$$V_1$$ = \frac{$$C_2$$ $$V_2$$}{$$C_1$$} = \frac{0.50 \times 250}{2.0} = 62.5\ \text{mL}$$

$$\text{Mass percent} = \frac{10.0}{200.0} \times 100 = 5.0\%$$

$$M = \frac{0.5\ \text{mol}}{1.0\ \text{L}} = 0.5\ \text{M}$$

Question 1

Which of the following best describes a solution in chemistry?

Accepted Answer

A homogeneous mixture of two or more substances in a single phase

Question 2

A nurse needs to prepare 250 mL of a 0.50 M NaCl solution from a 2.0 M NaCl stock solution. What volume of the stock solution should be used?

Accepted Answer

$$V_1$$ = \frac{$$C_2$$ $$V_2$$}{$$C_1$$} = \frac{0.50 	imes 250}{2.0} = 62.5\ 	ext{mL}$$

Question 3

Which of the following compounds is most likely to be soluble in water?

Accepted Answer

NaNO$$_3$$

Question 4

A solution is prepared by dissolving 10.0 g of NaCl in enough water to make 200.0 g of solution. What is the mass percent of NaCl in the solution?

Accepted Answer

$$	ext{Mass percent} = \frac{10.0}{200.0} 	imes 100 = 5.0\%$$

Question 5

Which of the following statements about electrolytes is correct?

Accepted Answer

Strong electrolytes completely dissociate into ions in solution

Question 6

A 0.20 M solution of glucose (C$$_6H$_{12}O$_6) is $$classified as which of the following?

Accepted Answer

A nonelectrolyte solution

Question 7

Which of the following best explains why oil does not dissolve in water?

Accepted Answer

Oil is nonpolar and water is polar, so there are no favorable interactions

Question 8

A solution contains 0.5 mol of KCl dissolved in 1.0 L of water. What is the molarity of the solution?

Accepted Answer

$$M = \frac{0.5\ 	ext{mol}}{1.0\ 	ext{L}} = 0.5\ 	ext{M}$$

Question 9

Which of the following changes will increase the solubility of a gas in a liquid?

Accepted Answer

Decreasing the temperature and increasing the pressure

Question 10

A patient receives an IV solution labeled as 0.9% NaCl (w/v). What does this concentration mean?

Accepted Answer

0.9 g NaCl per 100 mL of solution

Question 11

Which of the following is an example of a supersaturated solution?

Accepted Answer

A solution that contains more solute than can normally dissolve at a given temperature

Question 12

Which of the following best describes the process of dilution?

Accepted Answer

Adding solvent to decrease the concentration of a solution

Question 13

A 100.0 mL sample of 1.50 M HCl is diluted to 300.0 mL. What is the final concentration?

Accepted Answer

$$C_1$$ $$V_1$$ = $$C_2$$ $$V_2$$ \Rightarrow $$C_2$$ = \frac{1.50 	imes 100.0}{300.0} = 0.500\ 	ext{M}$$

Question 14

Which of the following is NOT a colligative property of solutions?

Accepted Answer

Color

Question 15

A solution is prepared by mixing 25.0 g of ethanol (C$$_2H$_5OH$)$$ with 75.0 g of water. What is the mass percent of ethanol?

Accepted Answer

$$	ext{Mass percent} = \frac{25.0}{25.0 + 75.0} 	imes 100 = 25.0\%$$

Question 16

Which of the following best describes the role of water in a saltwater solution?

Accepted Answer

Water is the solvent

Question 17

Which of the following would increase the rate at which a solid solute dissolves in a solvent?

Accepted Answer

Increasing the temperature of the solvent

Question 18

A solution is labeled as 5.0% (w/v) glucose. How many grams of glucose are present in 250 mL of this solution?

Accepted Answer

$$\frac{5.0\ 	ext{g}}{100\ 	ext{mL}} 	imes 250\ 	ext{mL} = 12.5\ 	ext{g}$$

Question 19

Which of the following best describes a saturated solution?

Accepted Answer

A solution in which no more solute can dissolve at a given temperature

Chapter 9 Study Guide: Solutions

Guida di studio - Domande di pratica