Question 1

Which of the following best describes an aqueous solution?

Accepted Answer

A solution in which water is the solvent.

Question 2

When table salt ($$\mathrm{NaCl}) $$dissolves in water, what process occurs?

Accepted Answer

Dissociation, where $$\mathrm{Na^+}$$ and $$\mathrm{Cl^-}$$ ions are separated and surrounded by water molecules.

Question 3

Which of the following is a strong electrolyte when dissolved in water?

Accepted Answer

Sodium chloride ($$\mathrm{NaCl})$$

Question 4

Which statement correctly describes the behavior of weak electrolytes in water?

Accepted Answer

They dissociate partially, establishing an equilibrium between ions and molecules.

Question 5

A student mixes $$\mathrm{Pb}$$ and $$\mathrm{Sn} to $$make soft solder. In this mixture, what is the solvent?

Accepted Answer

$$\mathrm{Pb}$$

Question 6

Which of the following solutions will NOT conduct electricity?

Accepted Answer

A solution of sucrose ($$\mathrm{C$$_{12}$$H_{22}O$$_{11}}$) in water.

Question 7

Which process describes the surrounding of solute ions by water molecules?

Accepted Answer

Solvation

Question 8

Why is water an effective solvent for ionic compounds?

Accepted Answer

Because water has both positive (H atoms) and negative (O atom) regions that stabilize ions.

Question 9

Which of the following equations correctly represents the dissociation of sodium chloride in water?

Accepted Answer

$$\mathrm{NaCl (s) \rightarrow Na^+ (aq) + Cl^- (aq)}$$

Question 10

A solution of acetic acid ($$\mathrm{CH_3COOH}) in $$water is classified as:

Accepted Answer

A weak electrolyte

Question 11

Which of the following is a nonelectrolyte when dissolved in water?

Accepted Answer

Sucrose ($$\mathrm{C$$_{12}$$H_{22}O$$_{11}}$)

Question 12

Which of the following best explains why a solution of $$\mathrm{NaCl}$$ conducts electricity?

Accepted Answer

Because $$\mathrm{Na^+}$$ and $$\mathrm{Cl^-}$$ ions are present and mobile in solution.

Question 13

Which of the following is true about molecular compounds in water?

Accepted Answer

Most molecular compounds do NOT dissociate, but some may react with water.

Question 14

A student prepares a solution by dissolving $$\mathrm{CH_4$} in$$ $$\mathrm{N_2$}. $$What is the solvent in this solution?

Accepted Answer

$$\mathrm{N_2$}$$

Question 15

Which of the following is the correct definition of a solute?

Accepted Answer

The substance present in lesser abundance in a solution.

Question 16

Which of the following is a real-world example of a gaseous solution?

Accepted Answer

Air, with $$\mathrm{N_2$} as $$the solvent and $$\mathrm{O_2$}$$, $$\mathrm{Ar}$$, $$\mathrm{CH_4$} as $$solutes.

Question 17

Which of the following best describes the process of hydration?

Accepted Answer

The process in which water molecules arrange around an ion in solution.

Question 18

Which of the following is a multi-step process that occurs when $$\mathrm{NaCl}$$ dissolves in water?

Accepted Answer

First, $$\mathrm{NaCl}$$ dissociates into $$\mathrm{Na^+}$$ and $$\mathrm{Cl^-}$$ ions; then, water molecules surround each ion (hydration).

Question 19

Which of the following is NOT a characteristic of strong electrolytes?

Accepted Answer

They establish an equilibrium between ions and molecules.

Reactions in Aqueous Solutions: Properties, Dissolution, and Electrolytes

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