Multiple
Choice
Identify the letter of the choice that best completes the statement or answers the
question.
|
|
|
1.
|
Which of the following
statements concerning intermolecular forces are CORRECT?
1. | London dispersion forces exist in all molecular solids. | 2. | Dipole-dipole attractions occur in all molecules that contain polar
bonds. | 3. | Hydrogen bonding only occurs for molecules containing OH
bonds. | | |
a. | 1 only | b. | 2 only | c. | 3 only | d. | 1 and 2 | e. | 1, 2, and 3 | | |
|
|
|
2.
|
Which of the following
molecules will have the highest boiling point?
|
|
|
3.
|
Which of the following
molecules would be expected to form hydrogen bonds in the liquid or solid state: ethylene glycol
(HOCH2CH2OH), methanol (CH3OH), and formaldehyde
(H2CO)? a. | ethylene glycol
only | b. | methanol only | c. | formaldehyde only | d. | ethylene glycol and
methanol | e. | ethylene glycol, methanol, and formaldehyde | | |
|
|
|
4.
|
The normal boiling point is
defined as a. | the temperature at which the vapor pressure of a liquid equals 1
atm. | b. | the pressure at which any liquid boils at 273.15
K. | c. | the temperature at which water always boils. | d. | the pressure of a gas when its temperature reaches 373.15 K. | e. | the temperature at which the enthalpy of vaporization equals 40.7
kJ/mol. | | |
|
|
|
5.
|
Which of the following
statements are correct?
1. | Above the critical pressure, only the solid phase of a pure substance
can exist. | 2. | Above the critical temperature, a gas may not be condensed to a
liquid. | 3. | At the critical point, three phases (gas, liquid, and solid) may
coexist at equilibrium. | | |
a. | 1 only | b. | 2 only | c. | 3 only | d. | 1 and 2 | e. | 1 and 3 | | |
|
|
|
6.
|
Which of the following
statements concerning a supercritical fluid (SCF) are correct?
1. | A SCF has a viscosity similar to that of a liquid. | 2. | A SCF has a density similar to that of a gas. | 3. | A SCF fills its entire container, much like a gas. | | |
a. | 1 only | b. | 2 only | c. | 3 only | d. | 1 and 3 | e. | 1, 2, and 3 | | |
|
|
|
7.
|
Aluminum (atomic mass 26.98
g/mol) crystallizes in a face-centered cubic unit cell. In addition, aluminum has an atomic radius of
143 pm. What is the density of aluminum? a. | 1.35
g/cm3 | b. | 2.71
g/cm3 | c. | 4.98
g/cm3 | d. | 7.66
g/cm3 | e. | 10.5
g/cm3 | | |
|
|
|
8.
|
Which of the following
statements are correct? If an ionic compound with the formula MX forms a face-centered cubic lattice
with the anions (Xn-), the cations (Mn+)
will occupy
1. | all of the tetrahedral holes in each unit
cell. | 2. | all of the octahedral holes in each unit
cell. | 3. | the center of each face in each unit cell. | | |
a. | 1 only | b. | 2 only | c. | 3 only | d. | 1 and 2 | e. | 1, 2, and 3 | | |
|
|
|
9.
|
Which of the following is NOT a
network solid? a. | graphite | b. | diamond | c. | buckminster fullerene (C60) | d. | silicon dioxide | e. | elemental
silicon | | |
|
|
|
10.
|
Which of the following solids
are always amorphous: water, polyethylene, glass, potassium nitrate? a. | water and glass | b. | polyethylene and potassium
nitrate | c. | water, polyethylene, and glass | d. | water and potassium nitrate | e. | polyethylene and
glass | | |
|