Question 1

Which of the following best describes a precipitation reaction?

Accepted Answer

A reaction in which two aqueous solutions combine to form an insoluble solid.

Question 2

Which compound will precipitate when solutions of $$\mathrm{Na_2SO_4}$$ and $$\mathrm{$$BaCl_2$$}$$ are mixed?

Accepted Answer

$$\mathrm{$$BaSO_4$$}$$

Question 3

Given the reaction: $$\mathrm{$$AgNO_3$$(aq) + NaCl(aq) \rightarrow AgCl(s) + $$NaNO_3$$(aq)}$$, which is the correct net ionic equation?

Accepted Answer

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

Question 4

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

Accepted Answer

$$\mathrm{$$PbCl_2$$}$$

Question 5

What is the oxidation number of sulfur in $$\mathrm{H_2SO_4}$$?

Accepted Answer

$$+6$$

Question 6

Which of the following reactions is a redox reaction?

Accepted Answer

$$\mathrm{Zn(s) + $$CuSO_4$$(aq) \rightarrow $$ZnSO_4$$(aq) + Cu(s)}$$

Question 7

Which of the following is the correct molecular equation for the reaction between $$\mathrm{H_2SO_4}$$ and $$\mathrm{Ba(OH)_2}$$?

Accepted Answer

$$\mathrm{H_2SO_4(aq) + Ba(OH)_2(aq) \rightarrow $$BaSO_4$$(s) + 2H_2O(l)}$$

Question 8

A student mixes $$\mathrm{K_2CO_3(aq)}$$ and $$\mathrm{$$CaCl_2$$(aq)}. $$Which of the following best describes what happens?

Accepted Answer

$$\mathrm{$$CaCO_3$$}$$ precipitates because it is insoluble.

Question 9

Which of the following is the correct net ionic equation for the neutralization of $$\mathrm{$$HNO_3$$}$$ with $$\mathrm{KOH}$$?

Accepted Answer

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

Question 10

In the reaction $$\mathrm{2Fe(s) + 3Cl_2(g) \rightarrow 2FeCl_3(s)}$$, what is the oxidation number of iron in $$\mathrm{$$FeCl_3$$}$$?

Accepted Answer

$$+3$$

Question 11

Which of the following best describes the role of spectator ions in a chemical reaction?

Accepted Answer

They do not participate in the actual chemical change.

Question 12

Which of the following is a correct classification for the reaction: $$\mathrm{2H_2O_2(aq) \rightarrow 2H_2O(l) + O_2$(g)}$$?

Accepted Answer

Decomposition reaction

Question 13

A solution contains $$\mathrm{Pb$$^{2+}$$}$$ and $$\mathrm{NO_3$^-}. $$Which reagent will cause a precipitate to form?

Accepted Answer

$$\mathrm{KCl}$$

Question 14

Which of the following is the correct ionic equation for the reaction between $$\mathrm{Na_2SO_4(aq)}$$ and $$\mathrm{$$BaCl_2$$(aq)}$$?

Accepted Answer

$$\mathrm{Ba$$^{2+}$$(aq) + SO_4$^{2-}(aq) \rightarrow $$BaSO_4$$(s)}$$

Question 15

Which of the following is NOT a redox reaction?

Accepted Answer

$$\mathrm{$$AgNO_3$$(aq) + NaCl(aq) \rightarrow AgCl(s) + $$NaNO_3$$(aq)}$$

Question 16

A patient is given a solution containing $$\mathrm{NH_4$^+}$$ and $$\mathrm{Cl^-}. $$Which compound will precipitate if $$\mathrm{$$AgNO_3$$} is $$added?

Accepted Answer

$$\mathrm{AgCl}$$

Question 17

Which of the following best describes a neutralization reaction?

Accepted Answer

A reaction in which an acid and a base react to form water and a salt.

Question 18

What is the oxidation number of chlorine in $$\mathrm{$$KClO_3$$}$$?

Accepted Answer

$$+5$$

Question 19

Which of the following reactions is best classified as a single displacement reaction?

Accepted Answer

$$\mathrm{Zn(s) + 2HCl(aq) \rightarrow $$ZnCl_2$$(aq) + H_2$(g)}$$

Question 20

Which of the following pairs of solutions will NOT produce a precipitate when mixed?

Accepted Answer

$$\mathrm{$$KNO_3$$(aq)}$$ and $$\mathrm{NaCl(aq)}$$

Chemical Reactions: Classification, Precipitation, and Redox Processes

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