscosity 
E)  Capillary action 
A)  Surface tension 
B)  Vapor pressure 
C)  Boiling point 
D)  Viscosity 
E)  Capillary action

Exam 11: Intermolecular Forces and the Physical Properties of Liquids and Solids

The strongest intermolecular interactions between pentane (C5H12) molecules arise from

Liquid ammonia can be used as a refrigerant and heat transfer fluid. How much energy is required to heat 25.0 g of NH3(l) from -65.0°C to -12.0°C?

Solids are generally most stable in crystalline form.

Consider the phase diagram shown below. a. What phase(s) is/are present at point A? b. What phase(s) is/are present at point B? c. Name point C and explain its significance. d. Starting at D, if the pressure is lowered while the temperature remains constant, describe what will happen.

Which one of the following pure substances will exhibit hydrogen bonding?

Which substance has the lowest vapor pressure at room temperature?

What name is given to the phenomenon where a thin film of water contracts and adheres to the wall of a glass cylinder?

Which of the following pure substances would be expected to have the highest boiling point?

The strongest intermolecular interactions between ethyl alcohol (CH3CH2OH) molecules arise from

What types of intermolecular forces exist between hydrogen fluoride molecules?

Which liquid is expected to have the larger surface tension at a given temperature, CCl4 or H2O? Briefly explain.

What is the intermolecular force that exists between a calcium ion and water?

Arrange the following in order of increasing boiling point: RbCl, CH3Cl, CH3OH, CH4.

Only molecules which do not have dipole moments can experience dispersion forces.

What is the name given to the attractive forces that hold particles together in the condensed phase?

Ice is less dense than water due to the formation of hydrogen bonds.

Below is a representation of the unit cell for nickel(II) oxide. How many O2- anions are there in the unit cell?

Octane is a component of fuel used in internal combustion engines. The dominant intermolecular forces in octane are

Lead crystallizes in the face-centered cubic lattice. What is the coordination number for Pb?

Which corresponds to the temperature-dependent partial pressure above the surface of a liquid?

Chemistry: the Central Science

Atoms, Molecules, and Ions

Stoichiometry: Ratios of Combination

Reactions in Aqueous Solutions

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Electron Configuration and the Periodic Table

Chemical Bonding I: Basic Concepts

Chemical Bonding II: Molecular Geometry and Bonding Theories

Gases

Modern Materials

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Entropy, Free Energy, and Equilibrium

Electrochemistry

Nuclear Chemistry

Environmental Chemistry

Coordination Chemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Organic Chemistry

Filters

The strongest intermolecular interactions between pentane (C₅H₁₂) molecules arise from

Liquid ammonia can be used as a refrigerant and heat transfer fluid. How much energy is required to heat 25.0 g of NH₃(l) from -65.0°C to -12.0°C?

The strongest intermolecular interactions between ethyl alcohol (CH₃CH₂OH) molecules arise from

Which liquid is expected to have the larger surface tension at a given temperature, CCl₄ or H₂O? Briefly explain.

Arrange the following in order of increasing boiling point: RbCl, CH₃Cl, CH₃OH, CH₄.

Below is a representation of the unit cell for nickel(II) oxide. How many O^2- anions are there in the unit cell?