Question 1

The strongest intermolecular interactions between pentane (C5H12)  molecules arise from

Accepted Answer

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

Question 2

Some of the information obtained from the heating or cooling curve of a substance can also be found on a phase diagram of that substance.

Accepted Answer

A) True 
 B)False

Question 3

Which of the following pairs of molecules can form hydrogen bonds between them?

Accepted Answer

A)  HCl and HI
B)  CH 3OH and NH 3
C)  CH 4 and H 2O
D)  SO 2 and CH 2O
E)  H 2 and O 2F) A) and E)
G) B) and E)

Question 4

A temperature increase causes __________ in the conductivity of a semiconductor.

Accepted Answer

A)  a decrease
B)  an increase
C)  a modulation
D)  an increase or decrease (depending on the semiconductor) 
E)  no changeF) A) and E)
G) A) and B)

Question 5

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 6

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

Question 7

Smectic liquid crystals are more highly ordered than either nematic or cholesteric liquid crystals.

Accepted Answer

A) True 
 B)False

Question 8

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

Question 9

The meniscus of mercury in a glass capillary tube is convex because of

Accepted Answer

A)  the very high density of mercury as compared with water.
B)  the low surface tension of mercury.
C)  the greater attraction of mercury atoms to the glass than to each other.
D)  the weaker attraction of mercury atoms to the glass than to each other.
E)  electrostatic repulsion between the glass and the mercury.F) B) and E)
G) A) and E)

Question 10

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

Accepted Answer

A)  graphite - network
B)  Na - metallic
C)  SiO 2 - molecular
D)  NaCl - ionic
E)  diamond - networkF) A) and C)
G) All of the above

Question 11

Which of the following atoms should have the smallest polarizability?

Accepted Answer

A)  Si
B)  S
C)  Te
D)  Bi
E)  BrF) D) and E)
G) B) and E)

Question 12

A certain solid metallic element has a density 7.87 g/cm3 and a molar mass of 55.85 g/mol. It crystallizes with a cubic unit cell, with an edge length of 286.7 pm. Calculate the number of atoms per unit cell.

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  6F) C) and D)
G) A) and B)

Question 13

What word best describes the type of liquid crystal represented below? {MISSING IMAGE}

Accepted Answer

A)  nematic
B)  cholesteric
C)  smectic
D)  isotropic
E)  elasticF) B) and E)
G) A) and B)

Question 14

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)  It is impossible to predict without knowing the crystal structure of MX.F) A) and D)
G) All of the above

Question 15

Pentane, C5H12, boils at 35°C. Which of the following is true about kinetic energy, Ek, and potential energy, Ep, when liquid pentane at 35°C is compared with pentane vapor at 35°C?

Accepted Answer

A)  E k( g) k( l) ; E p( g) ≈ E p( l) 
B)  E k( g) > E k( l) ; E p( g) ≈ E p( l) 
C)  E p( g) p( l) ; E k( g) ≈ E k( l) 
D)  E p( g) > E p( l) ; E k( g) ≈ E k( l) 
E)  E p( g) ≈ E p( l) ; E k( g) ≈ E k( l) F) A) and E)
G) A) and B)

Question 16

In hydrogen iodide__________ are the most important intermolecular forces.

Accepted Answer

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

Question 17

Which of the following atoms should have the greatest polarizability?

Accepted Answer

A)  F
B)  Br
C)  Po
D)  Pb
E)  HeF) C) and E)
G) None of the above

Question 18

A cubic unit cell has an edge length of 400. pm. The length of its body diagonal (internal diagonal)  in pm is therefore

Accepted Answer

A)  512.
B)  566.
C)  631.
D)  693.
E)  724.F) None of the above
G) A) and E)

Question 19

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

Accepted Answer

A)  Pb
B)  CH 3OCH 3
C)  HOCH 2CH 2OH
D)  H 2O
E)  CH 3CH 2OHF) A) and E)
G) A) and D)

Question 20

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

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

What word best describes the type of liquid crystal represented below? {MISSING IMAGE}

Correct AnswerverifiedShow Answer

The strongest intermolecular interactions between pentane (C5H12) molecules arise from

Correct AnswerverifiedShow Answer

Which of the following atoms should have the smallest polarizability?

Correct AnswerverifiedShow Answer

A temperature increase causes __________ in the conductivity of a semiconductor.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following atoms should have the greatest polarizability?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A cubic unit cell has an edge length of 400. pm. The length of its body diagonal (internal diagonal) in pm is therefore

Correct AnswerverifiedShow Answer

The Clausius-Clapeyron equation is used in calculations of

Correct AnswerverifiedShow Answer

A certain solid metallic element has a density 7.87 g/cm3 and a molar mass of 55.85 g/mol. It crystallizes with a cubic unit cell, with an edge length of 286.7 pm. Calculate the number of atoms per unit cell.

Correct AnswerverifiedShow Answer

In hydrogen iodide__________ are the most important intermolecular forces.

Correct AnswerverifiedShow Answer

Which of the following pairs of molecules can form hydrogen bonds between them?

Correct AnswerverifiedShow Answer

Some of the information obtained from the heating or cooling curve of a substance can also be found on a phase diagram of that substance.

Correct AnswerverifiedShow Answer

The meniscus of mercury in a glass capillary tube is convex because of

Correct AnswerverifiedShow Answer

Pentane, C5H12, boils at 35°C. Which of the following is true about kinetic energy, Ek, and potential energy, Ep, when liquid pentane at 35°C is compared with pentane vapor at 35°C?

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Smectic liquid crystals are more highly ordered than either nematic or cholesteric liquid crystals.

Correct AnswerverifiedShow Answer

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The strongest intermolecular interactions between pentane (C₅H₁₂) molecules arise from

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A certain solid metallic element has a density 7.87 g/cm³ and a molar mass of 55.85 g/mol. It crystallizes with a cubic unit cell, with an edge length of 286.7 pm. Calculate the number of atoms per unit cell.

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Pentane, C₅H₁₂, boils at 35°C. Which of the following is true about kinetic energy, E_k, and potential energy, E_p, when liquid pentane at 35°C is compared with pentane vapor at 35°C?

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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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