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Chemistry, 7/e
Raymond Chang, Williams College
Intermolecular Forces and Liquids and Solids
Self Assessment A
1
Argon atoms do not combine to form species such as Ar
2
, yet argon atoms do attract one another weakly through
A)
dipole-dipole forces.
B)
dipole-induced dipole forces.
C)
ion-dipole forces.
D)
dispersion forces.
E)
hydrogen bonding.
2
Which of the following substances is not likely to exhibit hydrogen bonding?
A)
CH
3
CH
2
OH
B)
CH
3
NH
2
C)
HOCH
2
CH
2
OH
D)
(CH
3
)
3
N
E)
NH
2
OH
3
Which of the following liquids would have the highest viscosity at 25
o
C?
A)
HOCH
2
CH
2
OH
B)
CH
3
CH
2
OH
C)
CH
3
CH
2
Cl
D)
CH
3
COOCH
3
E)
CH
3
CH
2
OCH
2
CH
3
4
Lithium metal has a body-centered cubic unit cell. How many lithium atoms are there in one unit cell?
A)
1
B)
2
C)
3
D)
4
E)
8
5
Osmium tetraoxide, OsO
4
, is a molecular crystal that possess all of the following general properties except that
A)
it is a poor conductor of electricity.
B)
its crystal is soft rather than brittle.
C)
its melting point is around 40
o
C.
D)
its melting point is around 1600
o
C.
6
Which of the following substances should have the highest heat of vaporization?
A)
H
2
O
B)
H
2
S
C)
C
6
H
6
D)
CH
3
OH
E)
CH
3
OCH
3
7
Which of the following gases would have the highest critical temperature?
A)
NH
3
B)
CH
3
OH
C)
H
2
D)
C
6
H
6
E)
H
2
O
8
How much energy (heat) is required to convert 248 g of water from 0
o
C to 154
o
C? Assume that the water begins as a liquid, that the specific heat of water is 4.184 J/g.
o
C over the entire liquid range, that the specific heat of steam is 1.99 J/g.
o
C, and the heat of vaporization of water is 40.79 kJ/mol.
A)
562 kJ
B)
130 kJ
C)
692 kJ
D)
589 kJ
E)
639 kJ
9
Diethyl ether has a heat of fusion of 6.90 kJ/mol and a heat of vaporization of 26.0 kJ/mol. Estimate the heat of sublimation of diethyl ether.
A)
-32.9 kJ/mol
B)
+32.9 kJ/mol
C)
-19.1 kJ/mol
D)
+19.1 kJ/mol
E)
The heat of sublimation can't be estimated from the data given.
10
Between 20 and 80
o
C, the enthalpy of vaporization of benzene is 31.0 kJ/mol. At 26
o
C, the vapor pressure of benzene is 100 torr. Calculate the vapor pressure of benzene at 45
o
C. R = 8.314 J/K.mol.
A)
18.1 torr
B)
633 torr
C)
47.6 torr
D)
210 torr
E)
None of the above
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