Question 1

Which of the following best explains why the light bulb glows brightly when the beaker contains a solution of sodium chloride (NaCl) in water, as shown in the image?

Accepted Answer

NaCl dissociates completely in water, producing ions that carry electric current.

Question 2

According to the solubility rules, which compound is insoluble in water?

Accepted Answer

AgCl

Question 3

Which of the following is a correct net ionic equation for the reaction between zinc chloride and sodium sulfide in water?

Accepted Answer

$$\mathrm{Zn}^{2+} (aq) + S$$^{2-}$$ (aq) \rightarrow ZnS (s)$$

Question 4

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

Accepted Answer

HNO3

Question 5

Which of the following best describes the difference between the solutions shown in the two beakers (one with HCl and one with HF)?

Accepted Answer

The HCl solution contains mostly ions, while the HF solution contains mostly molecules.

Question 6

Which of the following is the correct net ionic equation for the neutralization of acetic acid (HC2H3O2) by sodium hydroxide (NaOH)?

Accepted Answer

$$\mathrm{HC}_2\mathrm{H}_3\mathrm{O}_2 (aq) + \mathrm{OH}^- (aq) \rightarrow \mathrm{C}_2\mathrm{H}_3\mathrm{O}_2^- (aq) + \mathrm{H}_2\mathrm{O} (l)$$

Question 7

Which of the following reactions will result in the formation of a gas?

Accepted Answer

$$\mathrm{Na}_2\mathrm{CO}_3 (aq) + 2\mathrm{HCl} (aq)$$

Question 8

Which of the following is a correct net ionic equation for the reaction of ammonium chloride with sodium hydroxide?

Accepted Answer

$$\mathrm{NH}_4^+ (aq) + \mathrm{OH}^- (aq) \rightarrow \mathrm{NH}_3 (g) + \mathrm{H}_2\mathrm{O} (l)$$

Question 9

Which of the following compounds is a strong base?

Accepted Answer

Ba(OH)2

Question 10

Which of the following best describes a precipitation reaction?

Accepted Answer

A reaction in which a solid forms from the mixing of two aqueous solutions.

Question 11

Which of the following is the correct net ionic equation for the reaction between barium carbonate and nitric acid?

Accepted Answer

$$\mathrm{BaCO}_3 (s) + 2\mathrm{H}^+ (aq) \rightarrow \mathrm{CO}_2 (g) + \mathrm{H}_2\mathrm{O} (l) + \mathrm{Ba}^{2+} (aq)$$

Question 12

Which of the following statements is true regarding weak electrolytes?

Accepted Answer

They conduct electricity poorly because they only partially ionize.

Question 13

Which of the following is the correct net ionic equation for the reaction of potassium sulfide with hydrochloric acid?

Accepted Answer

$$\mathrm{S}^{2-} (aq) + 2\mathrm{H}^+ (aq) \rightarrow \mathrm{H}_2\mathrm{S} (g)$$

Question 14

Which of the following best describes the role of water in the reaction $$\mathrm{NH}_3 (aq) + \mathrm{H}_2\mathrm{O} (l) \rightarrow \mathrm{NH}_4^+ (aq) + \mathrm{OH}^- (aq)$$?

Accepted Answer

Water acts as an acid, donating a proton.

Question 15

Which of the following is the correct net ionic equation for the neutralization of nitric acid by sodium hydroxide?

Accepted Answer

$$\mathrm{H}^+ (aq) + \mathrm{OH}^- (aq) \rightarrow \mathrm{H}_2\mathrm{O} (l)$$

Precipitation Reactions: Writing Molecular and Net Ionic Equations

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