Question 1

Which of the following is NOT considered evidence of a chemical reaction?

Accepted Answer

Bubbles form when water is boiled.

Question 2

Which balanced chemical equation correctly represents the combustion of methane?

Accepted Answer

$$\mathrm{CH_4$(g) + 2\ O_2$(g) \rightarrow CO_2$(g) + 2\ H_2O(g)}$$

Question 3

Laundry detergents are more effective than soap in hard water because they:

Accepted Answer

React with calcium and magnesium ions to form insoluble solids that are removed from the water.

Question 4

Which of the following compounds is insoluble in water according to the solubility rules?

Accepted Answer

$$\mathrm{AgCl}$$

Question 5

What is the net ionic equation for the reaction between aqueous solutions of silver nitrate and sodium chloride?

Accepted Answer

$$\mathrm{Ag^+(aq) + Cl^-(aq) \rightarrow AgCl(s)}$$

Question 6

Which of the following best describes a precipitation reaction?

Accepted Answer

A reaction in which a solid forms when two aqueous solutions are mixed.

Question 7

Which of the following is a correct net ionic equation for the neutralization of hydrochloric acid with sodium hydroxide?

Accepted Answer

$$\mathrm{H^+(aq) + OH^-(aq) \rightarrow H_2O(l)}$$

Question 8

Which of the following reactions is a redox (oxidation–reduction) reaction?

Accepted Answer

$$\mathrm{2Na(s) + Cl_2$(g) \rightarrow 2NaCl(s)}$$

Question 9

Which of the following is the correct classification for the reaction: $$\mathrm{2KClO_3(s) \rightarrow 2KCl(s) + 3O_2(g)}$$?

Accepted Answer

Decomposition reaction

Question 10

A student mixes solutions of potassium iodide and lead(II) nitrate. A yellow solid forms. What is the identity of the solid?

Accepted Answer

$$\mathrm{$$PbI_2$$}$$

Question 11

Which of the following best explains why pure water does not conduct electricity, but a sodium chloride solution does?

Accepted Answer

Sodium chloride solution contains ions that move freely and carry charge.

Question 12

Which of the following is a correct balanced equation for the reaction of solid aluminum with aqueous sulfuric acid to form aqueous aluminum sulfate and hydrogen gas?

Accepted Answer

$$\mathrm{2Al(s) + 3H_2SO_4(aq) \rightarrow Al_2$(SO_4$)_3(aq) + 3H_2(g)}$$

Question 13

Which of the following is a double-displacement reaction?

Accepted Answer

$$\mathrm{$$AgNO_3$$(aq) + NaCl(aq) \rightarrow AgCl(s) + $$NaNO_3$$(aq)}$$

Question 14

Which of the following statements about strong electrolytes is correct?

Accepted Answer

Strong electrolytes completely dissociate into ions in solution.

Question 15

Which of the following reactions is a gas evolution reaction?

Accepted Answer

$$\mathrm{2HCl(aq) + K_2CO_3(aq) \rightarrow 2KCl(aq) + H_2O(l) + CO_2$(g)}$$

Question 16

Which of the following is the correct molecular equation for the reaction between sodium carbonate and copper(II) chloride in aqueous solution?

Accepted Answer

$$\mathrm{Na_2CO_3(aq) + $$CuCl_2$$(aq) \rightarrow $$CuCO_3$$(s) + 2NaCl(aq)}$$

Question 17

Which of the following is a correct net ionic equation for the precipitation of lead(II) iodide from potassium iodide and lead(II) nitrate solutions?

Accepted Answer

$$\mathrm{Pb$$^{2+}$$(aq) + 2I^-(aq) \rightarrow $$PbI_2$$(s)}$$

Chapter 7: Chemical Reactions – Structured Study Notes for Introductory Chemistry

Study Guide - Practice Questions

Study Guide - Flashcards