Question 1

Under ordinary conditions,a substance will sublime rather than melt if its triple point occurs at a pressure above atmospheric pressure.

Accepted Answer

A) True 
 B)False

Question 2

When the phase diagram for a substance has a solid-liquid phase boundary line that has a ________ slope,the substance can go from solid to liquid,within a small temperature range,via the application of pressure.

Accepted Answer

A) positive 
B) zero 
C) y = 1 
D) negative 
E) y = 0 
A) positive 
B) zero 
C) y = 1 
D) negative 
E) y = 0

Question 3

The critical temperature and pressure of CS2 are 279 °C and 78 atm,respectively.A supercritical fluid can only exist at a temperature ________ 279 °C and pressure ________ 78 atm.

Accepted Answer

A) exactly, exactly 
B) above, below 
C) above, above 
D) below, above 
E) below, below 
A) exactly, exactly 
B) above, below 
C) above, above 
D) below, above 
E) below, below

Question 4

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 5

Of the following,________ is the most volatile.

Accepted Answer

A) C2H6 
B) C2I6 
C) C2Br6 
D) C2Cl6 
E) C2F6 
A) C2H6 
B) C2I6 
C) C2Br6 
D) C2Cl6 
E) C2F6

Question 6

The phase diagram of a substance is shown above.The area labeled ________ indicates the gas 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 7

Volatility and vapor pressure are ________.

Accepted Answer

A) inversely proportional to one another 
B) directly proportional to one another 
C) not related 
D) the same thing 
E) both independent of temperature 
A) inversely proportional to one another 
B) directly proportional to one another 
C) not related 
D) the same thing 
E) both independent of temperature

Question 8

For a given substance that exhibits liquid-crystalline properties,the transition from solid to liquid-crystal state occurs ________.

Accepted Answer

A) over a range of temperatures between the melting point of the solid and the boiling point of the liquid 
B) at the melting point of the solid 
C) over a range of temperatures that includes the melting point of the solid 
D) at a well-defined temperature above the melting point of the solid 
E) at a well-defined temperature below the melting point of the solid 
A) over a range of temperatures between the melting point of the solid and the boiling point of the liquid 
B) at the melting point of the solid 
C) over a range of temperatures that includes the melting point of the solid 
D) at a well-defined temperature above the melting point of the solid 
E) at a well-defined temperature below the melting point of the solid

Question 9

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

Accepted Answer

A) KBr 
B) HI 
C) CH3OH 
D) CH3CH3 
E) CH3F 
A) KBr 
B) HI 
C) CH3OH 
D) CH3CH3 
E) CH3F

Question 10

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 11

On the phase diagram shown above,the coordinates of point B corresponds to the ________.

Accepted Answer

A) critical temperature and pressure 
B) critical pressure 
C) critical temperature 
D) boiling point 
E) triple point 
A) critical temperature and pressure 
B) critical pressure 
C) critical temperature 
D) boiling point 
E) triple point

Question 12

The vapor pressure of a liquid ________.

Accepted Answer

A) increases linearly with increasing temperature 
B) increases nonlinearly with increasing temperature 
C) decreases linearly with increasing temperature 
D) decreases nonlinearly with increasing temperature 
E) is totally unrelated to its molecular structure 
A) increases linearly with increasing temperature 
B) increases nonlinearly with increasing temperature 
C) decreases linearly with increasing temperature 
D) decreases nonlinearly with increasing temperature 
E) is totally unrelated to its molecular structure

Question 13

Which one of the following substances will have hydrogen bonding as one of its intermolecular forces?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 14

Ethanol (     OH)melts at -114 °C.The enthalpy of fusion is 5.02 kJ/mol.The specific heats of solid and liquid ethanol are 0.97 J/g-K and 2.3 J/g-K,respectively.How much heat (kJ)is needed to convert 25.0 g of solid ethanol at -135 °C to liquid ethanol at -60 °C?

Accepted Answer

A) 207.3 
B) -13.3 
C) 6.34 
D) 3617 
E) 8.63 
A) 207.3 
B) -13.3 
C) 6.34 
D) 3617 
E) 8.63

Question 15

Which of the following statements is false?

