Question 1

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

Accepted Answer

Bubbles form when water is boiled.

Question 2

When hydrogen gas reacts with oxygen gas in the space shuttle’s main engines, what is the product?

Accepted Answer

Water

Question 3

Which of the following best describes a combustion reaction?

Accepted Answer

A reaction in which a substance reacts with O$$_2 to $$form one or more oxygen-containing compounds and releases heat.

Question 4

Which of the following equations is correctly balanced for the combustion of methane?

Accepted Answer

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

Question 5

Which of the following statements about aqueous NaCl is correct?

Accepted Answer

NaCl(aq) contains Na$$^+$$ and Cl$$^-$$ ions.

Question 6

According to the solubility rules, which compound is insoluble in water?

Accepted Answer

AgCl

Question 7

What is the net ionic equation for the reaction between AgNO$$_3(aq) $$and NaCl(aq)?

Accepted Answer

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

Question 8

Which of the following is a spectator ion in the reaction between AgNO$$_3(aq) $$and NaCl(aq)?

Accepted Answer

Na$$^+$$

Question 9

Which of the following best describes a precipitation reaction?

Accepted Answer

A reaction in which a solid forms from two aqueous solutions.

Question 10

What is the correct molecular equation for the reaction between potassium iodide and lead(II) nitrate in aqueous solution?

Accepted Answer

$$\mathrm{2\ KI(aq) + Pb(NO_3$)_2(aq) \rightarrow $$PbI_2$$(s) + 2\ $$KNO_3$$(aq)}$$

Question 11

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

Accepted Answer

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

Question 12

Which of the following is a correct classification for the reaction: $$\mathrm{CH_4$(g) + 2\ O_2$(g) \rightarrow CO_2$(g) + 2\ H_2O(g)}$$?

Accepted Answer

Combustion reaction

Question 13

Which of the following statements about oxidation–reduction (redox) reactions is TRUE?

Accepted Answer

Oxidation and reduction always occur together.

Question 14

A student mixes solutions of Na$$_2CO$_3(aq) $$and CuCl$$_2(aq). $$What is the balanced molecular equation for the reaction, including states?

Accepted Answer

$$\mathrm{Na_2CO_3(aq) + $$CuCl_2$$(aq) \rightarrow $$CuCO_3$$(s) + 2\ NaCl(aq)}$$

Question 15

Which of the following compounds is a strong electrolyte when dissolved in water?

Accepted Answer

NaCl

Question 16

Which of the following is the correct complete ionic equation for the reaction between AgNO$$_3(aq) $$and NaCl(aq)?

Accepted Answer

$$\mathrm{Ag^+(aq) + NO_3$^-(aq) + Na^+(aq) + Cl^-(aq) \rightarrow AgCl(s) + Na^+(aq) + NO_3$^-(aq)}$$

Question 17

Which of the following best describes a net ionic equation?

Accepted Answer

An equation showing only the species that actually participate in the reaction.

Question 18

Which of the following is a correct example of a double-displacement reaction?

Accepted Answer

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

Question 19

Which of the following is the correct net ionic equation for the neutralization of HNO$$_3(aq) $$with KOH(aq)?

Accepted Answer

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

Chemical Reactions: Evidence, Types, and Equations

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