Question 1

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)  80F) C) and E)
G) A) and C)

Question 2

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, greaterF) C) and D)
G) None of the above

Question 3

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 bondingF) A) and C)
G) A) and B)

Question 4

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)  H2OF) C) and D)
G) A) and D)

Question 5

________ 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 DF) A) and D)
G) A) and E)

Question 6

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 attractionsF) C) and E)
G) None of the above

Question 7

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

Accepted Answer

A)  CH3CH2OH
B)  Ar
C)  NH3
D)  HBr
E)  H2OF) A) and E)
G) C) and D)

Question 8

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)  70F) C) and E)
G) B) and E)

Question 9

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)  55F) B) and C)
G) C) and D)

Question 10

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

Accepted Answer

A)  HCl
B)  CF4
C)  CS2
D)  F2
E)  BI3F) B) and D)
G) None of the above

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 E-F segment corresponds to the heat capacity of the ________.

Accepted Answer

A)  liquid-gas
B)  solid-gas
C)  gas
D)  solid
E)  liquidF) A) and B)
G) All of the above

Question 12

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, liquidF) C) and D)
G) A) and D)

Question 13

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 otherF) D) and E)
G) B) and E)

Question 14

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 15

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 forcesF) All of the above
G) B) and C)

Question 16

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)  viscosityF) None of the above
G) B) and C)

Question 17

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 forcesF) A) and B)
G) A) and C)

Question 18

Of the following,________ is an exothermic process.

Accepted Answer

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

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 temperaturesF) None of the above
G) C) and D)

Question 20

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 bondingF) A) and D)
G) B) and D)

Exam 11: Liquids and Intermolecular Forces

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

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What is the predominant intermolecular force in CH4?

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

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What is the predominant intermolecular force in H2NNH2?

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Crystalline solids ________.

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

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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.

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Of the following,________ is an exothermic process.

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

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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.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What types of intermolecular forces exist between water and HF?

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 E-F segment corresponds to the heat capacity of the ________.

Correct AnswerverifiedShow Answer

In liquids,the attractive intermolecular forces are ________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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What is the predominant intermolecular force in CH₄?

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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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What is the predominant intermolecular force in H₂NNH₂?

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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.

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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.

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

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