Question 1

-According to the phase diagram shown above, the normal melting point of this substance is ________ °C.

Accepted Answer

A) -13 
B) 10 
C) 29 
D) 38 
E) 0 
A) -13 
B) 10 
C) 29 
D) 38 
E) 0

Question 2

-Based on the figure above, the boiling point of diethyl ether under an external pressure of 0.605 atm is ________ °C.

Accepted Answer

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

Question 3

Molecules with only single bonds do not generally exhibit liquid-crystalline properties because ________.

Accepted Answer

A) molecules without multiple bonds lack the rigidity necessary for alignment 
B) molecules without multiple bonds are too small to exhibit liquid-crystalline properties 
C) molecules with only single bonds are gases 
D) molecules with only single bonds are too big to exhibit liquid-crystalline properties 
E) molecules without multiple bonds lack the flexibility necessary for alignment 
A) molecules without multiple bonds lack the rigidity necessary for alignment 
B) molecules without multiple bonds are too small to exhibit liquid-crystalline properties 
C) molecules with only single bonds are gases 
D) molecules with only single bonds are too big to exhibit liquid-crystalline properties 
E) molecules without multiple bonds lack the flexibility necessary for alignment

Question 4

Which one of the following should have the lowest boiling point?

Accepted Answer

A) CH4 
B) PCl3 
C) C2H5COOH 
D) LiCl 
E) Cl2S 
A) CH4 
B) PCl3 
C) C2H5COOH 
D) LiCl 
E) Cl2S

Question 5

The critical temperature and pressure of CS2 are 279 °C and 78 atm, respectively. At temperatures above 279 °C and pressures above 78 atm, CS2 can only occur as a ________.

Accepted Answer

A) solid 
B) liquid 
C) liquid and gas 
D) gas 
E) supercritical fluid 
A) solid 
B) liquid 
C) liquid and gas 
D) gas 
E) supercritical fluid

Question 6

The direct conversion of a solid to a gas is called ________.

Accepted Answer

The answer of The direct conversion of a solid to...

Question 7

-The phase diagram of a substance is shown above. The area labeled ________ indicates the solid phase for the substance.

Accepted Answer

A) w 
B) x 
C) y 
D) z 
E) y and z 
A) w 
B) x 
C) y 
D) z 
E) y and z

Question 8

With what compound will NH3 experience only dispersion intermolecular forces?

Accepted Answer

A) BF3 
B) LiF 
C) CH3I 
D) CH3OH 
E) HCN 
A) BF3 
B) LiF 
C) CH3I 
D) CH3OH 
E) HCN

Question 9

Heat of sublimation can be approximated by adding together ________ and ________.

Accepted Answer

A) heat of fusion, heat of condensation 
B) heat of fusion, heat of vaporization 
C) heat of freezing (solidification), heat of condensation 
D) heat of freezing (solidification), heat of vaporization 
E) heat of deposition, heat of vaporization 
A) heat of fusion, heat of condensation 
B) heat of fusion, heat of vaporization 
C) heat of freezing (solidification), heat of condensation 
D) heat of freezing (solidification), heat of vaporization 
E) heat of deposition, heat of vaporization

Question 10

Of the following substances, ________ has the highest boiling point.

Accepted Answer

A) H2O 
B) SiH4 
C) Ar 
D) Cl2 
E) BF3 
A) H2O 
B) SiH4 
C) Ar 
D) Cl2 
E) BF3

Question 11

On a phase diagram, the critical temperature is ________.

Accepted Answer

A) the temperature below which a gas cannot be liquefied 
B) the temperature above which a gas cannot be liquefied 
C) the temperature at which all three states are in equilibrium 
D) the temperature required to melt a solid 
E) the temperature required to cause sublimation of a solid 
A) the temperature below which a gas cannot be liquefied 
B) the temperature above which a gas cannot be liquefied 
C) the temperature at which all three states are in equilibrium 
D) the temperature required to melt a solid 
E) the temperature required to cause sublimation of a solid

Question 12

Ethanol melts at -114 °C and boils at 78 °C at a constant pressure of 1 atm. What state of matter must a sample of ethanol be in at 0°C and 1 atm?

