Question 1

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

Question 2

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 3

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

Question 4

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

Question 5

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

Question 6

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

Accepted Answer

A) True 
 B)False

Question 7

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

Accepted Answer

A) True 
 B)False

Question 8

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 D)
G) B) and C)

Question 9

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

Question 10

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 11

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

Accepted Answer

Metals are good conductors who...

Question 12

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 D)
G) A) and E)

Question 13

Which of the following atoms should have the greatest polarizability?

Accepted Answer

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

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

Accepted Answer

A) True 
 B)False

Question 16

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

Question 17

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 18

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

Question 19

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 D)
G) D) and E)

Question 20

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...

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

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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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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 atoms should have the greatest polarizability?

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

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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.

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

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

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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

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

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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

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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)

Correct AnswerverifiedShow Answer

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Metals are good conductors who...
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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)

Correct Answer
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