Q: Which of the following best describes the process of dissociation when KCl is dissolved in water?

KCl separates into K\textsuperscript{+} and Cl\textsuperscript{–} ions, which are surrounded by water molecules.

Question 1

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

Accepted Answer

Oil molecules are nonpolar and water molecules are polar, so their intermolecular forces are not similar.

Question 2

A solution is prepared by dissolving NaCl in water. Which type of intermolecular force is primarily responsible for the dissolution process?

Accepted Answer

Ion-dipole attraction

Question 3

Which of the following best describes a saturated solution?

Accepted Answer

A solution in which the concentration of solute equals its solubility under given conditions.

Question 4

Which of the following is a correct application of the 'Golden Rule of Solubility'?

Accepted Answer

Hexane (nonpolar) will dissolve benzene (nonpolar) due to similar intermolecular forces.

Question 5

Which of the following best describes the process of dissociation when KCl is dissolved in water?

Accepted Answer

KCl separates into K	extsuperscript{+} and Cl	extsuperscript{–} ions, which are surrounded by water molecules.

Question 6

Which of the following is NOT a factor that affects the solubility of a solute in a solvent?

Accepted Answer

The color of the solute

Question 7

A 225 g sample of water is shaken with air under a pressure of 0.95 atm at 20°C. The partial pressure of Argon is 0.008873 atm and the $k_H$ of Ar is 0.060. How many milligrams of Ar will be present in the water? (Molar mass of water = 18.02 g/mol)

Accepted Answer

0.12 mg

Question 8

Which equation correctly represents Henry's Law for the solubility of a gas in a liquid?

Accepted Answer

$C_g = kP_g$

Question 9

What pressure of carbon dioxide is required to keep the carbon dioxide concentration in a bottle of club soda at 0.12 M at 25 °C? ($k_H$ for CO$_2$ at 25 °C is $3.4 	imes 10^{-2}$ M/atm)

Accepted Answer

3.53 atm

Question 10

Which of the following statements about entropy and mixing is correct?

Accepted Answer

Mixing increases the entropy of a system because energy becomes more dispersed.

Question 11

Which of the following is a strong electrolyte?

Accepted Answer

NaCl

Question 12

Which of the following best describes a supersaturated solution?

Accepted Answer

A solution in which the concentration of solute is greater than its solubility.

Question 13

Which of the following pairs of liquids are miscible?

Accepted Answer

Ethanol and water

Question 14

Why does the solubility of most gases in water decrease as temperature increases?

Accepted Answer

Increased kinetic energy allows gas particles to escape from the solution.

Question 15

Which of the following is true about the dissolution of ionic solids in water?

Accepted Answer

It is usually an endothermic process and solubility increases with temperature.

Question 16

Which intermolecular force is responsible for the high solubility of ionic compounds in water?

Accepted Answer

Ion-dipole attraction

Question 17

Which of the following would be classified as a nonelectrolyte when dissolved in water?

Accepted Answer

Sugar

Question 18

Which of the following best explains why ammonia deviates from Henry's Law when dissolved in water?

Accepted Answer

Ammonia reacts with water to form ammonium and hydroxide ions.

Question 19

Which of the following is true about the physical states of solutions?

Accepted Answer

Solutions can exist in solid, liquid, or gas phases.

Solutions and Colloids: Dissolution, Electrolytes, and Solubility

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