Question 1

A chef in a molecular gastronomy restaurant prepares a solution by dissolving 10.0 g of NaCl in enough water to make 500 mL of solution. What is the molarity of the NaCl solution? (Molar mass of NaCl = 58.44 g/mol)

Accepted Answer

$0.342\ \mathrm{M}$

Question 2

Which of the following best describes a strong electrolyte solution?

Accepted Answer

A solution in which the solute completely dissociates into ions, conducting electricity well.

Question 3

A laboratory technician needs to prepare 250 mL of a 0.100 M HCl solution from a 2.00 M stock solution. What volume of the stock solution should be used?

Accepted Answer

$12.5\ \mathrm{mL}$

Question 4

Which of the following compounds is expected to be insoluble in water?

Accepted Answer

$\mathrm{BaSO_4}$

Question 5

When aqueous solutions of $\mathrm{AgNO_3}$ and $\mathrm{NaCl}$ are mixed, a precipitation reaction occurs. What is the net ionic equation for this reaction?

Accepted Answer

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

Question 6

A 50.0 mL sample of 0.200 M NaOH is titrated with 0.100 M HCl. What volume of HCl is required to reach the equivalence point?

Accepted Answer

$100\ \mathrm{mL}$

Question 7

Which of the following is the correct oxidation state of sulfur in $\mathrm{SO_4^{2-}}$?

Accepted Answer

$+6$

Question 8

Which of the following best explains why sugar (C$_{12}$H$_{22}$O$_{11}$) dissolves in water but does not conduct electricity?

Accepted Answer

Sugar molecules dissolve due to hydrogen bonding with water but do not dissociate into ions.

Question 9

Which of the following is the correct balanced molecular equation for the reaction between aqueous solutions of $\mathrm{BaCl_2}$ and $\mathrm{Na_2SO_4}$?

Accepted Answer

$\mathrm{BaCl_2 (aq) + Na_2SO_4 (aq) \rightarrow BaSO_4 (s) + 2NaCl (aq)}$

Question 10

A solution is prepared by diluting 20.0 mL of 3.00 M H$_2$SO$_4$ to a final volume of 250.0 mL. What is the final concentration?

Accepted Answer

$0.240\ \mathrm{M}$

Question 11

Which of the following is a correct net ionic equation for the neutralization of HCl with NaOH?

Accepted Answer

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

Question 12

Which of the following best describes the role of a spectator ion in an aqueous reaction?

Accepted Answer

It does not participate in the reaction and remains unchanged in solution.

Question 13

A redox reaction occurs between zinc metal and copper(II) sulfate solution: $\mathrm{Zn (s) + CuSO_4 (aq) \rightarrow ZnSO_4 (aq) + Cu (s)}$. Which species is oxidized?

Accepted Answer

$\mathrm{Zn}$

Question 14

Which of the following statements about the activity series is correct?

Accepted Answer

A metal higher in the activity series will displace a metal lower in the series from solution.

Question 15

Which of the following is the correct name for $\mathrm{H_2SO_3}$?

Accepted Answer

Sulfurous acid

Question 16

A solution contains 0.50 mol of glucose (C$_6$H$_{12}$O$_6$) dissolved in enough water to make 1.0 L of solution. What is the molarity of the solution?

Accepted Answer

$0.50\ \mathrm{M}$

Question 17

Which of the following best describes a gas-evolution reaction?

Accepted Answer

A reaction that produces a gas as one of the products.

Question 18

In the reaction $\mathrm{2H_2O_2 (aq) \rightarrow 2H_2O (l) + O_2 (g)}$, what is the oxidation state of oxygen in $\mathrm{H_2O_2}$ and in $\mathrm{O_2}$, respectively?

Accepted Answer

$-1$ in $\mathrm{H_2O_2}$ and $0$ in $\mathrm{O_2}$

Question 19

A 100.0 mL sample of 0.250 M Na$_2$SO$_4$ is mixed with 100.0 mL of 0.250 M BaCl$_2$. What mass of BaSO$_4$ (molar mass = 233.39 g/mol) will precipitate?

Accepted Answer

$5.83\ \mathrm{g}$

Chapter 8: Introduction to Solutions and Aqueous Reactions

Study Guide - Practice Questions

Study Guide - Flashcards