Question 1

Which of the following best describes the law of conservation of mass as it applies to chemical reactions?

Accepted Answer

The number and kinds of atoms are the same on both sides of a balanced chemical equation.

Question 2

Given the unbalanced equation: $$\mathrm{H_2SO_4 + NaOH \rightarrow Na_2SO_4 + H_2O}$$, what are the correct coefficients to balance the equation?

Accepted Answer

$$1, 2, 1, 2$$

Question 3

Which of the following is a correct net ionic equation for the reaction between hydrochloric acid and potassium hydroxide?

Accepted Answer

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

Question 4

Which of the following best describes a precipitation reaction?

Accepted Answer

A reaction in which an insoluble solid forms when two aqueous solutions are mixed.

Question 5

In the reaction $$2\mathrm{$$NaHCO_3$$} \xrightarrow{	ext{Heat}} \mathrm{Na_2CO_3} + \mathrm{H_2O} + \mathrm{CO_2$}$$, which compound is the reactant?

Accepted Answer

$$\mathrm{$$NaHCO_3$$}$$

Question 6

Which of the following is true about oxidation and reduction in redox reactions?

Accepted Answer

Oxidation and reduction always occur together in a redox reaction.

Question 7

Assign the oxidation number to sodium in elemental sodium ($$\mathrm{Na}).$$

Accepted Answer

$$0$$

Question 8

Which of the following statements about balancing chemical equations is correct?

Accepted Answer

Coefficients are used to balance the number of atoms of each element on both sides of the equation.

Question 9

Which of the following is a spectator ion in the reaction between $$\mathrm{HCl}$$ and $$\mathrm{KOH}$$?

Accepted Answer

$$\mathrm{K^+}$$

Question 10

A student mixes solutions of $$\mathrm{Pb(NO_3$)_2}$$ and $$\mathrm{KI}$$ and observes a yellow solid forming. What type of reaction has occurred?

Accepted Answer

Precipitation reaction

Question 11

Which of the following is the correct oxidation number for oxygen in most compounds?

Accepted Answer

$$-2$$

Question 12

In the reaction $$\mathrm{Zn (s) + 2HCl (aq) \rightarrow $$ZnCl_2$$ (aq) + H_2$ (g)}$$, which substance is oxidized?

Accepted Answer

$$\mathrm{Zn}$$

Question 13

Which of the following best describes a reducing agent in a redox reaction?

Accepted Answer

It loses electrons and causes reduction.

Question 14

What is the sum of the oxidation numbers for all atoms in a neutral compound?

Accepted Answer

$$0$$

Question 15

Which of the following is the correct molecular equation for the reaction between aqueous solutions of $$\mathrm{Pb(NO_3$)_2}$$ and $$\mathrm{KI}$$?

Accepted Answer

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

Question 16

Which of the following is NOT a characteristic of an acid–base neutralization reaction?

Accepted Answer

It always produces a precipitate.

Question 17

Which of the following is the correct net ionic equation for the precipitation reaction between $$\mathrm{Pb(NO_3$)_2}$$ and $$\mathrm{KI}$$?

Accepted Answer

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

Classification and Balancing of Chemical Reactions: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards