Question 1

Which of the following best describes a synthesis (combination) reaction?

Accepted Answer

Two or more reactants combine to form a new compound.

Question 2

Which of the following is the correct balanced 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 3

A student mixes aqueous solutions of sodium chloride and silver nitrate. A white solid forms. What type of reaction is this, and what is the white solid?

Accepted Answer

Double replacement; silver chloride

Question 4

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

Accepted Answer

$$\mathrm{2KClO_3(s) \xrightarrow{\Delta} 2KCl(s) + 3O_2(g)}$$

Question 5

Which of the following statements about the activity series is TRUE?

Accepted Answer

A metal higher in the activity series loses electrons more easily than one below it.

Question 6

Which of the following is a correct example of a single replacement reaction?

Accepted Answer

$$\mathrm{2Al(s) + 3Pb(NO_3$)_2(aq) \rightarrow 3Pb(s) + 2Al(NO_3$)_3(aq)}$$

Question 7

A laboratory technician adds hydrochloric acid to sodium hydroxide, resulting in the formation of water and sodium chloride. What type of reaction is this?

Accepted Answer

Neutralization (acid-base)

Question 8

Which of the following best describes a combustion reaction?

Accepted Answer

A reaction in which a substance reacts with oxygen, often producing heat and light.

Question 9

Which of the following is the correct product when calcium oxide reacts with sulfur dioxide?

Accepted Answer

$$\mathrm{$$CaSO_3$$(s)}$$

Question 10

Which of the following reactions would NOT occur, based on the activity series?

Accepted Answer

$$\mathrm{Ag(s) + HCl(aq) \rightarrow AgCl(s) + H_2$(g)}$$

Question 11

A student heats calcium carbonate ($$\mathrm{$$CaCO_3$$}) $$and observes the formation of a white solid and a gas. Which products are formed?

Accepted Answer

$$\mathrm{CaO(s)}$$ and $$\mathrm{CO_2$(g)}$$

Question 12

Which of the following is a correct example of a double replacement reaction that produces a gas?

Accepted Answer

$$\mathrm{FeS(s) + 2HCl(aq) \rightarrow H_2S(g) + $$FeCl_2$$(aq)}$$

Question 13

Which of the following best explains why metals higher in the activity series react more readily with acids?

Accepted Answer

They lose electrons more easily.

Question 14

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

Accepted Answer

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

Question 15

A hydrocarbon fuel is burned in excess oxygen. Which products are expected?

Accepted Answer

$$\mathrm{CO_2$}$$ and $$\mathrm{H_2O}$$

Question 16

Which of the following best describes a neutralization reaction?

Accepted Answer

A reaction between an acid and a base to form water and a salt.

Question 17

Which of the following is a correct example of a decomposition reaction involving a metal hydroxide?

Accepted Answer

$$\mathrm{Ca(OH)_2(s) \xrightarrow{\Delta} CaO(s) + H_2O(g)}$$

Question 18

Which of the following is a real-world example of a double replacement reaction?

Accepted Answer

Mixing vinegar (acetic acid) and baking soda (sodium bicarbonate) to produce carbon dioxide gas.

Question 19

A student wants to produce hydrogen gas in the laboratory. Which of the following reactions would be most suitable?

Accepted Answer

$$\mathrm{2Na(s) + 2H_2O(l) \rightarrow 2NaOH(aq) + H_2$(g)}$$

Classification and Types of Chemical Reactions

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