Question 1

What is the molarity of a solution prepared by dissolving

0.50

moles of

NaCl

in enough water to make

2.0

liters of solution?

Accepted Answer

Answer

Answer

Answer

Question 2

Which of the following factors generally increases the solubility of a solid solute in a liquid solvent?

Accepted Answer

Increasing the temperature of the solvent

Answer

Decreasing the surface area of the solute

Answer

Decreasing the temperature of the solvent

Answer

Increasing the partial pressure of the gas above the liquid

Question 3

Which of the following describes a solution that contains the maximum amount of dissolved solute at a specific temperature?

Accepted Answer

Saturated

Answer

Dilute

Answer

Supersaturated

Answer

Unsaturated

Question 4

Which of the following describes the phenomenon where a solution has a higher boiling point than the pure solvent?

Accepted Answer

Boiling point elevation

Answer

Osmotic pressure reduction

Answer

Vapor pressure enhancement

Answer

Freezing point depression

Question 5

How does the solubility of a gas in a liquid change as the  pressure of that gas above the liquid increases?

Accepted Answer

The solubility of the gas increases

Answer

The solubility only increases if the temperature also decreases

Answer

The solubility of the gas remains constant

Answer

The solubility of the gas decreases

Question 6

If you dissolve 20.0 g NaOH (molar mass = 40.0 g/mol) in enough water to make  0.5 L of solution; what is the molarity (M) of the solution?

Accepted Answer

1.00 M

Answer

0.04 M

Answer

2.00 M

Answer

0.50 M

Question 7

What is the volume of a solution of Ba(NO₃)₂that has a molarity of 1.2 M and contains 2.16 moles of Ba(NO₃)₂ ?

Accepted Answer

1.8 L

Answer

101 L

Answer

0.56 L

Answer

2.6 L

Question 8

Which of the following substances would have the greatest effect on the freezing point depression of

0.50

kg of water if

NaCl

mole of the substance is dissolved in it?

Accepted Answer

Answer

Answer

Answer

Question 9

Which of the following is a solution where the maximum possible amount of solute has been dissolved in a solvent at a specific temperature?

Accepted Answer

Saturated solution

Answer

Supersaturated solution

Answer

Unsaturated solution

Answer

Dilute solution

Question 10

Which of the following describes the mass percent of a solution prepared by dissolving

0.50

of sugar in

NaCl

of water?

Accepted Answer

20.0%

Answer

15.0%

Answer

25.0%

Answer

125.0%

Question 11

If the number of solute particles  in a solution is increased ; what happens to the freezing point and the boiling point of the solution?

Accepted Answer

The freezing point decreases and the boiling point increases.

Answer

The freezing point increases and the boiling point decreases.

Answer

Both the freezing point and the boiling point increase.

Answer

Both the freezing point and the boiling point decrease.

Question 12

Which of the following processes occurs when an ionic compound like NaCl dissolves in water and the ions are surrounded by water molecules?

Accepted Answer

Solvation

Answer

Sublimation

Answer

Precipitation

Answer

Condensation

Question 13

Which of the following describes the behavior of a 'supersaturated' solution?

Accepted Answer

It contains more dissolved solute than is normally possible at a given temperature.

Answer

It contains exactly the maximum amount of solute that can be dissolved.

Answer

It contains less solute than the solvent can potentially dissolve.

Answer

It is a solution that cannot conduct electricity because it lacks ions.

Question 14

A student has a solution of cesium chloride (CsCl) with a molarity of 0.25 M. How many moles of CsCl are present in 8.2 L of this solution?

Accepted Answer

2.1 mol

Answer

168. 3 mol

Answer

0.031 mol

Answer

67.3 mol

Question 15

Which of the following conditions generally increases the solubility of a gas in a liquid solvent?

Accepted Answer

Increasing the pressure and decreasing the temperature.

Answer

Decreasing the pressure and increasing the temperature.

Answer

Decreasing the pressure and decreasing the temperature.

Answer

Increasing the pressure and increasing the temperature.

Question 16

What is the mass percent of MgSO₄ in a solution if 62 grams of MgSO₄ is dissolved in 138 grams of water?

Accepted Answer

31.0 %

Answer

16.5%

Answer

72%

Answer

43.5 %

Question 17

What is the mass percent of Cal₂ in a solution if 85 grams of Cal₂ is dissolved in 315 grams of solution?

Accepted Answer

27 %

Answer

21.2 %

Answer

12. 7%

Answer

67 %

Question 18

A student is conducting an experiment to determine how different factors affect the rate at which sugar dissolves in water. They add sugar to water at room temperature and stir the solution. Which of the following changes would most effectively increase the rate at which the sugar dissolves?

Accepted Answer

Increasing the surface area

Answer

Decreasing the temperature

Answer

Increasing the volume

Answer

Stirring the solution less frequently

Question 19

A student is preparing 1.0L of a 1.0 M NaCl solution. They performed the following steps:

Step 1: Weigh 58.44 g NaCl

Step 2: Add 1.0 L of water to the 1.0 L volumetric flask

Step 3: Carefully transfer the NaCl to the 1.0 L volumetric flask

Step 4: Cap and mix thoroughly, then label: 1.0 M NaCl

Did the student correctly prepare the solution? Explain

Accepted Answer

No, step 2 is incorrect: NaCl should be added thereafter in step 3 the water should be added to the 1.0 L mark.

Answer

Yes, the steps and order are all accurate .

Answer

No, the student should have weighed 1.00g of NaCl

Answer

No, the student should have weighed 58.44 moles of NaCl

Question 20

Examine the graph; what type of solution is formed if 30 g KCl is dissolved in 100 g water at 10º?

Accepted Answer

Saturated Solution

Answer

Hypersaturated Solution

Answer

Unsaturated Solution

Answer

Supersaturated Solution

Question 21

Examine the graph; what type of solution is formed if 50 g KClO₃ is dissolved in 100 g water at 90º C?

Accepted Answer

Supersaturated Solution

Answer

Saturated Solution

Answer

Hypersaturated Solution

Answer

Unsaturated Solution

Question 22

Examine the graph; what type of solution is formed if 30 g NaCl is dissolved in 100 g water at 60º C?

Accepted Answer

Unsaturated Solution

Answer

Supersaturated Solution

Answer

Saturated Solution

Answer

Hypersaturated Solution

Question 23

How many grams of K₂Cr₂O₇ will dissolve in 100g of water at 90°C?

Accepted Answer

70.0 g

Answer

50.0 g

Answer

60.0 g

Answer

65.0 g

Question 24

How many grams of Pb(NO₃)₂will dissolve in 100g of water at 60°C?

Accepted Answer

95.0 g

Answer

90.0 g

Answer

80.0 g

Answer

85.0 g

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