Chemistry: Matter and Change

Section 4: Colligative Properties of Solutions

Self Check Quizzes

1
What is the name for a substance that dissolves in water but does not form ions or conduct an electric current?
A)nonelectrolyte
B)electrolyte
C)insoluble
D)saturated
2
If 4.27 g sucrose (C12H22O11) are dissolved in 15.2 g water, what is the boiling point of the resulting solution? Kb for water = 0.512°C/m.

ΔTb = Kb x m.
A)101.64°C
B)100.42°C
C)99.626°C
D)100.73°C
3
A 4.305-g sample of a nonelectrolyte is dissolved in 105 g of water. The solution freezes at -1.23°C. Calculate the molar mass of the solute. Kf for water = 1.86°C/m.

ΔTf = Kf x m.
A)39.7 g/mol
B)58.4 g/mol
C)46.2 g/mol
D)62.0 g/mol
4
If the solute in the diagram were NaCl instead of sucrose, what would be the affect on vapor pressure?

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A)The vapor pressure would be the same, because the solute does not affect colligative properties.
B)The vapor pressure would be higher, because the dissolved particles would be smaller.
C)The vapor pressure would be lower, because there would be twice as many dissolved particles.
D)The vapor pressure would be twice as much, because there would be twice as many dissolved particles.
5
Which of the liquids listed in the table will have the highest boiling point if solute is added to a concentration of 5.00 molal?

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A)water
B)benzene
C)carbon tetrachloride
D)ethanol
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