Question 1

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 solidF) A) and E)
G) D) and E)

Question 2

Heats of vaporization are greater than heats of fusion.

Accepted Answer

A) True 
 B)False

Question 3

Which one of the following derivatives of ethane has the highest boiling point?

Accepted Answer

A)  C2Br6
B)  C2F6
C)  C2I6
D)  C2Cl6
E)  C2H6F) A) and B)
G) B) and E)

Question 4

Which statement is true about liquids but not true about solids?

Accepted Answer

A)  They flow and are highly ordered.
B)  They are highly ordered and not compressible.
C)  They flow and are compressible.
D)  They assume both the volume and the shape of their containers.
E)  They flow and are not compressible.F) A) and D)
G) All of the above

Question 5

Of the following, __________ has the highest boiling point.

Accepted Answer

A)  N2
B)  Br2
C)  H2
D)  Cl2
E)  O2F) A) and B)
G) All of the above

Question 6

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

Accepted Answer

A)  CH3OH
B)  NH3
C)  H2S
D)  CH4
E)  HClF) D) and E)
G) B) and D)

Question 7

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 temperaturesF) All of the above
G) C) and E)

Question 8

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

Accepted Answer

A)  H2O
B)  CCl4
C)  HF
D)  CH3COOH
E)  PH3F) D) and E)
G) A) and B)

Question 9

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 fluidF) A) and D)
G) C) and E)

Question 10

Based on the following information, which compound has the strongest intermolecular forces? Substance ΔHvap(kJ/mol) 
Argon (Ar) 6.3
Benzene (C6H6) 31.0
Ethanol (C2H5OH) 39.3
Water (H2O) 40.8
Methane (CH4) 9.2

Accepted Answer

A)  Argon
B)  Benzene
C)  Ethanol
D)  Water
E)  MethaneF) A) and B)
G) A) and C)

Question 11

The normal melting point of the substance with the phase diagram shown above is __________°C.

Accepted Answer

A)  15
B)  25
C)  35
D)  45
E)  55F) A) and D)
G) A) and C)

Question 12

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

Accepted Answer

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

Question 13

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

Accepted Answer

A)  PH3
B)  CCl4
C)  Br2
D)  CO2
E)  C10H22F) All of the above
G) A) and E)

Question 14

Which of the following is most likely to exhibit liquid-crystalline behavior?

Accepted Answer

A)  CH3CH2-C(CH3) 2-CH2CH3
B)  CH3CH2CH2CH2CH2CH2CH2CH3
C)  CH3CH2CH2CH2CH2-Na+
D)   3CH2-C(CH3) 2-CH2CH3 
B)  CH3CH2CH2CH2CH2CH2CH2CH3 
C)  CH3CH2CH2CH2CH2-Na+ 
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
E)   3CH2-C(CH3) 2-CH2CH3 
B)  CH3CH2CH2CH2CH2CH2CH2CH3 
C)  CH3CH2CH2CH2CH2-Na+ 
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >F) B) and D)
G) B) and C)

Question 15

In which of the following molecules is hydrogen bonding likely to be the most significant component of the total intermolecular forces?

Accepted Answer

A)  CH4
B)  C5H11OH
C)  C6H13NH2
D)  CH3OH
E)  CO2F) A) and B)
G) A) and D)

Question 16

The boiling points of normal hydrocarbons are higher than those of branched hydrocarbons of similar molecular weight because the London-dispersion forces between normal hydrocarbons are greater than those between branched hydrocarbons.

Accepted Answer

A) True 
 B)False

Question 17

Which of the following molecules has hydrogen bonding as its only intermolecular force?

Accepted Answer

A)  NH3
B)  H2O
C)  C3H7OH
D)  HOCH2CH2OH
E)  None, all of the above exhibit dispersion forces.F) B) and E)
G) All of the above

Question 18

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 rejections
C)  ionic-dipole interactions
D)  covalent-ionic interactions
E)  dipole-dipole attractionsF) A) and B)
G) B) and C)

Question 19

London Dispersion Forces tend to __________ in strength with increasing molecular weight.

Accepted Answer

The answer of London Dispersion Forces tend to __________ in...

Question 20

On a phase diagram, the melting point is the same as __________.

Accepted Answer

A)  the triple point
B)  the critical point
C)  the freezing point
D)  the boiling point
E)  the vapor-pressure curveF) C) and E)
G) B) and D)

Exam 11: Liquids and Intermolecular Forces

London Dispersion Forces tend to __________ in strength with increasing molecular weight.

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Crystalline solids __________.

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Which statement is true about liquids but not true about solids?

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The normal melting point of the substance with the phase diagram shown above is __________°C.

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

Correct AnswerverifiedShow Answer

In which of the following molecules is hydrogen bonding likely to be the most significant component of the total intermolecular forces?

Correct AnswerverifiedShow Answer

Based on the following information, which compound has the strongest intermolecular forces? Substance ΔHvap(kJ/mol) Argon (Ar) 6.3 Benzene (C6H6) 31.0 Ethanol (C2H5OH) 39.3 Water (H2O) 40.8 Methane (CH4) 9.2

Correct AnswerverifiedShow Answer

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 __________.

Correct AnswerverifiedShow Answer

The boiling points of normal hydrocarbons are higher than those of branched hydrocarbons of similar molecular weight because the London-dispersion forces between normal hydrocarbons are greater than those between branched hydrocarbons.

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

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

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Which one of the following derivatives of ethane has the highest boiling point?

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Which of the following is most likely to exhibit liquid-crystalline behavior?

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

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On a phase diagram, the melting point is the same as __________.

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

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Which of the following molecules has hydrogen bonding as its only intermolecular force?

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

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Of the following, __________ has the highest boiling point.

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Heats of vaporization are greater than heats of fusion.

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

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Based on the following information, which compound has the strongest intermolecular forces? Substance ΔH_vap(kJ/mol) Argon (Ar) 6.3 Benzene (C₆H₆) 31.0 Ethanol (C₂H₅OH) 39.3 Water (H₂O) 40.8 Methane (CH₄) 9.2

Correct Answer
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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 __________.

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