Question 1

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 ΔHfusion of this substance.

Accepted Answer

A)  AB
B)  BC
C)  CD
D)  DE
E)  EFF) B) and C)
G) A) and E)

Question 2

For a given substance that exhibits liquid-crystalline properties, the liquid-crystalline state exists __________.

Accepted Answer

A)  at one particular temperature below the melting point of the solid
B)  in a range of temperatures below the melting point of the solid
C)  at one particular temperature above the melting point of the solid
D)  in a range of temperatures above the melting point of the solid
E)  in a range of temperatures from below the melting point to above the melting pointF) None of the above
G) B) and E)

Question 3

The heating curve shown was generated by measuring the heat flow and temperature for a solid as it was heated. The slope of the __________ segment corresponds to the heat capacity of the liquid of the substance.

Accepted Answer

A)  AB
B)  BC
C)  CD
D)  DE
E)  EFF) B) and C)
G) C) and D)

Question 4

Which statements about viscosity are true? (i) Viscosity increases as temperature decreases.
(ii) Viscosity increases as molecular weight increases.
(iii) Viscosity increases as intermolecular forces increase.

Accepted Answer

A)  (i) only
B)  (ii) and (iii) 
C)  (i) and (iii) 
D)  none
E)  allF) B) and D)
G) None of the above

Question 5

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

Accepted Answer

A)  CH3OH
B)  H2S
C)  NH3
D)  HCl
E)  CH4F) A) and E)
G) None of the above

Question 6

Which one of the following substances will not have hydrogen bonding as one of its intermolecular forces?

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) A) and B)
G) None of the above

Question 7

Based on the figure above, the boiling point of water under an external pressure of 0.493 atm is __________°C.

Accepted Answer

A)  80
B)  40
C)  60
D)  70
E)  90F) C) and D)
G) A) and B)

Question 8

On the phase diagram shown above, segment __________ corresponds to the conditions of temperature and pressure under which the solid and the gas of the substance are in equilibrium.

Accepted Answer

A)  AB
B)  AC
C)  AD
D)  CD
E)  BCF) A) and E)
G) B) and E)

Question 9

In the __________ liquid crystalline phase, the component molecules exhibit only one dimensional ordering.

Accepted Answer

A)  nematic
B)  smectic A
C)  smectic B
D)  smectic C
E)  cholestericF) B) and E)
G) B) and D)

Question 10

Viscosity is __________.

Accepted Answer

A)  the "skin" on a liquid surface caused by intermolecular attraction
B)  the resistance to flow
C)  the same as density
D)  inversely proportional to molar mass
E)  unaffected by temperatureF) A) and B)
G) B) and D)

Question 11

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

Accepted Answer

A)  AB
B)  BC
C)  CD
D)  DE
E)  EFF) A) and E)
G) A) and D)

Question 12

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)  EFF) A) and E)
G) C) and E)

Question 13

What is the predominant intermolecular force in CBr4?

Accepted Answer

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

Question 14

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

Accepted Answer

A)  AB
B)  BC
C)  CD
D)  DE
E)  EFF) A) and E)
G) C) and E)

Question 15

Ethanol (C2H5OH) 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 -50°C?

Accepted Answer

A)  207.3
B)  -12.7
C)  6.91
D)  4192
E)  9.21F) A) and B)
G) A) and C)

Question 16

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

Accepted Answer

A)  H2O
B)  CO2
C)  CH4
D)  Kr
E)  NH3F) A) and B)
G) A) and E)

Question 17

The intermolecular force(s) responsible for the fact that CH4 has the lowest boiling point in the set CH4, SiH4, GeH4, SnH4 is/are __________.

Accepted Answer

A)  hydrogen bonding
B)  dipole-dipole interactions
C)  London dispersion forces
D)  mainly hydrogen bonding but also dipole-dipole interactions
E)  mainly London-dispersion forces but also dipole-dipole interactionsF) A) and E)
G) All of the above

Question 18

Together, liquids and solids constitute __________ phases of matter.

Accepted Answer

A)  the compressible
B)  the fluid
C)  the condensed
D)  all of the
E)  the disorderedF) B) and E)
G) A) and B)

Question 19

Which type of liquid crystal is colored and changes color with temperature?

Accepted Answer

A)  nematic
B)  smectic A
C)  cholesteric
D)  smectic B
E)  smectic CF) B) and E)
G) C) and E)

Question 20

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

Accepted Answer

A)  XeF4
B)  AsH3
C)  CO2
D)  BCl3
E)  Cl2F) C) and D)
G) A) and E)

Exam 11: Liquids and Intermolecular Forces

Which type of liquid crystal is colored and changes color with temperature?

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On the phase diagram shown above, segment __________ corresponds to the conditions of temperature and pressure under which the solid and the gas of the substance are in equilibrium.

Correct AnswerverifiedShow Answer

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 ΔHfusion of this substance.

Correct AnswerverifiedShow Answer

Which one of the following substances will not have hydrogen bonding as one of its intermolecular forces?

Correct AnswerverifiedShow Answer

Which statements about viscosity are true? (i) Viscosity increases as temperature decreases. (ii) Viscosity increases as molecular weight increases. (iii) Viscosity increases as intermolecular forces increase.

Correct AnswerverifiedShow Answer

The intermolecular force(s) responsible for the fact that CH4 has the lowest boiling point in the set CH4, SiH4, GeH4, SnH4 is/are __________.

Correct AnswerverifiedShow Answer

Viscosity is __________.

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

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Based on the figure above, the boiling point of water under an external pressure of 0.493 atm is __________°C.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In the __________ liquid crystalline phase, the component molecules exhibit only one dimensional ordering.

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Ethanol (C2H5OH) 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 -50°C?

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

For a given substance that exhibits liquid-crystalline properties, the liquid-crystalline state exists __________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Together, liquids and solids constitute __________ phases of matter.

Correct AnswerverifiedShow Answer

What is the predominant intermolecular force in CBr4?

Correct AnswerverifiedShow Answer

The heating curve shown was generated by measuring the heat flow and temperature for a solid as it was heated. The slope of the __________ segment corresponds to the heat capacity of the liquid of the substance.

Correct AnswerverifiedShow Answer

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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_fusion of this substance.

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The intermolecular force(s) responsible for the fact that CH₄ has the lowest boiling point in the set CH₄, SiH₄, GeH₄, SnH₄ is/are __________.

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Ethanol (C₂H₅OH) 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 -50°C?

Correct Answer
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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.

Correct Answer
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What is the predominant intermolecular force in CBr₄?

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