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

$$\mathrm{CaCO}_3(s) \rightarrow \mathrm{CaO}(s) + \mathrm{CO}_2(g)$$

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 mixes aqueous solutions of silver nitrate and sodium chloride. Which type of reaction occurs?

Accepted Answer

Double-replacement reaction

Question 6

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

Accepted Answer

Potassium is more active than copper in the activity series.

Question 7

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 8

Which of the following reactions is a single-replacement reaction?

Accepted Answer

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

Question 9

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

Accepted Answer

A metal and a nonmetal react to form an ionic compound.

Question 10

Which of the following is a real-life example of a decomposition reaction?

Accepted Answer

Heating calcium carbonate to produce lime for cement: $$\mathrm{CaCO}_3(s) \rightarrow \mathrm{CaO}(s) + \mathrm{CO}_2(g)$$

Question 11

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 12

Which of the following reactions is a neutralization reaction?

Accepted Answer

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

Question 13

A student observes that when a strip of zinc is placed in a solution of copper(II) sulfate, copper metal forms. Which concept explains this observation?

Accepted Answer

Zinc is more active than copper and displaces it from solution.

Question 14

Which of the following is a correct example of a combination reaction involving a nonmetal and oxygen?

Accepted Answer

$$\mathrm{S}(s) + \mathrm{O}_2(g) \rightarrow \mathrm{SO}_2(g)$$

Question 15

Which of the following best describes what happens when sodium reacts with water?

Accepted Answer

Sodium reacts with water to produce sodium hydroxide and hydrogen gas.

Question 16

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

Accepted Answer

It involves two or more reactants combining to form a single product.

Question 17

Which of the following reactions is most likely to occur based on the activity series?

Accepted Answer

$$\mathrm{Fe}(s) + \mathrm{CuSO}_4(aq) \rightarrow \mathrm{FeSO}_4(aq) + \mathrm{Cu}(s)$$

Question 18

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

Accepted Answer

A reaction in which two compounds exchange ions to form two new compounds.

Classification and Types of Chemical Reactions

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