AnswersChemistryMixtures, Solutions, and Solubility

Mixtures, Solutions, and Solubility — Test Answers

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What is the relationship between the concentration of particles in a solution and the solution’s vapor pressure?

A
As solute concentration increases, vapor pressure decreases.
B
As the concentration of electrolytes increases, vapor pressure increases. However, as the concentration of nonelectrolytes increases, vapor pressure decreases.
C
As the concentration of electrolytes increases, vapor pressure decreases. However, as the concentration of nonelectrolytes increases, vapor pressure increases.
D
As solute concentration increases, vapor pressure increases.
7

Which is true about the dissolving process in water?

A
Water molecules move throughout the solute.
B
Polar solutes do not dissolve easily in water.
C
Solute molecules pull water molecules away from the surface.
D
Water molecules are attracted by solute ions at the surface of the solute.
8

Which solute, an electrolyte or a nonelectrolyte, has the greater effect on the boiling point when a given amount of each solute is dissolved in the same mass of water?

A
The nonelectrolyte does because it disperses into molecules.
B
The electrolyte does because it dissociates into ions.
C
The electrolyte does because it disperses into molecules.
D
The nonelectrolyte does because it dissociates into ions.
11

Which solution is a homogeneous mixture?

A
soil
B
sand and water
C
salad dressing
D
salt and water
13

Which substance will most likely dissociate when it is dissolved in water?

A
cap c sub 6 cap h sub 12 cap o sub 6
B
NO sub 2
C
CaCl sub 2
D
cap n sub 2 cap f sub 6
16

A number of beakers have different concentrations of a solution. Which statement best describes the most concentrated solution?

A
It has the most solute for a given volume.
B
It has the greatest amount of solute.
C
It has the most volume for a given amount of solute.
D
It has the largest volume.
17

What type of mixture scatters light and cannot be filtered easily?

A
a colloid, a homogeneous mixture
B
a solution, a homogeneous mixture
C
a colloid, a heterogeneous mixture
D
a solution, a heterogeneous mixture
18

Which factor causes a decrease in the rate of dissolution?

A
decreasing the amount of solute
B
increasing the stirring of the solution
C
increasing the temperature of the solvent
D
decreasing the surface area of the solute

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