Question 1

The coordination number of sodium and chloride ions in the NaCl lattice, are, respectively:

Accepted Answer

A)   10 and 10
B)   8 and 8
C)   6 and 6
D)   4 and 4
E)   None of these choices is correct.F) A) and B)
G) C) and D)

Question 2

Draw a fully labeled phase diagram (P versus T) of a substance whose solid phase can melt due to applied pressure (i.e., solid is less dense than liquid). Clearly label the triple point and the critical temperature on your diagram.

Accepted Answer

The answer of Draw a fully labeled phase diagram (P...

Question 3

Which of the following liquid substances would you expect to have the lowest surface tension?

Accepted Answer

A)   Pb
B)   CH3OCH3
C)   HOCH2CH2OH
D)   H2O
E)   CH3CH2OHF) A) and E)
G) A) and D)

Question 4

Octane is a component of fuel used in internal combustion engines. The dominant intermolecular forces in octane are

Accepted Answer

A)   dipole-dipole forces.
B)   London dispersion forces.
C)   hydrogen bonding.
D)   covalent bonds.
E)   carbon-hydrogen bonds.F) None of the above
G) B) and E)

Question 5

The Clausius-Clapeyron equation is used in calculations of

Accepted Answer

A)   melting and freezing points.
B)   vapor pressures of liquids.
C)   osmotic pressures of solutions.
D)   heats of vaporization at different temperatures.
E)   crystal structure.F) B) and C)
G) B) and E)

Question 6

Which of the following should have the lowest boiling point?

Accepted Answer

A)   C5H12
B)   C6H14
C)   C8H18
D)   C10H22
E)   C12H26F) All of the above
G) B) and D)

Question 7

Which one of the following substances does not exist in the indicated solid type?

Accepted Answer

A)   graphite - network
B)   Na - metallic
C)   SiO2 - molecular
D)   NaCl - ionic
E)   diamond - networkF) A) and B)
G) C) and E)

Question 8

When the electron cloud of a molecule is easily distorted, the molecule has a high _____________.

Accepted Answer

A)   polarity
B)   polarizability
C)   dipole moment
D)   van der Waals radius
E)   compressibilityF) A) and E)
G) C) and D)

Question 9

When the adhesive forces between a liquid and the walls of a capillary tube are greater than the cohesive forces within the liquid

Accepted Answer

A)   the liquid level in a capillary tube will rise above the surrounding liquid and the surface in the capillary tube will have a convex meniscus.
B)   the liquid level in a capillary tube will rise above the surrounding liquid and the surface in the capillary tube will have a concave meniscus.
C)   the liquid level in a capillary tube will drop below the surrounding liquid and the surface in the capillary tube will have a convex meniscus.
D)   the liquid level in a capillary tube will drop below the surrounding liquid and the surface in the capillary tube will have a concave meniscus.
E)   None of these choices is correct.F) All of the above
G) C) and D)

Question 10

The maximum number of phases of a single substance which can coexist in equilibrium is two.

Accepted Answer

A) True 
 B)False

Question 11

In an ionic solid MX consisting of the monatomic ions, M+ and X-, the coordination number of M+ is ___.

Accepted Answer

A)   1
B)   2
C)   6
D)   8
E)   impossible to predict without knowing the crystal structure of MXF) A) and B)
G) A) and C)

Question 12

What adjective best describes the solid compound IF7?

Accepted Answer

A)   metallic
B)   amorphous
C)   covalent network
D)   molecular
E)   ionicF) C) and D)
G) B) and C)

Question 13

The strongest intermolecular interactions between hydrogen fluoride (HF)  molecules arise from

Accepted Answer

A)   dipole-dipole forces.
B)   London dispersion forces.
C)   hydrogen bonding.
D)   ion-dipole interactions.
E)   ionic bonds.F) C) and D)
G) A) and B)

Question 14

Select the pair of substances in which the one with the higher vapor pressure at a given temperature is listed first.