Accepted Answer

A) liquid 
B) gas 
C) solid 
D) solid and liquid in equilibrium 
E) liquid and gas in equilibrium 
A) liquid 
B) gas 
C) solid 
D) solid and liquid in equilibrium 
E) liquid and gas in equilibrium

Question 13

Crystalline solids ________.

Accepted Answer

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

Question 14

Large intermolecular forces in a substance are manifested by ________.

Accepted Answer

A) low vapor pressure 
B) high boiling point 
C) high heats of fusion and vaporization 
D) high critical temperatures and pressures 
E) all of the above 
A) low vapor pressure 
B) high boiling point 
C) high heats of fusion and vaporization 
D) high critical temperatures and pressures 
E) all of the above

Question 15

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 16

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

Accepted Answer

A) AsH3 
B) CBr4 
C) SiO2 
D) Cl2 
E) BH3 
A) AsH3 
B) CBr4 
C) SiO2 
D) Cl2 
E) BH3

Question 17

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

Accepted Answer

A) SiBr4 
B) PF3 
C) C4H9COOH 
D) HCl 
E) Cl2O 
A) SiBr4 
B) PF3 
C) C4H9COOH 
D) HCl 
E) Cl2O

Question 18

-The phase diagram of a substance is shown above. The area labeled ________ indicates the liquid phase for the substance.

Accepted Answer

A) w 
B) x 
C) y 
D) z 
E) y and z 
A) w 
B) x 
C) y 
D) z 
E) y and z

Question 19

-The heating curve shown was generated by measuring the heat flow and temperature of a solid as it was heated. The heat flow into the sample in the segment ________ will yield the value of the ΔHvap of this substance.

Accepted Answer

A) AB 
B) BC 
C) CD 
D) DE 
E) EF 
A) AB 
B) BC 
C) CD 
D) DE 
E) EF

Question 20

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

Accepted Answer

A) CH3OH 
B) NH3 
C) H2S 
D) Kr 
E) HCl 
A) CH3OH 
B) NH3 
C) H2S 
D) Kr 
E) HCl

Exam 11: Liquids and Intermolecular Forces

-According to the phase diagram shown above, the normal melting point of this substance is ________ °C.

-Based on the figure above, the boiling point of diethyl ether under an external pressure of 0.605 atm is ________ °C.

Molecules with only single bonds do not generally exhibit liquid-crystalline properties because ________.

Which one of the following should have the lowest boiling point?

The critical temperature and pressure of CS2 are 279 °C and 78 atm, respectively. At temperatures above 279 °C and pressures above 78 atm, CS2 can only occur as a ________.

The direct conversion of a solid to a gas is called ________.

-The phase diagram of a substance is shown above. The area labeled ________ indicates the solid phase for the substance.

With what compound will NH3 experience only dispersion intermolecular forces?

Heat of sublimation can be approximated by adding together ________ and ________.

Of the following substances, ________ has the highest boiling point.

On a phase diagram, the critical temperature is ________.

Ethanol melts at -114 °C and boils at 78 °C at a constant pressure of 1 atm. What state of matter must a sample of ethanol be in at 0°C and 1 atm?

Crystalline solids ________.

Large intermolecular forces in a substance are manifested by ________.

Of the following, ________ is an exothermic process.

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

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

-The phase diagram of a substance is shown above. The area labeled ________ indicates the liquid phase for the substance.

-The heating curve shown was generated by measuring the heat flow and temperature of a solid as it was heated. The heat flow into the sample in the segment ________ will yield the value of the ΔHvap of this substance.

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

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Stoichiometry: Calculations With Chemical Formulas and Equations

Aqueous Reactions and Solution Stoichiometry

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

The critical temperature and pressure of CS₂ are 279 °C and 78 atm, respectively. At temperatures above 279 °C and pressures above 78 atm, CS₂ can only occur as a ________.

With what compound will NH₃ experience only dispersion intermolecular forces?

Heat of sublimation can be approximated by adding together and .

-The heating curve shown was generated by measuring the heat flow and temperature of a solid as it was heated. The heat flow into the sample in the segment ________ will yield the value of the ΔH_vap of this substance.