Question 1

Which of the following solutions will conduct electricity most effectively?

Accepted Answer

A solution of sodium chloride, $$\mathrm{NaCl}$$, in water

Question 2

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

Accepted Answer

$$\mathrm{NaCl} ($$sodium chloride)

Question 3

Which of the following acids is classified as a strong acid?

Accepted Answer

Hydrochloric acid, $$\mathrm{HCl}$$

Question 4

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

Accepted Answer

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

Question 5

What is the net ionic equation for the reaction between $$\mathrm{Pb(NO_3$)_2}$$ and $$\mathrm{KI} in $$aqueous solution?

Accepted Answer

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

Question 6

Which of the following statements about oxidation and reduction is correct?

Accepted Answer

Oxidation is the loss of electrons and reduction is the gain of electrons.

Question 7

In the reaction $$\mathrm{Zn(s) + 2H^+(aq) \rightarrow Zn$$^{2+}$$(aq) + H_2$(g)}$$, which species is oxidized?

Accepted Answer

$$\mathrm{Zn}$$

Question 8

What is the oxidation number of sulfur in $$\mathrm{SO_4$^{2-}}$$?

Accepted Answer

$$+6$$

Question 9

Which of the following is a correct statement about the dilution of a solution?

Accepted Answer

The number of moles of solute remains unchanged.

Question 10

A student dissolves $$7.2 g of$$ $$\mathrm{$$CaCl_2$$} in$$ $$60 mL of $$water. What is the molarity of the $$\mathrm{$$CaCl_2$$}$$ solution? (Molar mass of $$\mathrm{$$CaCl_2$$} is$$ $$111 g/$$mol)

Accepted Answer

$$1.08 M$$

Question 11

Which of the following best describes the role of an oxidizing agent in a redox reaction?

Accepted Answer

It is reduced and gains electrons.

Question 12

Which of the following compounds will form a precipitate when mixed with $$\mathrm{Pb(NO_3$)_2} in $$aqueous solution?

Accepted Answer

$$\mathrm{KI}$$

Question 13

What is the concentration of $$\mathrm{NaOH}$$ solution if $$45.7 mL of$$ $$0.500 M$$ $$\mathrm{H_2SO_4} is $$required to neutralize $$20.0 mL of$$ $$\mathrm{NaOH}$$ solution? (Balanced equation: $$\mathrm{H_2SO_4 + 2NaOH \rightarrow 2H_2O + Na_2SO_4})$$

Accepted Answer

$$1.14 M$$

Question 14

Which of the following best explains why $$\mathrm{NaCl}$$ solution conducts electricity but $$\mathrm{C$$_{12}$$H_{22}O$$_{11}}$ (sucrose) solution does not?

Accepted Answer

$$\mathrm{NaCl}$$ forms ions in solution, while sucrose does not.

Question 15

Which of the following is a weak electrolyte?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 16

Which of the following best describes the process of rusting as seen on a ship's hull?

Accepted Answer

It is an oxidation-reduction reaction where iron is oxidized.

Question 17

What is the oxidation number of oxygen in $$\mathrm{H_2O_2} ($$hydrogen peroxide)?

Accepted Answer

$$-1$$

Question 18

Which of the following compounds is soluble in water with no important exceptions?

Accepted Answer

$$\mathrm{$$NaNO_3$$}$$

Question 19

Which of the following best describes the change in oxidation number for magnesium in the reaction $$\mathrm{Mg(s) + 2HCl(aq) \rightarrow $$MgCl_2$$(aq) + H_2$(g)}$$?

Accepted Answer

It increases from $$0 to$$ $$+2.$$

Aqueous Reactions: Electrolytes, Precipitation, Redox, and Solution Concentration

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