MC	Chemistry	Standard: 06
Objective: 01. Describe factors that affect dissolving and how a change in concentration affects solutions.
ILO:

53 grams of salt were dissolved in a liter of water to produce a homogenous mixture. The correct identification for the solution, solvent, and solute for this process would be:

solution solvent solute

a. water salt mixture

b. mixture salt water

c. water mixture salt

d. mixture water salt

Correct Answer: d

MC	Chemistry	Standard: 06
Objective: 01. Describe factors that affect dissolving and how a change in concentration affects solutions.
ILO:

A correct method of determining the total number of moles in a solution is:

a. moles_solute + moles_solvent = moles_solution

b. moles_solute + moles_solution = moles_solvent

c. moles_solvent + moles_solute = moles_solution

d. moles_solute + moles_solution = moles_solvent

Correct Answer: a

MC	Chemistry	Standard: 06
Objective: 01. Describe factors that affect dissolving and how a change in concentration affects solutions.
ILO:

Which of the following statements makes correct use of the terms solute, solvent, and solution?

a. The solution dissolved in the solvent to produce the solvent.

b. The solvent dissolved in the solution to produce the solute.

c. The solvent dissolved in the solute to produce the solution.

d. The solute dissolved in the solvent to produce the solution.

Correct Answer: d

MC	Chemistry	Standard: 06
Objective: 01. Describe factors that affect dissolving and how a change in concentration affects solutions.
ILO:

A solution is formed by dissolving 5 grams of NH₄Cl in 100 grams of H₂O at 70¡C. Which statement correctly describes this solution?

a. NH₄Cl is the solute, and the solution is saturated.

b. NH₄Cl is the solute, and the solution is unsaturated.

c. NH₄Cl is the solvent, and the solution is saturated.

d. NH₄Cl is the solvent, and the solution is unsaturated.

Correct Answer: b

MC	Chemistry	Standard: 06
Objective: 01. Describe factors that affect dissolving and how a change in concentration affects solutions.
ILO:

A solute is added to water and a portion of the solute remains un-dissolved. When equilibrium between the dissolved and un-dissolved solute is reached, the solution must be

a. dilute

b. saturated

c. unsaturated

d. un-reactive

Correct Answer: b

MC	Chemistry	Standard: 06
Objective: 01. Describe factors that affect dissolving and how a change in concentration affects solutions.
ILO:

Given:

= particle X

= particle Y

Which diagram represents a solution in the containers of water?

a. b.

c. d.

Correct Answer: c

MC	Chemistry	Standard: 06
Objective: 01. Describe factors that affect dissolving and how a change in concentration affects solutions.
ILO:

When an equilibrium exists between the dissolved and the un-dissolved solute in a solution, the solution must be

a. diluted

b. saturated

c. reactive

d. unsaturated

Correct Answer: b

MC	Chemistry	Standard: 06
Objective: 01. Describe factors that affect dissolving and how a change in concentration affects solutions.
ILO:

What is the total number of moles of solute in 250 milliliters of a 1.0 M solution of NaCl?

a. 1.0 mole

b. 0.25 mole

c. 0.50 mole

d. 42 moles

Correct Answer: b

MC	Chemistry	Standard: 06
Objective: 01. Describe factors that affect dissolving and how a change in concentration affects solutions.
ILO:

What is the molarity of a solution that contains 0.50 mole of NaOH in 0.50 liter of solution?

a. 1.0 M

b. 2.0 M

c. 0.25 M

d. 0.50 M

Correct Answer: a

MC	Chemistry	Standard: 06
Objective: 01. Describe factors that affect dissolving and how a change in concentration affects solutions.
ILO:

What is the molarity of a solution of NaOH if 2 liters of the solution contains 4 moles of NaOH?

a. 0.5 M

b. 2 M

c. 8 M

d. 80 M

Correct Answer: b

MC	Chemistry	Standard: 06
Objective: 01. Describe factors that affect the process of dissolving and evaluate the effects that changes in concentration have on solutions.
ILO:

What is the concentration of a solution with a volume of 0.50 L that contains 40.0 grams of sodium hydroxide (NaOH)?

a. 0.10 M

b. 0.50 M

c. 1.0 M

d. 2.0 M

e. 8.0 M

Correct Answer: d

MC	Chemistry	Standard: 06
Objective: 01. Describe factors that affect the process of dissolving and evaluate the effects that changes in concentration have on solutions.
ILO:

What is the molarity of a solution made with 128 grams of magnesium chloride dissolved in one liter of water?

a. 1.34

b. 2.1

c. 3.6

d. 5.0

e. 8.1

Correct Answer: a

MC	Chemistry	Standard: 06
Objective: 01. Describe factors that affect the process of dissolving and evaluate the effects that changes in concentration have on solutions.
ILO:

1. A recipe calls for 200 grams of sugar, 2 liters of water and one package of flavoring. While gathering the ingredients, the student realizes that there is only 100 grams of sugar available. How can the student still make the drink so that it has the correct concentration?

