Question 1

________ liquid crystals are colored because the molecular layers are arranged in slightly twisted planes with respect to one another.

Accepted Answer

A) smectic B 
B) cholesteric 
C) smectic A 
D) smectic C 
E) smectic D 
A) smectic B 
B) cholesteric 
C) smectic A 
D) smectic C 
E) smectic D

Question 2

What types of intermolecular forces exist between water and HF?

Accepted Answer

A) dispersion forces and dipole-dipole forces 
B) dispersion forces, dipole-dipole forces, and hydrogen bonds 
C) dispersion forces and hydrogen bonds 
D) dispersion forces 
E) dispersion forces, hydrogen bonds, and ion-dipole forces 
A) dispersion forces and dipole-dipole forces 
B) dispersion forces, dipole-dipole forces, and hydrogen bonds 
C) dispersion forces and hydrogen bonds 
D) dispersion forces 
E) dispersion forces, hydrogen bonds, and ion-dipole forces

Question 3

Of the following,________ is an exothermic process.

Accepted Answer

A) melting 
B) subliming 
C) freezing 
D) boiling 
E) All of the above are exothermic. 
A) melting 
B) subliming 
C) freezing 
D) boiling 
E) All of the above are exothermic.

Question 4

As a gaseous element condenses,the atoms become ________ and they have ________ attraction for one another.

Accepted Answer

A) more separated, more 
B) more separated, less 
C) closer together, more 
D) closer together, less 
E) larger, greater 
A) more separated, more 
B) more separated, less 
C) closer together, more 
D) closer together, less 
E) larger, greater

Question 5

Molecules containing many double bonds do not exhibit liquid-crystal behavior because free rotation can occur only around single bonds making these molecules rigid.

Accepted Answer

A) True 
 B)False

Question 6

What is the predominant intermolecular force in H2NNH2?

Accepted Answer

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

Question 7

Elemental iodine (I2)is a solid at room temperature.What is the major attractive force that exists among different I2 molecules in the solid?

Accepted Answer

A) London dispersion forces 
B) dipole-dipole interactions 
C) ionic-dipole interactions 
D) covalent-ionic interactions 
E) dipole-dipole attractions 
A) London dispersion forces 
B) dipole-dipole interactions 
C) ionic-dipole interactions 
D) covalent-ionic interactions 
E) dipole-dipole attractions

Question 8

Of the following substances,only ________ has London dispersion forces as its only intermolecular force.

Accepted Answer

A) CCl4 
B) SnF3 
C) CH3OH 
D) HI 
E) H2O 
A) CCl4 
B) SnF3 
C) CH3OH 
D) HI 
E) H2O

Question 9

The ease with which the charge distribution in a molecule can be distorted by an external electrical field is called the ________.

Accepted Answer

A) electronegativity 
B) hydrogen bonding 
C) polarizability 
D) volatility 
E) viscosity 
A) electronegativity 
B) hydrogen bonding 
C) polarizability 
D) volatility 
E) viscosity

Question 10

Which one of the following exhibits dipole-dipole attraction between molecules?

Accepted Answer

A) HCl 
B) CF4 
C) CS2 
D) F2 
E) BI3 
A) HCl 
B) CF4 
C) CS2 
D) F2 
E) BI3

Question 11

According to the phase diagram shown above,what is the normal melting point (°C)?

Accepted Answer

A) 15 
B) 25 
C) 35 
D) 45 
E) 55 
A) 15 
B) 25 
C) 35 
D) 45 
E) 55

Question 12

Which species has London dispersion forces as the only intermolecular force?

Accepted Answer

A) CH3CH2OH 
B) Ar 
C) NH3 
D) HBr 
E) H2O 
A) CH3CH2OH 
B) Ar 
C) NH3 
D) HBr 
E) H2O

Question 13

Based on the figure above,the boiling point of ethyl alcohol under an external pressure of   is

Accepted Answer

A) 20 
B) 40 
C) 60 
D) 80 
E) 70 
A) 20 
B) 40 
C) 60 
D) 80 
E) 70

Question 14

In liquids,the attractive intermolecular forces are ________.

