Question 1

Which of the following best explains why a sodium chloride solution conducts electricity, while pure water and a sucrose solution do not?

Accepted Answer

NaCl dissociates into ions in water, providing charged particles that carry current.

Question 2

When NaCl dissolves in water, what happens at the molecular level?

Accepted Answer

Na+ and Cl- ions are separated and surrounded by water molecules, preventing recombination.

Question 3

Which of the following compounds is a strong electrolyte in aqueous solution?

Accepted Answer

NaCl

Question 4

Which of the following best describes the difference between ionic and molecular compounds in water?

Accepted Answer

Ionic compounds dissociate into ions, while molecular compounds usually remain as intact molecules.

Question 5

Which of the following is a net ionic equation for the reaction between Pb(NO3)2(aq) and 2 KI(aq)?

Accepted Answer

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

Question 6

Which of the following compounds is predicted to be insoluble in water according to the solubility guidelines?

Accepted Answer

BaCO3

Question 7

A solution is prepared by dissolving 21.0 g of NaF in enough water to make 500. mL of solution. What is the molarity of the solution? (Molar mass of NaF = 42.0 g/mol)

Accepted Answer

$$\mathrm{1.00\ M}$$

Question 8

Which of the following is a correct balanced molecular equation for the reaction of Ca(OH)2 with HNO3?

Accepted Answer

$$\mathrm{Ca(OH)_2 (s) + 2 $$HNO_3$$ (aq) \rightarrow Ca(NO_3$)_2 (aq) + 2 H_2O (l)}$$

Question 9

How many milliliters of 3.0 M H2SO4 solution are needed to make 450. mL of 0.10 M H2SO4?

Accepted Answer

$$\mathrm{15\ mL}$$

Question 10

Which of the following is a strong acid?

Accepted Answer

HClO4

Question 11

A solution contains either KCl or BaCl2. Which reagent could be used to distinguish between them by forming a precipitate with only one of the cations?

Accepted Answer

Li2SO4

Question 12

Which of the following is the correct net ionic equation for the reaction of HCl(aq) with NaOH(aq)?

Accepted Answer

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

Question 13

Which of the following statements about strong and weak electrolytes is correct?

Accepted Answer

Strong electrolytes completely ionize in solution, while weak electrolytes only partially ionize.

Question 14

What is the total ion concentration in a 1.0 M Na2SO4 solution?

Accepted Answer

$$\mathrm{3.0\ M}$$

Question 15

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 16

Which of the following is a correct net ionic equation for the reaction between Na2CO3(aq) and AgNO3(aq)?

Accepted Answer

$$\mathrm{2 Ag^+ (aq) + CO_3$^{2-} (aq) \rightarrow Ag_2CO_3 (s)}$$

Question 17

A solution is 0.030 M in K+ ions. What is the molar concentration of the potassium carbonate solution, K2CO3?

Accepted Answer

$$\mathrm{0.015\ M}$$

Question 18

Which of the following best describes the role of water molecules in the dissolution of ionic compounds?

Accepted Answer

Water molecules surround and stabilize the separated ions, preventing them from recombining.

Question 19

How many grams of Ca(OH)2 are needed to neutralize 25.0 mL of 0.100 M HNO3? (Molar mass of Ca(OH)2 = 74.10 g/mol)

Accepted Answer

$$\mathrm{0.0927\ g}$$

Chapter 4 Chemistry

Study Guide - Practice Questions

Study Guide - Flashcards