Question 1

Which of the following best describes a precipitation reaction?

Accepted Answer

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

Question 2

Which compound will form a precipitate when aqueous solutions of Na2SO4 and BaCl2 are mixed?

Accepted Answer

$$\mathrm{$$BaSO_4$$}$$

Question 3

Which of the following is a strong electrolyte?

Accepted Answer

$$\mathrm{NaCl} (aq)$$

Question 4

What is the net ionic equation for the reaction between aqueous solutions of AgNO3 and NaCl?

Accepted Answer

$$\mathrm{Ag^+ (aq) + Cl^- (aq) \rightarrow AgCl (s)}$$

Question 5

Which of the following compounds is insoluble in water?

Accepted Answer

$$\mathrm{$$PbCl_2$$}$$

Question 6

Which of the following best describes a combustion reaction?

Accepted Answer

A reaction in which a substance reacts with oxygen, emits heat, and forms one or more oxygen-containing compounds.

Question 7

Which of the following is a double-displacement reaction?

Accepted Answer

$$\mathrm{AB + CD \rightarrow AD + CB}$$

Question 8

Which of the following statements about redox reactions is correct?

Accepted Answer

Oxidation is the loss of electrons, and reduction is the gain of electrons.

Question 9

A student mixes solutions of Na2CO3 and CaCl2. Which product will precipitate?

Accepted Answer

$$\mathrm{$$CaCO_3$$}$$

Question 10

Which of the following is a weak electrolyte?

Accepted Answer

$$\mathrm{CH_3COOH} (aq)$$

Question 11

Which of the following best describes a synthesis reaction?

Accepted Answer

Two or more simple substances combine to form a more complex substance.

Question 12

Which of the following is the correct balanced equation for the combustion of methane ($$\mathrm{CH_4$}$$)?

Accepted Answer

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

Question 13

Which of the following ions is a spectator ion in the reaction between Na2SO4 and BaCl2?

Accepted Answer

$$\mathrm{Na^+}$$

Question 14

Which of the following compounds is soluble in water?

Accepted Answer

$$\mathrm{$$KNO_3$$}$$

Question 15

A solution of HCl is mixed with a solution of NaOH. What type of reaction occurs?

Accepted Answer

Acid–base reaction

Question 16

Which of the following best describes a decomposition reaction?

Accepted Answer

A complex substance breaks down into simpler substances.

Question 17

Which of the following is the correct net ionic equation for the reaction between HCl(aq) and NaOH(aq)?

Accepted Answer

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

Question 18

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

Accepted Answer

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

Question 19

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

Accepted Answer

One element displaces another in a compound.

Chemical Reactions and Stoichiometry: Study Guide for Introductory Chemistry

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