Question 1

Which of the following best explains why NaCl dissolves readily in water?

Accepted Answer

The ion-dipole interactions between Na\^+ and Cl\^- ions and water molecules are strong enough to overcome the lattice energy of NaCl.

Question 2

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

Accepted Answer

Brass (copper and zinc)

Question 3

Why do many processes, including the formation of solutions, favor an increase in entropy?

Accepted Answer

Because systems tend to move toward greater disorder, which is thermodynamically favored.

Question 4

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

Accepted Answer

As the carbon chain length increases, the solubility of alcohols in water generally decreases.

Question 5

Which of the following best describes a saturated solution?

Accepted Answer

A solution in which the rate of dissolution equals the rate of recrystallization.

Question 6

Which of the following interactions is most important for the solubility of ethanol (CH\_3CH\_2OH) in water?

Accepted Answer

Hydrogen bonding between ethanol and water molecules.

Question 7

A student mixes two liquids and observes that they do not mix to form a homogeneous solution. Which of the following is the most likely explanation?

Accepted Answer

The intermolecular forces between the two liquids are not similar enough ('like dissolves like').

Question 8

Which of the following best describes the energy changes when a solute dissolves in a solvent?

Accepted Answer

Energy is required to separate solute and solvent particles (endothermic), and energy is released when solute and solvent interact (exothermic).

Question 9

Which of the following pairs is most likely to form a solution?

Accepted Answer

Methanol (CH\_3OH) and water (H\_2O)

Question 10

Which of the following statements about hydrogen bonding is correct?

Accepted Answer

Hydrogen bonding occurs when hydrogen is bonded to F, O, or N and interacts with another F, O, or N atom.

Question 11

A solution is prepared by dissolving CO\_2 gas in water. Which type of solution is this?

Accepted Answer

Gas solute in liquid solvent

Question 12

Which of the following best explains why oil and water do not mix?

Accepted Answer

Oil is nonpolar and water is polar, so the intermolecular forces are not compatible.

Question 13

Which of the following is true regarding the natural tendency of substances to mix?

Accepted Answer

Mixing increases entropy, which is thermodynamically favored.

Question 14

Which of the following statements about the formation of a solution is correct?

Accepted Answer

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

Question 15

Which of the following best describes a supersaturated solution?

Accepted Answer

A solution that contains more dissolved solute than it would normally hold at that temperature.

Question 16

Which of the following is a real-life example of a gas dissolved in a solid?

Accepted Answer

Hydrogen gas in palladium metal (used in hydrogen storage)

Question 17

Which of the following best explains why brass (an alloy of copper and zinc) is considered a solution?

Accepted Answer

Brass is a homogeneous mixture of two metals at the atomic level.

Question 18

Which of the following statements about the dissolution of a solid in a liquid is correct?

Accepted Answer

At equilibrium, the rate of dissolution equals the rate of recrystallization.

Question 19

Which of the following is NOT a factor that explains solubility?

Accepted Answer

The color of the solute and solvent

Question 20

Which of the following best describes the phrase 'like dissolves like'?

Accepted Answer

Polar solvents dissolve polar solutes, and nonpolar solvents dissolve nonpolar solutes.

Solutions: Types, Solubility, and Factors Affecting Solution Formation

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