Question 1

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

Accepted Answer

Bubbles form when water boils.

Question 2

When balancing the combustion of methane, which of the following is the correct balanced chemical equation?

Accepted Answer

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

Question 3

Which of the following best describes a precipitation reaction?

Accepted Answer

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

Question 4

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 5

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

Accepted Answer

$$\mathrm{AgCl}$$

Question 6

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

Accepted Answer

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

Question 7

Which of the following statements about strong electrolytes is correct?

Accepted Answer

Strong electrolytes completely dissociate into ions in solution.

Question 8

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 9

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

Accepted Answer

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

Question 10

Which of the following best describes a double-displacement reaction?

Accepted Answer

Two elements or groups in two compounds exchange places to form two new compounds.

Question 11

Which of the following is a correct molecular equation for the reaction between sodium carbonate and calcium chloride in aqueous solution?

Accepted Answer

$$\mathrm{Na_2CO_3(aq) + $$CaCl_2$$(aq) \rightarrow 2NaCl(aq) + $$CaCO_3$$(s)}$$

Question 12

Which of the following is the best example of a synthesis reaction?

Accepted Answer

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

Question 13

Which of the following is a decomposition reaction?

Accepted Answer

$$\mathrm{2H_2O(l) \rightarrow 2H_2(g) + O_2$(g)}$$

Question 14

Which of the following is the correct net ionic equation for the precipitation reaction between calcium nitrate and sodium carbonate?

Accepted Answer

$$\mathrm{Ca$$^{2+}$$(aq) + CO_3$^{2-}(aq) \rightarrow $$CaCO_3$$(s)}$$

Question 15

Which of the following is a characteristic of a combustion reaction?

Accepted Answer

It always involves the reaction of a substance with oxygen.

Question 16

Which of the following is the 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 17

Which of the following is a correct statement about spectator ions?

Accepted Answer

Spectator ions are present in the same form on both sides of a complete ionic equation.

Question 18

Which of the following is a real-world example of a gas evolution reaction?

Accepted Answer

Mixing baking soda and vinegar to produce carbon dioxide bubbles.

Question 19

Which of the following best describes the process that occurs when sodium chloride dissolves in water?

Accepted Answer

Sodium and chloride ions dissociate and are surrounded by water molecules.

Chemical Reactions: Evidence, Equations, and Classifications

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