Question 1

Which one of the following involves ion-dipole interactions?

Accepted Answer

A)   Na+ and Cl-
B)   H+ and F-
C)   Na+ and Mg2+ 
D)   two water molecules
E)   Na+ and H2OF) A) and D)
G) A) and B)

Question 2

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

Accepted Answer

A)   graphite-covalent crystals
B)   Na-metallic crystals
C)   SiO2-molecular crystals
D)   NaCl-ionic crystals
E)   diamond-covalent crystalsF) D) and E)
G) B) and E)

Question 3

Which are considered van der Waals forces?

Accepted Answer

A)   I and III
B)   II only
C)   III only
D)   I, II, and III
E)   I onlyF) C) and E)
G) All of the above

Question 4

Identify the dominant (strongest) type of intermolecular force present in RbCl(s).

Accepted Answer

The answer of Identify the dominant (strongest) type of intermolecular...

Question 5

At what temperature does ethanol boil on a day in the mountains when the barometric pressure is 547 mmHg? The heat of vaporization of ethanol is 39.3 kJ/mol and its normal boiling point is 78.3°C. (R = 8.314 J/K • mol)

Accepted Answer

A)   76.5°C
B)   69.9°C
C)   10.0°C
D)   77.9°C
E)   74.6°CF) D) and E)
G) A) and B)

Question 6

Based on the phase diagram of a pure substance given below, what phase exists at point F?

Accepted Answer

A)   vapor + liquid
B)   vapor
C)   liquid
D)   solid
E)   supercritical fluidF) B) and D)
G) A) and E)

Question 7

The surface tension of water is lowered when a detergent is present in solution.

Accepted Answer

A) True 
 B)False

Question 8

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. Cub...

Question 9

The vapor pressure of ethanol is 400. mmHg at 63.5°C. Its molar heat of vaporization is 39.3 kJ/mol. What is the vapor pressure of ethanol, in mmHg, at 34.9°C? (R = 8.314 J/K • mol)

Accepted Answer

A)   109 mmHg
B)   220 mmHg
C)   366 mmHg
D)   376 mmHg
E)   1470 mmHgF) A) and D)
G) B) and E)

Question 10

Platinum has a face-centered cubic crystal structure and a density of 21.5 g/cm3. What is the radius of a platinum atom?

Accepted Answer

A)   69 pm
B)   98 pm
C)   139 pm
D)   196 pm
E)   277 pmF) A) and B)
G) A) and C)

Question 11

Which of the following factors can contribute to the viscosity for a liquid?

Accepted Answer

A)   Temperature
B)   Hydrogen bonding
C)   Molecular entanglements
D)   London forces
E)   All of the answers are correct.F) C) and D)
G) A) and E)

Question 12

Which of the following atoms does not participate in hydrogen bonding?

Accepted Answer

A)   S
B)   O
C)   F
D)   N
E)   HF) B) and C)
G) A) and E)

Question 13

Choose the response that lists the member of each of the following pairs that has the higher boiling point. I. H2O or KI, II. HF or HI, III. Cl2 or Br2

Accepted Answer

A)   H2O, HF, and Cl2
B)   KI, HF, and Br2
C)   KI, HI, and Br2 
D)   H2O, HI, and Cl2
E)   KI, HF, and Cl2F) A) and C)
G) A) and B)

Question 14

Krypton has a higher melting point than argon because of its

Accepted Answer

A)   hydrogen bonding.
B)   stronger dispersion forces.
C)   permanent dipole moment.
D)   ionic bonds.
E)   greater ionization energy.F) A) and B)
G) A) and C)

Question 15

Below is the phase diagram for sulfur. Which phase is present at 100°C and 1 atm?

Accepted Answer

A)   liquid
B)   vapor
C)   rhombic solid
D)   monoclinic solid
E)   liquid-vapor boundary lineF) A) and B)
G) A) and C)

Question 16

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

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) B) and C)
G) All of the above

Question 17

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-O-CH3
E)   Xe, KrF) None of the above
G) B) and C)

Question 18

The zincblende structure of ZnS has the relatively large sulfide ions arranged at the lattice points of a face-centered cubic structure. The edge length of this cubic unit cell is 540.9 pm. Determine the density of zincblende.

Accepted Answer

A)   0.244 g/cm3
B)   1.02 g/cm3
C)   2.05 g/cm3
D)   4.09 g/cm3
E)   8.18 g/cm3F) A) and E)
G) C) and E)

Question 19

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? (R = 8.314 J/K • mol)

Accepted Answer

A)   39.1 kJ/mol
B)   46.0 kJ/mol
C)   590 kJ/mol
D)   710 kJ/mol
E)   None of these choices is correct.F) B) and C)
G) A) and E)

Question 20

Poor conductor of heat and electricity, soft, and low melting point are properties which describe a(n) ________ crystal.

Accepted Answer

The answer of Poor conductor of heat and electricity, soft,...

Exam 11: Intermolecular Forces and the Physical Properties of Liquids and Solids

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

Correct AnswerverifiedShow Answer

Platinum has a face-centered cubic crystal structure and a density of 21.5 g/cm3. What is the radius of a platinum atom?

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

Identify the dominant (strongest) type of intermolecular force present in RbCl(s).

Correct AnswerverifiedShow Answer

The zincblende structure of ZnS has the relatively large sulfide ions arranged at the lattice points of a face-centered cubic structure. The edge length of this cubic unit cell is 540.9 pm. Determine the density of zincblende.

Correct AnswerverifiedShow Answer

Based on the phase diagram of a pure substance given below, what phase exists at point F?

Correct AnswerverifiedShow Answer

Poor conductor of heat and electricity, soft, and low melting point are properties which describe a(n) ________ crystal.

Correct AnswerverifiedShow Answer

The vapor pressure of ethanol is 400. mmHg at 63.5°C. Its molar heat of vaporization is 39.3 kJ/mol. What is the vapor pressure of ethanol, in mmHg, at 34.9°C? (R = 8.314 J/K • mol)

Correct AnswerverifiedShow Answer

Below is the phase diagram for sulfur. Which phase is present at 100°C and 1 atm?

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? (R = 8.314 J/K • mol)

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. Cub...View AnswerShow Answer

Which are considered van der Waals forces?

Correct AnswerverifiedShow Answer

Which one of the following involves ion-dipole interactions?

Correct AnswerverifiedShow Answer

Which of the following atoms does not participate in hydrogen bonding?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Choose the response that lists the member of each of the following pairs that has the higher boiling point. I. H2O or KI, II. HF or HI, III. Cl2 or Br2

Correct AnswerverifiedShow Answer

The surface tension of water is lowered when a detergent is present in solution.

Correct AnswerverifiedShow Answer

Krypton has a higher melting point than argon because of its

Correct AnswerverifiedShow Answer

At what temperature does ethanol boil on a day in the mountains when the barometric pressure is 547 mmHg? The heat of vaporization of ethanol is 39.3 kJ/mol and its normal boiling point is 78.3°C. (R = 8.314 J/K • mol)

Correct AnswerverifiedShow Answer

Which of the following factors can contribute to the viscosity for a liquid?

Correct AnswerverifiedShow Answer

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Platinum has a face-centered cubic crystal structure and a density of 21.5 g/cm³. What is the radius of a platinum atom?

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a. face-centered cubic; hexagonal
b. Cub...
View Answer

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Choose the response that lists the member of each of the following pairs that has the higher boiling point. I. H₂O or KI, II. HF or HI, III. Cl₂ or Br₂

Correct Answer
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