Question 1

Which of the following best explains why a sugar solution does NOT conduct electricity, as shown in the images above?

Accepted Answer

Sugar molecules dissolve as intact molecules and do not produce ions in solution.

Question 2

Which of the following equations correctly represents the dissociation of sodium sulfate in water?

Accepted Answer

$$\mathrm{Na_2SO_4(aq) \rightarrow 2Na^+(aq) + SO_4$^{2-}(aq)}$$

Question 3

Which of the following is a strong electrolyte?

Accepted Answer

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

Question 4

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

Accepted Answer

Hydrochloric acid ($$\mathrm{HCl})$$

Question 5

What is the net ionic equation for the reaction between aqueous solutions of potassium hydroxide and magnesium nitrate?

Accepted Answer

$$\mathrm{Mg$$^{2+}$$(aq) + 2OH^-(aq) \rightarrow Mg(OH)_2(s)}$$

Question 6

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

Accepted Answer

$$\mathrm{$$CaCO_3$$}$$

Question 7

A student mixes solutions of $$\mathrm{Na_2CO_3}$$ and $$\mathrm{$$CuCl_2$$}. $$Which product will precipitate?

Accepted Answer

$$\mathrm{$$CuCO_3$$}$$

Question 8

Which of the following best describes a precipitation reaction?

Accepted Answer

A reaction in which a solid forms when two aqueous solutions are mixed.

Question 9

Which of the following is the correct balanced molecular equation for the reaction between hydrochloric acid and barium hydroxide?

Accepted Answer

$$\mathrm{2HCl(aq) + Ba(OH)_2(aq) \rightarrow 2H_2O(l) + $$BaCl_2$$(aq)}$$

Question 10

A titration requires 22.87 mL of 0.158 M KOH to neutralize 20.0 mL of an H$$_2SO$_4$$ solution. What is the concentration of the H$$_2SO$_4$$ solution?

Accepted Answer

$$0.0904\ \mathrm{M}$$

Question 11

Which of the following is a redox reaction?

Accepted Answer

$$\mathrm{2Na(s) + Cl_2$(g) \rightarrow 2NaCl(s)}$$

Question 12

Assign the oxidation state to sulfur in $$\mathrm{SO_4$^{2-}}.$$

Accepted Answer

$$+6$$

Question 13

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

Accepted Answer

It loses electrons and is oxidized.

Question 14

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

Accepted Answer

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

Question 15

Which of the following reactions is a gas-evolution reaction that produces carbon dioxide?

Accepted Answer

$$\mathrm{Na_2CO_3(aq) + 2HCl(aq) \rightarrow 2NaCl(aq) + H_2O(l) + CO_2$(g)}$$

Question 16

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

Accepted Answer

It partially ionizes, producing both ions and undissociated molecules.

Question 17

Which of the following is the correct oxidation state for oxygen in $$\mathrm{K_2O_2} ($$potassium peroxide)?

Accepted Answer

$$-1$$

Question 18

Which of the following best describes a double-displacement reaction?

Accepted Answer

A reaction in which two elements or groups in different compounds exchange places.

Question 19

Which of the following is a correct statement about the solubility of ionic compounds?

Accepted Answer

Compounds containing $$\mathrm{NO_3$^-}$$ are generally soluble.

Electrolytes, Ionic Equations, and Chemical Reactions in Aqueous Solution

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