Question 1

Which of the following best describes the role of a 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 2

A student mixes 0.50 mol of AgNO$$_3$$ with 0.30 mol of NaCl in water. The reaction is: $$\mathrm{$$AgNO_3$$ (aq) + NaCl (aq) \rightarrow AgCl (s) + $$NaNO_3$$ (aq)}. $$What is the limiting reactant?

Accepted Answer

NaCl

Question 3

Which of the following is the correct net ionic equation for the reaction between aqueous solutions of Na$$_2SO$_4$$ and BaCl$$_2$$?

Accepted Answer

$$\mathrm{Ba$$^{2+}$$ (aq) + SO_4$^{2-} (aq) \rightarrow $$BaSO_4$$ (s)}$$

Question 4

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

Accepted Answer

NaCl

Question 5

A solution is prepared by dissolving 5.00 g of NaOH in enough water to make 250.0 mL of solution. What is the molarity of the solution? ($$\mathrm{NaOH}$$ molar mass = 40.00 g/mol)

Accepted Answer

$$0.200\ \mathrm{M}$$

Question 6

Which of the following best describes a precipitation reaction?

Accepted Answer

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

Question 7

What is the oxidation number of sulfur in H$$_2SO$_4$$?

Accepted Answer

+6

Question 8

Which of the following statements about molarity is correct?

Accepted Answer

Molarity is defined as the number of moles of solute per liter of solution.

Question 9

A reaction has a theoretical yield of 10.0 g and an actual yield of 7.5 g. What is the percent yield?

Accepted Answer

$$75\%$$

Question 10

Which of the following is a weak electrolyte?

Accepted Answer

CH$$_3$$COOH

Question 11

Which of the following is the correct balanced molecular equation for the reaction between HCl(aq) and NaOH(aq)?

Accepted Answer

$$\mathrm{HCl (aq) + NaOH (aq) \rightarrow NaCl (aq) + H_2O (l)}$$

Question 12

A solution contains 0.10 M Na$$_2SO$_4$$ and 0.10 M Ba(NO$$_3$$)$$_2. $$What will happen when these solutions are mixed?

Accepted Answer

A precipitate of BaSO$$_4$$ will form.

Question 13

Which of the following is NOT a requirement for a solution to act as an electrolyte?

Accepted Answer

The solute must be a covalent compound.

Question 14

Which of the following best describes the use of state labels in chemical equations?

Accepted Answer

State labels indicate the physical state of each compound, such as solid, liquid, gas, or aqueous.

Question 15

A chemist needs to prepare 500.0 mL of 0.250 M KCl solution. How many grams of KCl are required? ($$\mathrm{KCl}$$ molar mass = 74.55 g/mol)

Accepted Answer

9.32 g

Question 16

Which of the following is the correct ionic equation for the reaction between Pb(NO$$_3$$)$$_2(aq) $$and KI(aq)?

Accepted Answer

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

Question 17

Which of the following is true about strong acids and bases in aqueous solution?

Accepted Answer

They completely ionize in water.

Question 18

A student is asked to write the balanced chemical equation for the combustion of methane. Which of the following is correct?

Accepted Answer

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

Question 19

Which of the following best describes a spectator ion?

Accepted Answer

An ion that remains unchanged and does not participate in the reaction.

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

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