Question 1

Liquid crystal displays are most commonly constructed of smectic type liquid crystals.

Accepted Answer

A) True 
 B)False

Question 2

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

Question 3

The highest temperature at which superconductivity has been achieved is approximately

Accepted Answer

A)   4 K.
B)   30 K.
C)   70 K.
D)   100 K.
E)   130 K.F) B) and E)
G) A) and E)

Question 4

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) C) and E)

Question 5

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

Question 6

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

Accepted Answer

A)   graphite - network
B)   Na - metallic
C)   SiO2 - molecular
D)   NaCl - ionic
E)   diamond - networkF) All of the above
G) B) and C)

Question 7

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

Question 8

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 choices are correct.F) A) and B)
G) A) and E)

Question 9

A cubic unit cell has an edge length of 400. pm. The length of its body diagonal (internal diagonal)  in pm is therefore

Accepted Answer

A)   512.
B)   566.
C)   631.
D)   693.
E)   724.F) A) and B)
G) A) and C)

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

In cubic closest packing, the unit cell is body-centered cubic.

Accepted Answer

A) True 
 B)False

Question 12

A metal with a body-centered cubic lattice will have ______ atom(s)  per unit cell.

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   9F) A) and B)
G) A) and C)

Question 13

Iron crystallizes in the body-centered cubic lattice. What is the coordination number for Fe?

Accepted Answer

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

Question 14

When silicon is doped with an element from group 3A(13) , the device/material produced is a/an

Accepted Answer

A)   intrinsic semiconductor.
B)   p-type semiconductor.
C)   n-type semiconductor.
D)   p-n junction.
E)   transistor.F) A) and B)
G) All of the above

Question 15

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 are correct.F) B) and D)
G) C) and E)

Question 16

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

Question 17

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 E)
G) B) and E)

Question 18

Which of the following liquids is likely to have the highest surface tension?

Accepted Answer

A)   Br2
B)   C8H18
C)   CH3OCH3
D)   CH3OH
E)   PbF) B) and E)
G) B) and D)

Question 19

What types of forces exist between molecules of CO2?

Accepted Answer

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

Question 20

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 are correct.F) None of the above
G) A) and E)

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

What types of forces exist between molecules of CO2?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A metal with a body-centered cubic lattice will have ______ atom(s) per unit cell.

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

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

Correct AnswerverifiedShow Answer

In cubic closest packing, the unit cell is body-centered cubic.

Correct AnswerverifiedShow Answer

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

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

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

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

Liquid crystal displays are most commonly constructed of smectic type liquid crystals.

Correct AnswerverifiedShow Answer

When silicon is doped with an element from group 3A(13) , the device/material produced is a/an

Correct AnswerverifiedShow Answer

The highest temperature at which superconductivity has been achieved is approximately

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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

Iron crystallizes in the body-centered cubic lattice. What is the coordination number for Fe?

Correct AnswerverifiedShow Answer

Which of the following liquids is likely to have the highest surface tension?

Correct AnswerverifiedShow Answer

A cubic unit cell has an edge length of 400. pm. The length of its body diagonal (internal diagonal) in pm is therefore

Correct AnswerverifiedShow Answer

What types of forces exist between molecules of CO₂?

Correct Answer
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