Question 1

Which of the following best explains why sodium chloride (NaCl) dissolves in water?

Accepted Answer

The attraction between the Na+ and Cl− ions and the polar water molecules is strong enough to overcome the ionic bonds in NaCl.

Question 2

Which of the following solutions will conduct electricity the best?

Accepted Answer

A 1.0 M solution of KBr

Question 3

Which of the following best describes the charge distribution in a water molecule?

Accepted Answer

The oxygen atom has a partial negative charge and the hydrogen atoms have partial positive charges.

Question 4

Which of the following compounds is always soluble in water, according to the solubility rules?

Accepted Answer

$$\mathrm{NO_3$^-}$$

Question 5

A student mixes solutions of $$\mathrm{Pb(NO_3$)_2}$$ and $$\mathrm{KI}. $$What is the precipitate formed, if any?

Accepted Answer

$$\mathrm{$$PbI_2$$}$$

Question 6

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

Accepted Answer

$$\mathrm{NaCl}$$

Question 7

Which of the following best describes a nonelectrolyte solution?

Accepted Answer

A solution that contains only molecules and does not conduct electricity.

Question 8

Which of the following is the 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 ions is a spectator ion in the complete ionic equation for the reaction between $$\mathrm{$$AgNO_3$$}$$ and $$\mathrm{NaCl}$$?

Accepted Answer

$$\mathrm{NO_3$^-}$$

Question 10

Which of the following best explains why a solution of acetic acid ($$\mathrm{HC_2H_3O_2}) $$conducts electricity poorly?

Accepted Answer

Acetic acid is a weak acid and only partially ionizes in water.

Question 11

Which of the following compounds is insoluble in water?

Accepted Answer

$$\mathrm{AgCl}$$

Question 12

A solution of $$\mathrm{HCl} in $$water is classified as which of the following?

Accepted Answer

A strong electrolyte

Question 13

Which of the following best describes the process of precipitation in a chemical reaction?

Accepted Answer

A solid forms when two solutions are mixed.

Question 14

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

Accepted Answer

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

Question 15

Which of the following best describes a net ionic equation?

Accepted Answer

An equation showing only the species that actually change during the reaction.

Question 16

A student mixes solutions of $$\mathrm{Na_2SO_4}$$ and $$\mathrm{$$LiNO_3$$}. $$What is the result?

Accepted Answer

No reaction occurs because all possible products are soluble.

Question 17

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

Accepted Answer

Sugar molecules dissolve as intact molecules and do not form ions.

Question 18

Which of the following is a correct complete ionic equation for the reaction between $$\mathrm{Na_2CO_3}$$ and $$\mathrm{$$CaCl_2$$} in $$aqueous solution?

Accepted Answer

$$\mathrm{2Na^+ (aq) + CO_3$^{2-} (aq) + Ca$$^{2+}$$ (aq) + 2Cl^- (aq) \rightarrow $$CaCO_3$$ (s) + 2Na^+ (aq) + 2Cl^- (aq)}$$

Question 19

Which of the following best describes a strong acid in aqueous solution?

Accepted Answer

It completely ionizes in water.

Introduction to Solutions and Aqueous Reactions (Sections 5.4–5.6)

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