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$$_2SO$_4 to a $$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$$_6H$_{12}O$_6) $$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$$_2SO$_4 is $$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

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