Question 1

Which of the following best illustrates the law of conservation of mass in a chemical reaction?

Accepted Answer

The total mass of reactants equals the total mass of products in a closed system.

Question 2

Which of the following is the correct balanced chemical equation for the combustion of propane ($$\mathrm{C_3H_8}) in $$oxygen?

Accepted Answer

$$\mathrm{C_3H_8} + 5\mathrm{O_2$} \rightarrow 3\mathrm{CO_2$} + 4\mathrm{H_2O}$$

Question 3

A sample of a compound contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is the empirical formula of the compound?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 4

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

Accepted Answer

$$\mathrm{NaCl}$$

Question 5

What is the oxidation number of sulfur in $$\mathrm{H_2SO_4}$$?

Accepted Answer

$$+6$$

Question 6

Which of the following best describes a precipitation reaction?

Accepted Answer

A reaction in which two aqueous solutions combine to form an insoluble solid.

Question 7

A solution is prepared by dissolving 5.00 g of $$\mathrm{NaCl} in $$enough water to make 250.0 mL of solution. What is the molarity of the solution? ($$\mathrm{NaCl}$$ molar mass = $$58.44\ \mathrm{g/mol})$$

Accepted Answer

$$0.342\ \mathrm{M}$$

Question 8

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

Accepted Answer

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

Question 9

Which of the following statements is true regarding strong and weak acids?

Accepted Answer

A strong acid completely ionizes in water, while a weak acid only partially ionizes.

Question 10

How many grams of $$\mathrm{CO_2$}$$ are produced when $$10.0\ \mathrm{g} of$$ $$\mathrm{C_2H_5OH} ($$ethanol, molar mass $$46.07\ \mathrm{g/mol}) is $$completely combusted? (Balanced equation: $$\mathrm{C_2H_5OH} + 3\mathrm{O_2$} \rightarrow 2\mathrm{CO_2$} + 3\mathrm{H_2O}$$, $$\mathrm{CO_2$}$$ molar mass $$44.01\ \mathrm{g/mol})$$

Accepted Answer

$$19.1\ \mathrm{g}$$

Question 11

Which of the following best describes a redox (oxidation-reduction) reaction?

Accepted Answer

A reaction in which electrons are transferred from one species to another.

Question 12

A 500.0 mL sample of 2.00 M $$\mathrm{HCl} is $$diluted to a final volume of 2.00 L. What is the final concentration?

Accepted Answer

$$0.500\ \mathrm{M}$$

Question 13

Which of the following is the correct oxidation half-reaction for the reaction of zinc metal with copper(II) sulfate solution?

Accepted Answer

$$\mathrm{Zn (s) \rightarrow Zn$$^{2+}$$ (aq) + 2e^-}$$

Question 14

Which of the following compounds is most likely to be a nonelectrolyte in water?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} ($$glucose)

Question 15

A student mixes $$50.0\ \mathrm{mL} of$$ $$0.10\ \mathrm{M}$$ $$\mathrm{$$AgNO_3$$}$$ with $$50.0\ \mathrm{mL} of$$ $$0.10\ \mathrm{M}$$ $$\mathrm{NaCl}. $$What mass of $$\mathrm{AgCl} ($$molar mass $$143.32\ \mathrm{g/mol}) $$will precipitate?

Accepted Answer

$$0.72\ \mathrm{g}$$

Question 16

Which of the following is a correct statement about the limiting reactant in a chemical reaction?

Accepted Answer

It is the reactant that is completely consumed first, thus limiting the amount of product formed.

Question 17

Which of the following is the correct net ionic equation for the neutralization of hydrochloric acid with sodium hydroxide?

Accepted Answer

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

Question 18

A sample of a compound has a molar mass of $$180\ \mathrm{g/mol}$$ and an empirical formula of $$\mathrm{CH_2O}. $$What is its molecular formula?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$}$$

Question 19

Which of the following best describes the process of dissolving an ionic compound in water?

Accepted Answer

The ions are separated and surrounded by water molecules, becoming hydrated.

General Chemistry: Chemical Reactions, Stoichiometry, and Solution Chemistry Study Guide

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