Question 1

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)   724F) A) and B)
G) None of the above

Question 2

If the solid form of a pure substance is denser than its liquid form, an increase in pressure will cause the melting point to decrease.

Accepted Answer

A) True 
 B)False

Question 3

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

Accepted Answer

A) True 
 B)False

Question 4

The energy of a hydrogen bond is greater than that of a typical covalent bond.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following pairs of molecules can form hydrogen bonds between them?

Accepted Answer

A)   HCl and HI
B)   CH3OH and NH3
C)   CH4 and H2O
D)   SO2 and CH2O
E)   H2 and O2F) A) and B)
G) D) and E) B

Question 6

In the packing of identical atoms with cubic unit cells, the packing efficiency increases as the coordination number increases.

Accepted Answer

A) True 
 B)False  True

Question 7

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 B)
G) A) and C)

Question 8

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

Question 9

The phase diagram of a substance can be used to obtain the vapor pressure of that substance at a given temperature.

Accepted Answer

A) True 
 B)False

Question 10

Ceramic superconductors often contain copper in unusual oxidation states.

Accepted Answer

A) True 
 B)False

Question 11

Crystal structures may be conveniently measured using

Accepted Answer

A)   X-ray diffraction.
B)   infrared spectroscopy.
C)   ultraviolet-visible spectroscopy.
D)   microwave spectroscopy.
E)   magnetic resonance imaging.F) A) and D)
G) A) and E) A

Question 12

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

Accepted Answer

A) True 
 B)False

Question 13

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

Accepted Answer

A)   CCl4, CI4
B)   H2O, H2Se
C)   C6H14, C4H10
D)   NH3, NF3
E)   None of these choices is correct.F) C) and D)
G) None of the above

Question 14

For the solid forms of the following elements, which one is most likely to be of the molecular type?

Accepted Answer

A)   Xe
B)   C
C)   Pb
D)   S
E)   CrF) A) and B)
G) B) and D)

Question 15

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

Accepted Answer

A)   3CH2CH2OH 
B)   PH3 and NH3 
C)   CF4 and CBr4 
D)   C3H8 and C4H10 
E)   F2 and Cl2" class="answers-bank-image d-inline" rel="preload" > and CH3CH2CH2OH
B)   PH3 and NH3
C)   CF4 and CBr4
D)   C3H8 and C4H10
E)   F2 and Cl2F) B) and E)
G) A) and E)

Question 16

Neon atoms are attracted to each other by

Accepted Answer

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

Question 17

Octane has a vapor pressure of 40. torr at 45.1 °\degree° C and 400. torr at 104.0 °\degree° 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) C) and D)
G) B) and E)

Question 18

In a transistor, the current through one semiconductor junction controls the current through a neighboring junction.

Accepted Answer

A) True 
 B)False

Question 19

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

Accepted Answer

A)   CH4
B)   CF4
C)   CCl4
D)   CBr4
E)   CI4F) A) and B)
G) B) and C)

Question 20

Mercury melts at -39$\degree$C and boils at 357$\degree$C. Draw a diagram of the heating curve of mercury. Label all lines and axes, and clearly indicate the melting and boiling points on your diagram.

Accepted Answer

The answer of Mercury melts at -39$\degree$C and boils at...

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

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

If the solid form of a pure substance is denser than its liquid form, an increase in pressure will cause the melting point to decrease.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The energy of a hydrogen bond is greater than that of a typical covalent bond.

Correct AnswerverifiedShow Answer

Which of the following pairs of molecules can form hydrogen bonds between them?

Correct AnswerverifiedB

In the packing of identical atoms with cubic unit cells, the packing efficiency increases as the coordination number increases.

Correct AnswerverifiedTrue

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The phase diagram of a substance can be used to obtain the vapor pressure of that substance at a given temperature.

Correct AnswerverifiedShow Answer

Ceramic superconductors often contain copper in unusual oxidation states.

Correct AnswerverifiedShow Answer

Crystal structures may be conveniently measured using

Correct AnswerverifiedA

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

For the solid forms of the following elements, which one is most likely to be of the molecular type?

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

Neon atoms are attracted to each other by

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In a transistor, the current through one semiconductor junction controls the current through a neighboring junction.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Mercury melts at -39 °\degree° C and boils at 357 °\degree° C. Draw a diagram of the heating curve of mercury. Label all lines and axes, and clearly indicate the melting and boiling points on your diagram.

Correct AnswerverifiedShow Answer

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True

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A

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

Correct Answer
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Mercury melts at -39 $\degree$ C and boils at 357 $\degree$ C. Draw a diagram of the heating curve of mercury. Label all lines and axes, and clearly indicate the melting and boiling points on your diagram.

Correct Answer
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