Question 1

Which of the following best explains why seawater is considered a solution?

Accepted Answer

It is a homogeneous mixture of water (solvent) and dissolved salts (solutes).

Question 2

When the barrier between pure water and a sodium chloride solution is removed, what drives the spontaneous mixing of the two solutions?

Accepted Answer

The tendency toward uniform mixing and increased entropy.

Question 3

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

Accepted Answer

Brass (copper and zinc)

Question 4

In the context of intermolecular forces, which interaction is primarily responsible for the solubility of NaCl in water?

Accepted Answer

Ion-dipole interactions

Question 5

Why do neon and argon gases spontaneously mix when the barrier between them is removed?

Accepted Answer

Because mixing increases the system's entropy.

Question 6

Which of the following statements about solution interactions is correct?

Accepted Answer

A solution forms when solvent-solute interactions are greater than or equal to the sum of solvent-solvent and solute-solute interactions.

Question 7

Hexane and water do not mix to form a solution. Which principle best explains this observation?

Accepted Answer

"Like dissolves like"; hexane is nonpolar and water is polar.

Question 8

Which of the following solvents would best dissolve a nonpolar solute such as iodine (I2)?

Accepted Answer

Hexane (C6H14)

Question 9

Which alcohol would you expect to be least soluble in water based on the data provided?

Accepted Answer

Pentanol

Question 10

Which step in the solution formation process is always endothermic?

Accepted Answer

Separating solute particles ($$\Delta H_{solute})$$

Question 11

Given the following data for KCl: $$\Delta H_{solution} = +17 kJ/$$mol and $$\Delta H_{hydration} = -684 kJ/$$mol, what is the value of $$\Delta H_{solute}$$?

Accepted Answer

$$+701 kJ/$$mol

Question 12

Which of the following best describes the process of dynamic equilibrium in a saturated solution?

Accepted Answer

The rate of dissolution equals the rate of recrystallization.

Question 13

A solution is prepared by dissolving 25 g of KClO$$_3 in 100 g of $$water at 90$$^	ext{o}C. $$According to the solubility curve, is the solution saturated, unsaturated, or supersaturated at this temperature?

Accepted Answer

Unsaturated

Question 14

Which of the following statements about the solubility of gases in water is correct?

Accepted Answer

The solubility of gases decreases with increasing temperature.

Question 15

According to Henry’s Law, which equation correctly relates the solubility of a gas to its partial pressure?

Accepted Answer

$$S_{gas} = k_H P_{gas}$$

Question 16

Which of the following best explains why opening a can of soda causes bubbles to form?

Accepted Answer

The pressure above the solution decreases, reducing the solubility of CO$$_2.$$

Question 17

Which of the following is NOT a colligative property?

Accepted Answer

Color change

Question 18

Which equation correctly expresses Raoult’s Law for a solution containing a nonvolatile solute?

Accepted Answer

$$P_{solution} = \chi_{solvent} P$$^{\circ}$$_{solvent}$$

Question 19

A solution is made by dissolving 16.7 g of calcium nitrate in 50.0 mL of water at 55$$^	ext{o}C. If $$the vapor pressure of pure water at this temperature is 118.1 torr, what is the effect on the vapor pressure above the solution?

Accepted Answer

The vapor pressure decreases.

Question 20

Which of the following best describes the Tyndall effect?

Accepted Answer

The scattering of light by colloidal particles.

Chapter 14: Solutions – Structure, Properties, and Formation

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