Question 1

Which of the following combinations will produce a precipitate when mixed in aqueous solution?

Accepted Answer

Mixing BaCl$$_2 (aq) $$and Na$$_2SO$_4 (aq)$$

Question 2

What is the net ionic equation for the reaction between aqueous solutions of AgNO$$_3$$ and NaCl?

Accepted Answer

$$\mathrm{Ag^+ (aq) + Cl^- (aq) \rightarrow AgCl (s)}$$

Question 3

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

Accepted Answer

PbSO$$_4$$

Question 4

Which of the following is a spectator ion in the reaction: $$\mathrm{Ba(NO_3$)_2 (aq) + Na_2SO_4 (aq) \rightarrow $$BaSO_4$$ (s) + 2NaNO_3 (aq)}$$?

Accepted Answer

Na$$^+$$

Question 5

A student mixes solutions of Na$$_2CO$_3$$ and CaCl$$_2. $$What is the balanced net ionic equation for the reaction?

Accepted Answer

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

Question 6

Which of the following is a strong electrolyte?

Accepted Answer

NaOH (sodium hydroxide)

Question 7

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

Accepted Answer

HNO$$_3$$

Question 8

What is the product of the neutralization reaction between H$$_2SO$_4$$ and KOH?

Accepted Answer

K$$_2SO$_4$$ and H$$_2O$$

Question 9

Which of the following reactions will produce a gas when an acid is added to the reactant?

Accepted Answer

Na$$_2CO$_3 (aq) + 2$$HCl (aq)

Question 10

In the reaction $$\mathrm{Zn (s) + $$CuSO_4$$ (aq) \rightarrow $$ZnSO_4$$ (aq) + Cu (s)}$$, which species is oxidized?

Accepted Answer

Zn

Question 11

Assign the oxidation number to chromium in K$$_2Cr$_2O$_7.$$

Accepted Answer

+6

Question 12

Which of the following is the correct oxidation number for oxygen in H$$_2O$_2 ($$hydrogen peroxide)?

Accepted Answer

-1

Question 13

What is the sum of the oxidation numbers in the polyatomic ion SO$$_4$$^{2-}$$?

Accepted Answer

-2

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 compounds is soluble in water according to the solubility rules?

Accepted Answer

Na$$_2CO$_3$$

Question 16

A solution contains both Na$$^+$$ and NO$$_3^-. $$Which statement is true about these ions in most precipitation reactions?

Accepted Answer

They are usually spectator ions.

Question 17

Which of the following is a weak electrolyte?

Accepted Answer

NH$$_3$$

Question 18

What is the oxidation number of nitrogen in NO$$_3^-$$?

Accepted Answer

+5

Question 19

Which of the following is the correct molecular equation for the reaction between CaCO$$_3$$ and HCl?

Accepted Answer

$$\mathrm{$$CaCO_3$$ (s) + 2HCl (aq) \rightarrow $$CaCl_2$$ (aq) + CO_2$ (g) + H_2O (l)}$$

Reactions in Aqueous Solutions: Precipitation, Solubility, and Ionic Equations

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