Question 1

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

Accepted Answer

A)  Se2-,S2-
B)  I,I-
C)  Mg2+,Mg
D)  Br,I
E)  None of these choices is correct.F) C) and D)
G) A) and E)

Question 2

Octane has a vapor pressure of 40.torr at 45.1°C and 400.torr at 104.0°C.What is its heat of vaporization?

Accepted Answer

A)  39.0 kJ/mol
B)  46.0 kJ/mol
C)  590 kJ/mol
D)  710 kJ/mol
E)  None of these choices is correct.F) A) and E)
G) B) and D)

Question 3

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

Accepted Answer

A) True 
 B)False

Question 4

Which of the following should have the highest surface tension at a given temperature?

Accepted Answer

A)  a
B)  b
C)  c
D)  d
E)  eF) B) and E)
G) B) and D)

Question 5

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)  compressibility.F) C) and D)
G) A) and B)

Question 6

A sample of octane in equilibrium with its vapor in a closed 1.0-L container has a vapor pressure of 50.0 torr at 45°C.The container's volume is increased to 2.0 L at constant temperature and the liquid/vapor equilibrium is reestablished.What is the vapor pressure?

Accepted Answer

A)  > 50.0 torr
B)  50.0 torr
C)  25.0 torr
D)  The mass of the octane vapor is needed to calculate the vapor pressure.
E)  The external pressure is needed to calculate the vapor pressure.F) A) and E)
G) A) and D)

Question 7

A single water molecule can participate in at most two hydrogen bonds at any instant.

Accepted Answer

A) True 
 B)False

Question 8

The strongest intermolecular interactions between ethyl alcohol (CH3CH2OH) molecules arise from

Accepted Answer

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

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 will occur.F) A) and D)
G) A) and B)

Question 10

Which of the following factors contributes to a low viscosity for a liquid?

Accepted Answer

A)  low temperature
B)  spherical molecular shape
C)  hydrogen bonding
D)  high molecular weight
E)  high boiling pointF) B) and D)
G) A) and E)

Question 11

Examine the following phase diagram and identify the feature represented by point A.

Accepted Answer

A)  melting point
B)  critical point
C)  triple point
D)  sublimation point
E)  boiling pointF) C) and D)
G) A) and E)

Question 12

a.Name the two unit cells which occur in close packing of identical atoms.
b.Briefly explain how the two types of close-packed lattices of identical atoms differ,in terms of atomic arrangements.

Accepted Answer

a.face-centered cubic;hexagonal
b.Cubic ...

Question 13

Which of the following is true about kinetic energy,Ek,and potential energy,Ep,when ethyl alcohol at 40°C is compared with ethyl alcohol at 20°C?

Accepted Answer

A)  Ek(40°
C)  k(20°
C)  ;Ep(40°
C)    ≈\approx≈  Ep(20°
C)  
B)  Ek(40°
C)  > Ek(20°
C)  ;Ep(40°
C)    ≈\approx≈  Ep(20°
C)  
C)  Ep(40°
C)  p(20°
C)  ;Ek(40°
C)    ≈\approx≈  Ek(20°
C)  
D)  Ep(40°
C)  > Ep(20°
C)  ;Ek(40°
C)     ≈\approx≈  Ek(20°
C)  
E)  Ep(40°
C)  > Ep(20°
C)  ;Ek(40°
C)  > Ek(20°
C)   F) A) and B)
G) None of the above

Question 14

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) All of the above
G) A) and B)

Question 15

Which one of the following quantities is generally not obtainable from a single heating or cooling curve of a substance,measured at atmospheric pressure?

Accepted Answer

A)  melting point
B)  boiling point
C)  triple point
D)  heat of fusion
E)  heat of vaporizationF) None of the above
G) A) and D)

Question 16

Which one of the following statements about unit cells and packing in solids is incorrect?

Accepted Answer

A)  In any unit cell of a solid crystal,each face of the cell must have an opposite face which is equal and parallel to it.
B)  The faces of a unit cell must all be at angles of 90° to each other.
C)  The coordination number of atoms in a close packed metal is 12.
D)  The packing efficiency in fcc structures is higher than in bcc structures.
E)  The packing efficiency in fcc and hcp structures is the same.F) A) and C)
G) B) and C)

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) C) and D)
G) D) and E)

Question 18

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

Question 19

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

Accepted Answer

A) True 
 B)False

Question 20

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 E)
G) None of the above

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.

Correct AnswerverifiedShow Answer

Which of the following is true about kinetic energy,Ek,and potential energy,Ep,when ethyl alcohol at 40°C is compared with ethyl alcohol at 20°C?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which one of the following quantities is generally not obtainable from a single heating or cooling curve of a substance,measured at atmospheric pressure?

Correct AnswerverifiedShow Answer

a.Name the two unit cells which occur in close packing of identical atoms. b.Briefly explain how the two types of close-packed lattices of identical atoms differ,in terms of atomic arrangements.

Correct Answerverifieda.face-centered cubic;hexagonalb.Cubic ...View AnswerShow Answer

The strongest intermolecular interactions between ethyl alcohol (CH3CH2OH) molecules arise from

Correct AnswerverifiedShow Answer

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

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A single water molecule can participate in at most two hydrogen bonds at any instant.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following should have the highest surface tension at a given temperature?

Correct AnswerverifiedShow Answer

Which of the following factors contributes to a low viscosity for a liquid?

Correct AnswerverifiedShow Answer

Octane has a vapor pressure of 40.torr at 45.1°C and 400.torr at 104.0°C.What is its heat of vaporization?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A sample of octane in equilibrium with its vapor in a closed 1.0-L container has a vapor pressure of 50.0 torr at 45°C.The container's volume is increased to 2.0 L at constant temperature and the liquid/vapor equilibrium is reestablished.What is the vapor pressure?

Correct AnswerverifiedShow Answer

Examine the following phase diagram and identify the feature represented by point A.

Correct AnswerverifiedShow Answer

Which one of the following statements about unit cells and packing in solids is incorrect?

Correct AnswerverifiedShow Answer

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

Correct Answer
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Which of the following is true about kinetic energy,E_k,and potential energy,E_p,when ethyl alcohol at 40°C is compared with ethyl alcohol at 20°C?

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

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a.face-centered cubic;hexagonal
b.Cubic ...
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The strongest intermolecular interactions between ethyl alcohol (CH₃CH₂OH) molecules arise from

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

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