Question 1

Which of the following statements best describes the role of a chemical catalyst in a reaction?

Accepted Answer

A catalyst lowers the activation energy, allowing the reaction to proceed faster.

Question 2

Given the following equilibrium: $ \mathrm{N_2O_4(g) \rightleftharpoons 2NO_2(g)} $, which of the following will increase the concentration of $ \mathrm{NO_2} $ at equilibrium?

Accepted Answer

Adding more $ \mathrm{N_2O_4} $ to the system.

Question 3

A student dissolves $ \mathrm{NaCl} $ in water. Which statement best explains why $ \mathrm{NaCl} $ is classified as a strong electrolyte?

Accepted Answer

$ \mathrm{NaCl} $ completely dissociates into $ \mathrm{Na^+} $ and $ \mathrm{Cl^-} $ ions in water.

Question 4

Which of the following solutions will conduct electricity the best?

Accepted Answer

A solution of $ \mathrm{NaCl} $ in water.

Question 5

Which of the following compounds is a weak electrolyte in aqueous solution?

Accepted Answer

$ \mathrm{CH_3COOH} $

Question 6

A solution contains $ 0.10 $ mol of $ \mathrm{Na_2SO_4} $ dissolved in $ 1.0 $ L of water. What is the total concentration of ions in the solution?

Accepted Answer

$ 0.30 \ \mathrm{mol/L} $

Question 7

Which of the following best describes the difference between a strong acid and a weak acid in water?

Accepted Answer

A strong acid completely ionizes in water, while a weak acid only partially ionizes.

Question 8

Which of the following is the correct net ionic equation for the reaction between $ \mathrm{Na_2SO_4} $ and $ \mathrm{BaCl_2} $ in aqueous solution?

Accepted Answer

$ \mathrm{Ba^{2+} (aq) + SO_4^{2-} (aq) \rightarrow BaSO_4 (s)} $

Question 9

A solution of $ \mathrm{KNO_3} $ is prepared by dissolving $ 0.50 $ mol in $ 1.0 $ L of water. What is the concentration of $ \mathrm{NO_3^-} $ ions in the solution?

Accepted Answer

$ 0.50 \ \mathrm{mol/L} $

Question 10

Which of the following best explains why $ \mathrm{C_6H_{12}O_6} $ (glucose) is a nonelectrolyte?

Accepted Answer

It dissolves in water but does not produce ions.

Question 11

If $ 0.20 $ mol of $ \mathrm{CaCl_2} $ is dissolved in $ 1.0 $ L of water, what is the concentration of $ \mathrm{Cl^-} $ ions?

Accepted Answer

$ 0.40 \ \mathrm{mol/L} $

Question 12

Which of the following is a characteristic of a weak electrolyte?

Accepted Answer

It partially dissociates into ions in solution.

Question 13

A patient is given an intravenous solution containing $ \mathrm{NaCl} $. Why is $ \mathrm{NaCl} $ chosen over $ \mathrm{C_6H_{12}O_6} $ for this purpose?

Accepted Answer

$ \mathrm{NaCl} $ is a strong electrolyte and helps maintain the body's ionic balance.

Question 14

Which of the following pairs of compounds will form a precipitate when mixed in aqueous solution?

Accepted Answer

$ \mathrm{BaCl_2} $ and $ \mathrm{Na_2SO_4} $

Question 15

Which of the following is the correct ionic equation for the dissolution of $ \mathrm{KBr} $ in water?

Accepted Answer

$ \mathrm{KBr (s) \rightarrow K^+ (aq) + Br^- (aq)} $

Question 16

A solution of $ \mathrm{CH_3COOH} $ is tested for conductivity. What result is expected and why?

Accepted Answer

Low conductivity because it is a weak electrolyte.

Question 17

Which of the following statements is true regarding the solubility of $ \mathrm{NaNO_3} $ in water?

Accepted Answer

$ \mathrm{NaNO_3} $ is a strong electrolyte and highly soluble in water.

Question 18

A chemist mixes $ \mathrm{BaCl_2} $ and $ \mathrm{Na_2SO_4} $ in water. What is the driving force for the reaction?

Accepted Answer

Formation of a precipitate ($ \mathrm{BaSO_4} $).

Study Notes: Atoms, Ions, and Isotopes

Study Guide - Practice Questions

Study Guide - Flashcards