Question 1

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

Accepted Answer

Evaporation of water

Question 2

Given the chemical equation $2H_2 + O_2 \rightarrow 2H_2O$, which statement is TRUE about the law of conservation of mass?

Accepted Answer

The number and type of atoms are the same on both sides of the equation.

Question 3

What is the correct balanced equation for the reaction: $C_2H_4 + O_2 \rightarrow CO_2 + H_2O$?

Accepted Answer

$C_2H_4 + 3O_2 \rightarrow 2CO_2 + 2H_2O$

Question 4

Which type of reaction is represented by $AB \rightarrow A + B$?

Accepted Answer

Decomposition reaction

Question 5

In the reaction $Zn(s) + CuSO_4(aq) \rightarrow ZnSO_4(aq) + Cu(s)$, which element is oxidized?

Accepted Answer

Zinc

Question 6

What is the oxidation number of oxygen in $H_2O_2$?

Accepted Answer

$-1$

Question 7

Which of the following compounds is insoluble in water?

Accepted Answer

AgCl

Question 8

What is the net ionic equation for the reaction between $Pb(NO_3)_2(aq)$ and $2NaI(aq)$?

Accepted Answer

$Pb^{2+}(aq) + 2I^-(aq) \rightarrow PbI_2(s)$

Question 9

Which of the following is a combustion reaction?

Accepted Answer

$C_3H_8 + 5O_2 \rightarrow 3CO_2 + 4H_2O$

Question 10

Which statement about acids and bases in aqueous solutions is correct?

Accepted Answer

Acids produce $H^+$ ions and bases produce $OH^-$ ions in water.

Question 11

What is the product of the neutralization reaction between $HNO_3(aq)$ and $LiOH(aq)$?

Accepted Answer

$LiNO_3(aq) + H_2O(l)$

Question 12

Which of the following is a double displacement reaction?

Accepted Answer

$AB + CD \rightarrow AD + CB$

Question 13

Which of the following best describes oxidation in a redox reaction?

Accepted Answer

Loss of electrons

Question 14

If $Fe(s) + O_2(g) \rightarrow Fe_2O_3(s)$, what is the oxidation number of iron in $Fe_2O_3$?

Accepted Answer

$+3$

Question 15

Which of the following ions is most likely to be insoluble in water?

Accepted Answer

$Pb^{2+}$

Question 16

What is the complete ionic equation for the reaction: $NaOH(aq) + HCl(aq) \rightarrow NaCl(aq) + H_2O(l)$?

Accepted Answer

$Na^+(aq) + OH^-(aq) + H^+(aq) + Cl^-(aq) \rightarrow Na^+(aq) + Cl^-(aq) + H_2O(l)$

Question 17

Which of the following is a precipitation reaction?

Accepted Answer

$Pb(NO_3)_2(aq) + 2NaI(aq) \rightarrow PbI_2(s) + 2NaNO_3(aq)$

Question 18

Which of the following best explains why $AgCl$ is insoluble in water?

Accepted Answer

It forms strong ionic bonds that water cannot break.

Chemical Reactions: Classification, Equations, and Aqueous Solutions

Study Guide - Practice Questions