Accepted Answer

A) very weak compared with kinetic energies of the molecules 
B) strong enough to hold molecules relatively close together 
C) strong enough to keep the molecules confined to vibrating about their fixed lattice points 
D) not strong enough to keep molecules from moving past each other 
E) strong enough to hold molecules relatively close together but not strong enough to keep molecules from moving past each other 
A) very weak compared with kinetic energies of the molecules 
B) strong enough to hold molecules relatively close together 
C) strong enough to keep the molecules confined to vibrating about their fixed lattice points 
D) not strong enough to keep molecules from moving past each other 
E) strong enough to hold molecules relatively close together but not strong enough to keep molecules from moving past each other

Question 15

A supercritical fluid can expand like a ________ to fill a container and has a density similar to that of a ________ so can behave as a solvent.

Accepted Answer

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

Question 16

Based on the figure above,what is the boiling point (°C)of water under an external pressure of   .

Accepted Answer

A) 40 
B) 60 
C) 70 
D) 90 
E) 80 
A) 40 
B) 60 
C) 70 
D) 90 
E) 80

Question 17

What is the predominant intermolecular force in CH4?

Accepted Answer

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

Question 18

The heating curve shown was generated by measuring the heat flow and temperature for a solid as it was heated.The slope of the E-F segment corresponds to the heat capacity of the ________.

Accepted Answer

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

Question 19

Crystalline solids ________.

Accepted Answer

A) have their particles arranged randomly 
B) have ordered structures 
C) are usually very soft 
D) exist only at high temperatures 
E) exist only at very low temperatures 
A) have their particles arranged randomly 
B) have ordered structures 
C) are usually very soft 
D) exist only at high temperatures 
E) exist only at very low temperatures

Question 20

When KBr dissolves in water,aqueous K+ and Br- ions result.The force of attraction that exists between K+ and H2O is called a(n)________ interaction.

Accepted Answer

A) dipole-dipole 
B) ion-dipole 
C) ion-ion 
D) London dispersion force 
E) hydrogen bonding 
A) dipole-dipole 
B) ion-dipole 
C) ion-ion 
D) London dispersion force 
E) hydrogen bonding

Exam 11: Liquids and Intermolecular Forces

________ liquid crystals are colored because the molecular layers are arranged in slightly twisted planes with respect to one another.

What types of intermolecular forces exist between water and HF?

Of the following,________ is an exothermic process.

As a gaseous element condenses,the atoms become ________ and they have ________ attraction for one another.

Molecules containing many double bonds do not exhibit liquid-crystal behavior because free rotation can occur only around single bonds making these molecules rigid.

What is the predominant intermolecular force in H2NNH2?

Elemental iodine (I2)is a solid at room temperature.What is the major attractive force that exists among different I2 molecules in the solid?

Of the following substances,only ________ has London dispersion forces as its only intermolecular force.

The ease with which the charge distribution in a molecule can be distorted by an external electrical field is called the ________.

Which one of the following exhibits dipole-dipole attraction between molecules?

According to the phase diagram shown above,what is the normal melting point (°C)?

Which species has London dispersion forces as the only intermolecular force?

Based on the figure above,the boiling point of ethyl alcohol under an external pressure of is

In liquids,the attractive intermolecular forces are ________.

A supercritical fluid can expand like a ________ to fill a container and has a density similar to that of a ________ so can behave as a solvent.

Based on the figure above,what is the boiling point (°C)of water under an external pressure of .

What is the predominant intermolecular force in CH4?

The heating curve shown was generated by measuring the heat flow and temperature for a solid as it was heated.The slope of the E-F segment corresponds to the heat capacity of the ________.

Crystalline solids ________.

When KBr dissolves in water,aqueous K+ and Br- ions result.The force of attraction that exists between K+ and H2O is called a(n)________ interaction.

Introduction: Matter, energy, and Measurement

Atoms, molecules, and Ions

Chemical Reactions and Reaction Stoichiometry

Reactions in Aqueous Solution

Thermochemistry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Molecular Geometry and Bonding Theories

Gases

Solids and Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Aqueous Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Transition Metals and Coordination Chemistry

The Chemistry of Life: Organic and Biological Chemistry

Filters

As a gaseous element condenses,the atoms become and they have attraction for one another.

What is the predominant intermolecular force in H₂NNH₂?

Elemental iodine (I₂)is a solid at room temperature.What is the major attractive force that exists among different I₂ molecules in the solid?

A supercritical fluid can expand like a to fill a container and has a density similar to that of a so can behave as a solvent.

What is the predominant intermolecular force in CH₄?

When KBr dissolves in water,aqueous K⁺ and Br^- ions result.The force of attraction that exists between K⁺ and H₂O is called a(n)________ interaction.