Question 1

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 B)
G) A) and C)

Question 2

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

Question 3

All gases can be liquefied at room temperature simply by increasing the pressure on the gas.

Accepted Answer

A) True 
 B)False

Question 4

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 the aboveF) D) and E)
G) All of the above

Question 5

Iron has a body-centered cubic unit cell, and a density of 7.87 g/cm3. Calculate the edge length of the unit cell, in pm. (The atomic mass of iron is 55.85 amu. Also, 1 amu = 1.661 × 10-24 g.)

Accepted Answer

Question 6

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

Accepted Answer

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

Question 7

Consider the following phase diagram and identify the process occurring as one goes from point C to point D.

Accepted Answer

A)   increasing temperature with a phase change from solid to liquid
B)   increasing temperature with a phase change from solid to vapor
C)   increasing temperature with a phase change from liquid to vapor
D)   increasing temperature with no phase change
E)   increasing temperature beyond the critical pointF) B) and E)
G) A) and E)

Question 8

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

Question 9

Liquid ammonia boils at -33.4°C and has a heat of vaporization of 23.5 kJ/mol. Calculate its vapor pressure at -50.0°C.

Accepted Answer

The answer of Liquid ammonia boils at -33.4°C and has...

Question 10

Polonium crystallizes in the simple cubic lattice. What is the coordination number for Po?

Accepted Answer

A)   3
B)   4
C)   6
D)   8
E)   12F) B) and C)
G) None of the above

Question 11

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

Question 12

Lead crystallizes in the face-centered cubic lattice. What is the coordination number for Pb?

Accepted Answer

A)   4
B)   6
C)   8
D)   10
E)   12F) B) and C)
G) A) and C)

Question 13

Which of the following properties measures the energy needed to increase the surface area of a liquid?

Accepted Answer

A)   capillary action
B)   surface tension
C)   viscosity
D)   cohesion
E)   specific elasticityF) B) and C)
G) D) and E)

Question 14

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

Accepted Answer

A) True 
 B)False

Question 15

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 16

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

Accepted Answer

A) True 
 B)False

Question 17

The density of solid sodium chloride, NaCl, is 2.17 g/cm3. Use your knowledge of the sodium chloride lattice to calculate the spacing between Na+ and Cl- nearest neighbors, in cm.
(Atomic masses (amu) are: Na, 22.99; Cl, 35.45. Also, 1 amu = 1.661 × 10-24 g)

Accepted Answer

Question 18

How do the electrical properties of semiconductors differ from those of metals?

Accepted Answer

Metals are good conductors who...

Question 19

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

Accepted Answer

A) True 
 B)False

Question 20

Which of the following atoms should have the greatest polarizability?

Accepted Answer

A)   F
B)   Br
C)   Po
D)   Pb
E)   HeF) A) and E)
G) B) and E)

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

All gases can be liquefied at room temperature simply by increasing the pressure on the gas.

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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.

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

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Iron has a body-centered cubic unit cell, and a density of 7.87 g/cm3. Calculate the edge length of the unit cell, in pm. (The atomic mass of iron is 55.85 amu. Also, 1 amu = 1.661 × 10-24 g.)

Correct AnswerverifiedShow Answer

Lead crystallizes in the face-centered cubic lattice. What is the coordination number for Pb?

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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

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Liquid ammonia boils at -33.4°C and has a heat of vaporization of 23.5 kJ/mol. Calculate its vapor pressure at -50.0°C.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The density of solid sodium chloride, NaCl, is 2.17 g/cm3. Use your knowledge of the sodium chloride lattice to calculate the spacing between Na+ and Cl- nearest neighbors, in cm. (Atomic masses (amu) are: Na, 22.99; Cl, 35.45. Also, 1 amu = 1.661 × 10-24 g)

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

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Consider the following phase diagram and identify the process occurring as one goes from point C to point D.

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How do the electrical properties of semiconductors differ from those of metals?

Correct AnswerverifiedMetals are good conductors who...View AnswerShow Answer

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

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Which of the following properties measures the energy needed to increase the surface area of a liquid?

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

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

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Polonium crystallizes in the simple cubic lattice. What is the coordination number for Po?

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Which of the following atoms should have the greatest polarizability?

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Iron has a body-centered cubic unit cell, and a density of 7.87 g/cm³. Calculate the edge length of the unit cell, in pm. (The atomic mass of iron is 55.85 amu. Also, 1 amu = 1.661 × 10^-24 g.)

Correct Answer
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The density of solid sodium chloride, NaCl, is 2.17 g/cm³. Use your knowledge of the sodium chloride lattice to calculate the spacing between Na⁺ and Cl^- nearest neighbors, in cm. (Atomic masses (amu) are: Na, 22.99; Cl, 35.45. Also, 1 amu = 1.661 × 10^-24 g)

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Metals are good conductors who...
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