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 of the following best describes a precipitation reaction?

Accepted Answer

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

Question 3

What is the balanced chemical equation for the combustion of methane ($$\mathrm{CH_4$}) in $$oxygen?

Accepted Answer

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

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 is a strong electrolyte?

Accepted Answer

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

Question 7

Which of the following reactions is an example of a redox reaction?

Accepted Answer

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

Question 8

Which of the following best describes a combustion reaction?

Accepted Answer

A reaction in which a substance reacts with oxygen to form one or more oxygen-containing compounds and releases heat.

Question 9

What is the correct balanced equation for the reaction of aluminum with sulfuric acid to produce 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 10

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

Accepted Answer

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

Question 11

A student mixes solutions of sodium carbonate and copper(II) chloride. Which product will precipitate?

Accepted Answer

$$\mathrm{$$CuCO_3$$}$$

Question 12

Which of the following is a double-displacement reaction?

Accepted Answer

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

Question 13

Which of the following reactions is a synthesis (combination) reaction?

Accepted Answer

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

Question 14

Which of the following is a correct molecular equation for the reaction between nitric acid and calcium hydroxide?

Accepted Answer

$$\mathrm{2HNO_3(aq) + Ca(OH)_2(aq) \rightarrow Ca(NO_3$)_2(aq) + 2H_2O(l)}$$

Question 15

Which of the following is a gas-evolution reaction that forms an unstable intermediate which decomposes to a gas?

Accepted Answer

$$\mathrm{HCl(aq) + $$NaHCO_3$$(aq) \rightarrow NaCl(aq) + H_2O(l) + CO_2$(g)}$$

Question 16

Which of the following statements about balancing chemical equations is correct?

Accepted Answer

You should only change the coefficients in front of chemical formulas to balance the equation.

Question 17

Which of the following is a single-displacement reaction?

Accepted Answer

$$\mathrm{Zn(s) + $$CuCl_2$$(aq) \rightarrow $$ZnCl_2$$(aq) + Cu(s)}$$

Chapter 7: Chemical Reactions – Study Notes for Introductory Chemistry

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