Question 1

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

Accepted Answer

The total mass of reactants must equal the total mass of products in a chemical reaction.

Question 2

Given the unbalanced equation $$\mathrm{H_2SO_4 + NaOH \rightarrow Na_2SO_4 + H_2O}$$, what is the correct set of 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$$} \xrightarrow{	ext{Heat}} \mathrm{Na_2CO_3} + \mathrm{H_2O} + \mathrm{CO_2$}$$, what is the total number of oxygen atoms on the reactant side?

Accepted Answer

6

Question 6

Which of the following statements about oxidation and reduction is correct?

Accepted Answer

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

Question 7

Assign the oxidation number to sulfur in $$\mathrm{SO_2$}.$$

Accepted Answer

+4

Question 8

Which of the following is a correct rule for assigning oxidation numbers?

Accepted Answer

The oxidation number of an atom in its elemental state is zero.

Question 9

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

Accepted Answer

It loses electrons and is oxidized.

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 is this?

Accepted Answer

Precipitation reaction

Question 11

Which of the following is NOT a correct guideline for balancing chemical equations?

Accepted Answer

You may change the subscripts in chemical formulas to balance the equation.

Question 12

Which of the following is the correct net ionic equation for the reaction between $$\mathrm{$$AgNO_3$$}$$ and $$\mathrm{NaCl} in $$aqueous solution?

Accepted Answer

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

Question 13

Which of the following is true about spectator ions?

Accepted Answer

They do not participate in the net transformation of the reaction.

Question 14

In the reaction $$\mathrm{2Na + Cl_2$ \rightarrow 2NaCl}$$, what is the oxidation number of sodium in $$\mathrm{NaCl}$$?

Accepted Answer

+1

Question 15

Which of the following best describes an acid–base neutralization reaction?

Accepted Answer

A reaction in which $$\mathrm{H^+}$$ ions react with $$\mathrm{OH^-}$$ ions to form water.

Question 16

Which of the following is the correct balanced equation for the thermal decomposition of sodium bicarbonate ($$\mathrm{$$NaHCO_3$$}$$)?

Accepted Answer

$$2 \mathrm{$$NaHCO_3$$} \xrightarrow{	ext{Heat}} \mathrm{Na_2CO_3} + \mathrm{H_2O} + \mathrm{CO_2$}$$

Classification and Balancing of Chemical Reactions: Study Notes for GOB Chemistry

Study Guide - Practice Questions

Study Guide - Flashcards