Question 1

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

Accepted Answer

A reaction in which two or more simple substances combine to form a more complex compound.

Question 2

Which equation represents the reaction of magnesium metal with oxygen gas?

Accepted Answer

$$2\ \mathrm{Mg}(s) + \mathrm{O}_2(g) \rightarrow 2\ \mathrm{MgO}(s)$$

Question 3

Which of the following is a decomposition reaction?

Accepted Answer

$$2\ \mathrm{H}_2O_2(l) \rightarrow 2\ \mathrm{H}_2O(l) + \mathrm{O}_2(g)$$

Question 4

Which of the following metals will NOT react with hydrochloric acid to produce hydrogen gas, based on the activity series?

Accepted Answer

Copper

Question 5

A student heats calcium carbonate ($$\mathrm{CaCO}_3) $$and observes the formation of calcium oxide and carbon dioxide. Which type of reaction is this?

Accepted Answer

Decomposition reaction

Question 6

Which of the following best describes a single-replacement reaction?

Accepted Answer

A reaction in which a more active element displaces a less active element from a compound.

Question 7

Which of the following reactions is an example of a metal reacting with water to produce a metal hydroxide and hydrogen gas?

Accepted Answer

$$2\ \mathrm{Na}(s) + 2\ \mathrm{H}_2O(l) \rightarrow 2\ \mathrm{NaOH}(aq) + \mathrm{H}_2(g)$$

Question 8

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

Accepted Answer

A more active metal can displace a less active metal from a compound.

Question 9

Sulfur reacts with oxygen to produce sulfur dioxide gas. What type of reaction is this?

Accepted Answer

Combination reaction

Question 10

Which of the following is the correct balanced equation for the decomposition of mercury(II) oxide?

Accepted Answer

$$2\ \mathrm{HgO}(s) \rightarrow 2\ \mathrm{Hg}(l) + \mathrm{O}_2(g)$$

Question 11

A strip of zinc is placed in a solution of copper(II) sulfate. Which reaction occurs?

Accepted Answer

$$\mathrm{Zn}(s) + \mathrm{CuSO}_4(aq) \rightarrow \mathrm{ZnSO}_4(aq) + \mathrm{Cu}(s)$$

Question 12

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

Accepted Answer

$$\mathrm{AgNO}_3(aq) + \mathrm{NaCl}(aq) \rightarrow \mathrm{AgCl}(s) + \mathrm{NaNO}_3(aq)$$

Question 13

Which of the following best describes what happens when lithium reacts with bromine gas?

Accepted Answer

A combination reaction forms lithium bromide.

Question 14

Which of the following is NOT a characteristic of decomposition reactions?

Accepted Answer

They always involve two reactants.

Question 15

Which of the following metals is most likely to react with water at room temperature?

Accepted Answer

Sodium

Question 16

A student mixes aqueous solutions of silver nitrate and sodium chloride. What is the precipitate formed?

Accepted Answer

$$\mathrm{AgCl}$$

Question 17

Which of the following best explains why potassium reacts vigorously with water, but copper does not?

Accepted Answer

Potassium is more active than copper.

Question 18

Which of the following is a correct example of a neutralization reaction?

Accepted Answer

$$\mathrm{HCl}(aq) + \mathrm{NaOH}(aq) \rightarrow \mathrm{NaCl}(aq) + \mathrm{H}_2O(l)$$

Classification and Types of Chemical Reactions

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