a. all the flavoring, 100 g sugar and 1 liter of water

b. all the flavoring, 100 g sugar and 2 liters of water

c. half the flavoring, 100 g sugar and 2 liters of water

d. half the flavoring, 100 g sugar and 1 liter of water

e. half the flavoring, 50 g sugar and 1 liter of water

2. A recipe calls for 100 grams of sugar, 2 liters of water and one package of flavoring. While gathering the ingredients, the student realizes that there is only 50 grams of sugar available. How can the student still make the drink so that it has the correct concentration?

a. all the flavoring, 50 g sugar and 1 liter of water

b. all the flavoring, 50 g sugar and 2 liters of water

c. half the flavoring, 25 g sugar and 1 liter of water

d. half the flavoring, 50 g sugar and 2 liters of water

e. half the flavoring, 50 g sugar and 1 liter of water

Correct Answers:

1. d

2. e

MC	Chemistry	Standard: 06
Objective: 01. Describe factors that affect the process of dissolving and evaluate the effects that changes in concentration have on solutions.
ILO:

1. Which of the following concentrations has units of moles of solute per liters of solution?

a. molarity

b. mass percent

c. parts per million

d. mole fraction

e. normality

2. Which of the following concentrations has units of moles of solute per of kilogram of solvent?

a. molarity

b. molality

c. parts per million

d. mole fraction

e. normality

Correct Answers:

1. a

2. b

MC	Chemistry	Standard: 06
Objective: 01. Describe factors that affect the process of dissolving and evaluate the effects that changes in concentration have on solutions.
ILO:

1. How many moles of solute does one liter of a 6 molar (6M) solution of sucrose (C₆H₁₂0₆) contain?

a. 432 moles

b. 144 moles

c. 24 moles

d. 30 moles

e. 6 moles

2. What is the molarity of a sugar solution that contains 36.0 grams of glucose (C6H1206) are placed in a 2 liter volumetric flask that is filled to the 2 liter line with distilled water?

a. 36.0 molar

b. 18.0 molar

c. 9.0 molar

d. 0. 1 molar

e. 0.05 molar

3. What is the molarity of a salt solution that is made from 31.0 grams of Ca₃(P0₄)₂ placed in a volumetric flask and filled to the 2 liter line with distilled water?

a. 0.0250 M

b. 0.0500 M

c. 0.100 M

d. 15.5M

e. 31.O M

Correct Answers:

1. e

2. d

3. b

MC	Chemistry	Standard: 06
Objective: 01. Describe factors that affect the process of dissolving and evaluate the effects that changes in concentration have on solutions.
ILO:

1. Which of the following solute/solvent combinations would represent the most concentrated solution?

a. low amounts of solute to high amounts of solvent

b. moderate amounts of solute to moderate amounts of solvent

c. high amounts of solute to low amounts of solvent

d. low amounts of solute to moderate amounts of solvent

e. moderate amount of solute to high amounts of solvent

2. Which of the following solute/solvent combinations would represent the most dilute solution?

a. low amounts of solute to high amounts of solvent

b. moderate amounts of solute to moderate amounts of solvent

c. high amounts of solute to low amounts of solvent

d. low amounts of solute to moderate amounts of solvent

e. moderate amounts of solute to high amounts of solvent

Correct Answers:

1. c

2. a

MC	Chemistry	Standard: 06
Objective: 01. Describe factors that affect the process of dissolving and evaluate the effects that changes in concentration have on solutions.
ILO:

A blood level of 0.1 ppm of lead is known to affect intelligence levels in human beings. Blood levels of 0.8 ppm of lead, or higher, can lead to coma or possible death. At which of the following lead levels would you have the most reason to be concerned about survival?

a. 1.0 ppm

b. 0.1 ppm

c. 0.01 ppm

d. 0.001 ppm

Correct Answer: a

MC	Chemistry	Standard: 06
Objective: 01. Describe factors that affect the process of dissolving and evaluate the effects that changes in concentration have on solutions.
ILO:

A blood level of 0.1 ppm of lead is known to affect intelligence levels in human beings. How many grams of lead would need to accumulate in a 1000 grams of blood in order to affect human intelligence?

a. 100 grams of lead per 100 grams of blood

b. 10 grams of lead per 100 grams of blood

c. 0.1 grams of lead per 100 grams of blood

d. 0.0001 grams of lead per 100 grams of blood

Correct Answer: d

MC	Chemistry	Standard: 06
Objective: 01. Describe factors that affect the process of dissolving and evaluate the effects that changes in concentration have on solutions.
ILO:

Some chemicals are critical at very low concentrations. Which of the following units would be most appropriate for recording these low concentrations?

a. molarity (moles/liter)

b. molality (moles/kilogram)

c. mole fraction (moles/total moles)

d. ppm (parts per million)

Correct Answer: d