Accepted Answer

A)   C7H16, C5H12
B)   CCl4, CBr4
C)   H2O, H2S
D)   CH3CH2OH, CH3  7H16, C5H12 
B)   CCl4, CBr4 
C)   H2O, H2S 
D)    CH3CH2OH, CH3     O   CH3 
E)   Xe, Kr" class="answers-bank-image d-inline" rel="preload" > O7H16, C5H12 
B)   CCl4, CBr4 
C)   H2O, H2S 
D)    CH3CH2OH, CH3     O   CH3 
E)   Xe, Kr" class="answers-bank-image d-inline" rel="preload" > CH3
E)   Xe, KrF) D) and E)
G) A) and D)

Question 15

The energy gap between the conduction band and the valence band is large for

Accepted Answer

A)   conductors.
B)   semiconductors.
C)   superconductors.
D)   insulators.
E)   alloys.F) B) and C)
G) A) and D)

Question 16

List the three common classes of liquid crystals in order of decreasing degree of order.

Accepted Answer

smectic > ...

Question 17

In metals, the conduction bands and valence bands of the molecular orbitals are separated by a large energy gap.

Accepted Answer

A) True 
 B)False

Question 18

Iron crystallizes in the body-centered cubic lattice. What is the coordination number for Fe?

Accepted Answer

A)   4
B)   6
C)   8
D)   10
E)   12F) B) and C)
G) None of the above

Question 19

Which of the following terms refers to the resistance of a liquid to flow?

Accepted Answer

A)   surface tension
B)   capillary action
C)   viscosity
D)   adhesion
E)   cohesionF) A) and C)
G) A) and B)

Question 20

The highest temperature at which superconductivity has been achieved is approximately:

Accepted Answer

A)   4 K
B)   30 K
C)   70 K
D)   100 K
E)   130 KF) B) and C)
G) A) and E)

Exam 12: Intermolecular Forces: Liquids, Solids, and Phase Changes

The maximum number of phases of a single substance which can coexist in equilibrium is two.

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The Clausius-Clapeyron equation is used in calculations of

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When the adhesive forces between a liquid and the walls of a capillary tube are greater than the cohesive forces within the liquid

Correct AnswerverifiedShow Answer

Iron crystallizes in the body-centered cubic lattice. What is the coordination number for Fe?

Correct AnswerverifiedShow Answer

The coordination number of sodium and chloride ions in the NaCl lattice, are, respectively:

Correct AnswerverifiedShow Answer

Select the pair of substances in which the one with the higher vapor pressure at a given temperature is listed first.

Correct AnswerverifiedShow Answer

Draw a fully labeled phase diagram (P versus T) of a substance whose solid phase can melt due to applied pressure (i.e., solid is less dense than liquid). Clearly label the triple point and the critical temperature on your diagram.

Correct AnswerverifiedShow Answer

The energy gap between the conduction band and the valence band is large for

Correct AnswerverifiedShow Answer

Octane is a component of fuel used in internal combustion engines. The dominant intermolecular forces in octane are

Correct AnswerverifiedShow Answer

The strongest intermolecular interactions between hydrogen fluoride (HF) molecules arise from

Correct AnswerverifiedShow Answer

In metals, the conduction bands and valence bands of the molecular orbitals are separated by a large energy gap.

Correct AnswerverifiedShow Answer

Which of the following terms refers to the resistance of a liquid to flow?

Correct AnswerverifiedShow Answer

The highest temperature at which superconductivity has been achieved is approximately:

Correct AnswerverifiedShow Answer

List the three common classes of liquid crystals in order of decreasing degree of order.

Correct Answerverifiedsmectic > ...View AnswerShow Answer

Which of the following liquid substances would you expect to have the lowest surface tension?

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Which of the following should have the lowest boiling point?

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When the electron cloud of a molecule is easily distorted, the molecule has a high _____________.

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Which one of the following substances does not exist in the indicated solid type?

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In an ionic solid MX consisting of the monatomic ions, M+ and X-, the coordination number of M+ is ___.

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What adjective best describes the solid compound IF7?

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smectic > ...
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In an ionic solid MX consisting of the monatomic ions, M⁺ and X^-, the coordination number of M⁺ is ___.

Correct Answer
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What adjective best describes the solid compound IF₇?

Correct Answer
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