Chemistry (Chang), 9th Edition

Chapter 12: Physical Properties of Solutions

Self Assessment A

1
Which of the following compounds would be most likely to dissolve in CCl4?
A)I2
B)H2O
C)C8H18
D)Compounds A and C
E)Compounds B and C
2
The most significant forces between solute and solvent in an aqueous ethyl alcohol (CH3CH2OH) 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 (C12H22O11) 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 (C3H7OH) 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 26oC is 25.21 torr. What is the vapor pressure of a solution that contains 16.0 g of glucose (C6H12O6) 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 (C10H8) in 300 g of cyclohexane. Pure cyclohexane freezes at 6.6oC. Kf of cyclohexane = 20.0oC/m.
A)5.21
B)-1.39
C)11.8
D)1.39
E)None of the above
8
What would be the osmotic pressure at 65oC of an aqueous solution containing 2.50 g of sucrose (C12H22O11) 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 oC. Calculate the van't Hoff factor, i, for this solution. Kf for water = 1.86oC/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
11

Calculate the molar concentration of 50.0g KNO3 dissolved in 1.50 liters of solution.
A)1.330 M
B)0.330 M
C)0.660 M
D)1.160 M
12
Which of the following is incorrectly paired?
A)Aerosol; a gas dispersed within a liquid.
B)Emulsion; liquid dispersed within another liquid.
C)Sol; solid particles in liquid.
D)Foam; liquid within a gas.
13
A hydrophilic colloid must generally be stabilized.
A)True
B)False
14
Osmosis refers to the selective passage of solvent molecules
A)through a porous membrane regardless of concentration.
B)between solutions of equal concentration.
C)from a dilute solution to a more concentrated solution.
D)from a concentrated solution to a more dilute solution.
15
What is the osmotic pressure of 0.010 M C12H22O11 at 200C ?
A)0.10 atm
B)0.24 atm
C)0.50 atm
D)0.75 atm
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