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 the reactants and products must be equal in a balanced chemical equation.

Question 2

What is the correct balanced equation for the combustion of methane ($$\mathrm{CH_4$}) in $$oxygen?

Accepted Answer

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

Question 3

Which compound is classified as a strong electrolyte when dissolved in water?

Accepted Answer

K$$_3PO$_4$$

Question 4

According to the solubility rules, which of the following compounds is insoluble in water?

Accepted Answer

AgCl

Question 5

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 6

Which of the following is the correct net ionic equation for the reaction between CaBr$$_2 (aq) $$and Na$$_3PO$_4 (aq$$)?

Accepted Answer

$$\mathrm{Ca$$^{2+}$$ (aq) + 2 PO_4$^{3-} (aq) \rightarrow Ca_3$(PO_4$)_2 (s)}$$

Question 7

Which of the following acids is classified as a weak acid?

Accepted Answer

CH$$_3$$COOH

Question 8

In the reaction $$\mathrm{CH_4$ (g) + 2 O_2$ (g) \rightarrow CO_2$ (g) + 2 H_2O (g)}$$, which species is being reduced?

Accepted Answer

O$$_2 (g)$$

Question 9

What is the oxidation state of Zn in Zn$$_3(PO$_4$$)$$_2$$?

Accepted Answer

+2

Question 10

A chemist wants to make 5.5 L of a 0.300 M CaCl$$_2$$ solution. What mass of CaCl$$_2 (110.98 g $$mol$$^{-1}) $$should the chemist use?

Accepted Answer

1.8 $$	imes$$ $$10^2$ g

Question 11

Which of the following is the correct formula for calculating molarity?

Accepted Answer

$$\mathrm{M = \frac{amount\;of\;solute\;(mol)}{volume\;of\;solution\;(L)}}$$

Question 12

If 25.0 mL of a 10.0 M H$$_2SO$_4$$ solution is diluted to obtain a 0.150 M solution, what is the final volume?

Accepted Answer

1.67 L

Question 13

Which of the following reactions is a gas-evolution reaction that produces CO$$_2 as a $$product?

Accepted Answer

$$\mathrm{2 HCl (aq) + K_2CO_3 (aq) \rightarrow 2 KCl (aq) + H_2O (l) + CO_2$ (g)}$$

Question 14

In a reaction, 12.4 mol Ti reacts with 18.8 mol Cl$$_2 to $$produce TiCl$$_4. $$What is the limiting reagent?

Accepted Answer

Ti

Question 15

What is the percent yield if the actual yield is 3 dozen cookies and the theoretical yield is 4 dozen cookies?

Accepted Answer

75%

Question 16

Which of the following is the correct equation for solution dilution?

Accepted Answer

$$\mathrm{M_1$ \cdot V_1$ = M_2$ \cdot V_2$}$$

Question 17

Which of the following is the correct balanced equation for the reaction of aluminum sulfide with water?

Accepted Answer

$$\mathrm{Al_2S_3 (s) + 6 H_2O (l) \rightarrow 2 Al(OH)_3 (aq) + 3 H_2S (g)}$$

Question 18

Which of the following is the correct definition of a reducing agent in a redox reaction?

Accepted Answer

The reactant that reduces another element and is itself oxidized.

Chemical Quantities and Aqueous Reactions: Structured Study Notes

Study Guide - Practice Questions