Accepted Answer

A) The absolute value of the heat of sublimation is equal to the absolute value of the heat of deposition. 
B) The heat of sublimation is equal to the sum of the heat of vaporization and the heat of deposition. 
C) The heat of sublimation is equal to the sum of the heat of vaporization and the heat of freezing. 
D) The absolute value of the heat of sublimation is equal to the absolute value of the sum of the heat of condensation and the heat of freezing. 
E) The absolute value of the heat of deposition is equal to sum of the absolute value of the heat of vaporization and the absolute value of the heat of freezing. 
A) The absolute value of the heat of sublimation is equal to the absolute value of the heat of deposition. 
B) The heat of sublimation is equal to the sum of the heat of vaporization and the heat of deposition. 
C) The heat of sublimation is equal to the sum of the heat of vaporization and the heat of freezing. 
D) The absolute value of the heat of sublimation is equal to the absolute value of the sum of the heat of condensation and the heat of freezing. 
E) The absolute value of the heat of deposition is equal to sum of the absolute value of the heat of vaporization and the absolute value of the heat of freezing.

Question 16

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

Accepted Answer

A) less separated, more 
B) less separated, less 
C) more separated, more 
D) more separated, less 
E) smaller, lesser 
A) less separated, more 
B) less separated, less 
C) more separated, more 
D) more separated, less 
E) smaller, lesser

Question 17

Heats of vaporization are greater than heats of fusion.

Accepted Answer

A) True 
 B)False

Question 18

The predominant intramolecular force in CaBr2 is ________.

Accepted Answer

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

Question 19

Based on molecular mass and dipole moment of the five compounds in the table below,which should have the highest boiling point?

Accepted Answer

A) CH3CH2CH3 
B) CH3OCH3 
C) CH3Cl 
D) CH3CHO 
E) CH3CN 
A) CH3CH2CH3 
B) CH3OCH3 
C) CH3Cl 
D) CH3CHO 
E) CH3CN

Question 20

In general,the vapor pressure of a substance increases as ________ increases.

Accepted Answer

A) surface tension 
B) molecular weight 
C) hydrogen bonding 
D) viscosity 
E) temperature 
A) surface tension 
B) molecular weight 
C) hydrogen bonding 
D) viscosity 
E) temperature

Exam 11: Liquids and Intermolecular Forces

Under ordinary conditions,a substance will sublime rather than melt if its triple point occurs at a pressure above atmospheric pressure.

When the phase diagram for a substance has a solid-liquid phase boundary line that has a ________ slope,the substance can go from solid to liquid,within a small temperature range,via the application of pressure.

The critical temperature and pressure of CS2 are 279 °C and 78 atm,respectively.A supercritical fluid can only exist at a temperature ________ 279 °C and pressure ________ 78 atm.

Large intermolecular forces in a substance are manifested by ________.

Of the following,________ is the most volatile.

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

Volatility and vapor pressure are ________.

For a given substance that exhibits liquid-crystalline properties,the transition from solid to liquid-crystal state occurs ________.

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

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?

On the phase diagram shown above,the coordinates of point B corresponds to the ________.

The vapor pressure of a liquid ________.

Which one of the following substances will have hydrogen bonding as one of its intermolecular forces?

Ethanol ( OH)melts at -114 °C.The enthalpy of fusion is 5.02 kJ/mol.The specific heats of solid and liquid ethanol are 0.97 J/g-K and 2.3 J/g-K,respectively.How much heat (kJ)is needed to convert 25.0 g of solid ethanol at -135 °C to liquid ethanol at -60 °C?

Which of the following statements is false?

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

Heats of vaporization are greater than heats of fusion.

The predominant intramolecular force in CaBr2 is ________.

Based on molecular mass and dipole moment of the five compounds in the table below,which should have the highest boiling point?

In general,the vapor pressure of a substance increases as ________ increases.

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

The critical temperature and pressure of CS₂ are 279 °C and 78 atm,respectively.A supercritical fluid can only exist at a temperature 279 °C and pressure 78 atm.

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

The predominant intramolecular force in CaBr₂ is ________.