Chemistry: Matter and Change

Chapter 14: Mixtures and Solutions

Chapter Test Practice

1
In the diagram, the large spheres represent the colloid particles. What do the small spheres represent?

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A)electrons
B)the dispersing medium particles
C)protons
D)the thixotropic particles
2
What is the solvent in the solution we call air?
A)oxygen
B)carbon dioxide
C)nitrogen
D)water vapor
3
What is the mole fraction of ethanol (C2H5OH) in a solution of 47.5 g of ethanol in 850 g of water?
A)0.021
B)0.18
C)3.032
D)0.98
4
What is the molality of HCl in an aqueous solution in which the mole fraction of HCl is 0.220?

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A)15m
B)282m
C)30.9m
D)15.7m
5
What is the molarity of a 50.0 ml solution containing 10.0 grams of table sugar (C12H22O11)?

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A)0.000584 M
B)2.00 M
C)0.584 M
D)200 M
6
At constant temperature, the pressure of carbon dioxide over water increases from 1.00 atm to 3.00 atm. If the beginning solubility is 0.878 g/100 L water, what is the final solubility

S1/P1 = S2/P2
A)0.878 g/100 L water
B)3.51 g/100 L water
C)0.293 g/100 L water
D)2.63 g/100 L water
7
Sucrose dissolves in water because __________.

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A)sucrose is an ionic compound
B)both water and sucrose are polar molecules
C)both water and sucrose are molecular compounds
D)both water and sucrose have high melting points
8
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
9
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.
10
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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