Question 1

What adjective best describes the solid compound IF7?

Accepted Answer

A)   metallic
B)   amorphous
C)   covalent network
D)   molecular
E)   ionicF) A) and B)
G) None of the above

Question 2

A metal such with a face-centered cubic lattice will have ________________ atom(s)  per unit cell.

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   10F) All of the above
G) D) and E)

Question 3

Which one of the following substances will have hydrogen bonds between molecules?

Accepted Answer

A)   (CH3) 3N
B)   CH3-O-CH3
C)   CH3CH2-OH
D)   CH3CH2-F
E)   HIF) A) and D)
G) C) and E)

Question 4

The strongest intermolecular interactions between hydrogen sulfide (H2S)  molecules arise from

Accepted Answer

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

Question 5

If the solid form of a pure substance is denser than its liquid form, an increase in pressure will cause the melting point to decrease.

Accepted Answer

A) True 
 B)False

Question 6

Neon atoms are attracted to each other by

Accepted Answer

A)   dipole-dipole forces.
B)   London dispersion forces.
C)   hydrogen bonding.
D)   covalent bonding.
E)   intramolecular forces.F) B) and E)
G) D) and E)

Question 7

The energy of a hydrogen bond is greater than that of a typical covalent bond.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following pairs of substances is arranged so that the one with higher viscosity is listed first?

Accepted Answer

A)   
B)   
C)   
D)   
E)   None of the answers are correct F) B) and D)
G) A) and D)

Question 9

In a transistor, the current through one semiconductor junction controls the current through a neighboring junction.

Accepted Answer

A) True 
 B)False

Question 10

In which of the following compounds will the molecules not form hydrogen bonds with each other?

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) A) and E)
G) B) and C)

Question 11

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 12

The phase diagram of a substance can be used to obtain the vapor pressure of that substance at a given temperature.

Accepted Answer

A) True 
 B)False

Question 13

Which of the following pairs is arranged with the particle of higher polarizability listed first?

Accepted Answer

A)   CCl4, CI4
B)   H2O, H2Se
C)   C6H14, C4H10
D)   NH3, NF3
E)   None of these choices are correct.F) C) and D)
G) None of the above

Question 14

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

Question 15

Only molecules that do not have dipole moments can experience dispersion forces.

Accepted Answer

A) True 
 B)False

Question 16

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

Accepted Answer

A) True 
 B)False

Question 17

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

Question 18

A liquid may be made to boil at room temperature, simply by lowering the pressure.

Accepted Answer

A) True 
 B)False

Question 19

Which of the following should have the lowest boiling point?

Accepted Answer

A)   C5H12
B)   C6H14
C)   C8H18
D)   C10H22
E)   C12H26F) None of the above
G) A) and B)

Question 20

The normal boiling point of ether is 307.8 K. Calculate the temperature at which its vapor pressure is exactly half of that at its normal boiling point. The heat of vaporization for ether is 26.69 kJ/mol.

Accepted Answer

A)   305 K
B)   302 K
C)   295 K
D)   289 K
E)   281 KF) A) and C)
G) B) and C)

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

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

Which of the following should have the lowest boiling point?

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

What adjective best describes the solid compound IF7?

Correct AnswerverifiedShow Answer

A metal such with a face-centered cubic lattice will have ________________ atom(s) per unit cell.

Correct AnswerverifiedShow Answer

Neon atoms are attracted to each other by

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The energy of a hydrogen bond is greater than that of a typical covalent bond.

Correct AnswerverifiedShow Answer

Which of the following pairs of substances is arranged so that the one with higher viscosity is listed first?

Correct AnswerverifiedShow Answer

If the solid form of a pure substance is denser than its liquid form, an increase in pressure will cause the melting point to decrease.

Correct AnswerverifiedShow Answer

In which of the following compounds will the molecules not form hydrogen bonds with each other?

Correct AnswerverifiedShow Answer

A liquid may be made to boil at room temperature, simply by lowering the pressure.

Correct AnswerverifiedShow Answer

Which of the following pairs is arranged with the particle of higher polarizability listed first?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In a transistor, the current through one semiconductor junction controls the current through a neighboring junction.

Correct AnswerverifiedShow Answer

The strongest intermolecular interactions between hydrogen sulfide (H2S) molecules arise from

Correct AnswerverifiedShow Answer

Which one of the following substances will have hydrogen bonds between molecules?

Correct AnswerverifiedShow Answer

The phase diagram of a substance can be used to obtain the vapor pressure of that substance at a given temperature.

Correct AnswerverifiedShow Answer

The normal boiling point of ether is 307.8 K. Calculate the temperature at which its vapor pressure is exactly half of that at its normal boiling point. The heat of vaporization for ether is 26.69 kJ/mol.

Correct AnswerverifiedShow Answer

Only molecules that do not have dipole moments can experience dispersion forces.

Correct AnswerverifiedShow Answer

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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What adjective best describes the solid compound IF₇?

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

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The strongest intermolecular interactions between hydrogen sulfide (H₂S) molecules arise from

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