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Chemistry, 7/e
Raymond Chang, Williams College
Physical Properties of Solutions
Self Assessment A
1
Which of the following compounds would be most likely to dissolve in CCl
4
?
A)
I
2
.
B)
H
2
O
C)
C
8
H
18
D)
Compounds A and C
E)
Compounds B and C
2
The most significant forces between solute and solvent in an aqueous ethyl alcohol (CH
3
CH
2
OH) solution are
A)
charge-charge interactions.
B)
charge-dipole interactions
C)
dispersion forces
D)
hydrogen bonding
3
What is the molality of a solution composed of 38.0 g of cane sugar (C
12
H
22
O
11
) dissolved in 175 g of water?
A)
0.514 mol/kg
B)
635.0 mol/kg
C)
0.217 mol/kg
D)
0.635 mol/kg
E)
217 mol/kg
4
A sample of rubbing alcohol contains 142.0 g of isopropanol (C
3
H
7
OH) and 58.0 g of water. The mole fractions of alcohol and water are
A)
2.36 and 3.22
B)
0.423 and 0.577
C)
0.236 and 0.322
D)
0.577 and 0.423
E)
0.733 and 1.324
5
The solubility of a gas in water generally ________ with increasing pressure.
A)
increases
B)
decreases
C)
remains the same
D)
In order to answer the question, one must know the identity of the gas in question.
6
The vapor pressure of pure water at 26
o
C is 25.21 torr. What is the vapor pressure of a solution that contains 16.0 g of glucose (C
6
H
12
O
6
) dissolved in 80 g of water?
A)
16.8 torr
B)
24.7 torr
C)
0.49 torr
D)
25.4 torr
E)
14.1 torr
7
Calculate the approximate freezing point of a solution prepared by dissolving 10.0 g of naphthalene (C
10
H
8
) in 300 g of cyclohexane. Pure cyclohexane freezes at 6.6
o
C. K
f
of cyclohexane = 20.0
o
C/m.
A)
5.21
B)
-1.4
C)
11.8
D)
1.4
E)
None of the above
8
What would be the osmotic pressure at 65.0
o
C of an aqueous solution containing 2.50 g of sucrose (C
12
H
22
O
11
) per 205 mL of solution?
A)
0.989 atm
B)
0.192 atm
C)
0.812 atm
D)
0.338 atm
E)
1.450 atm
9
The freezing point of a solution prepared by dissolving 17.0 g of KCl in 150 g of water is -4.70
o
C. Calculate the van't Hoff factor, i, for this solution. K
f
for water = 1.86
o
C/m.
A)
1.86
B)
2.52
C)
1.66
D)
1.52
E)
None of the above
10
__________ colloids are solutions containing extremely large molecules such as proteins. These colloids are also termed "water loving".
A)
hydrophobic
B)
aerosol
C)
hydrophilic
D)
emulsion
E)
solid sol
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