Question 1

Which of the following best describes a double replacement reaction?

Accepted Answer

A reaction where two compounds swap their cations and anions.

Question 2

Given the reaction: $$\mathrm{Na_2SO_4(aq) + $$AgNO_3$$(aq) \rightarrow $$NaNO_3$$(aq) + Ag_2SO_4(s)}$$, which product is the precipitate?

Accepted Answer

$$\mathrm{Ag_2SO_4}$$

Question 3

Which of the following is a sign that a gas evolution reaction has occurred?

Accepted Answer

Bubbles are observed during the reaction.

Question 4

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

Accepted Answer

$$+6$$

Question 5

Which of the following is the correct net ionic equation for the reaction between $$\mathrm{Mg(OH)_2(aq)}$$ and $$\mathrm{HCl(aq)}$$?

Accepted Answer

$$\mathrm{Mg(OH)_2(aq) + 2H^+(aq) \rightarrow 2H_2O(l) + Mg$$^{2+}$$(aq)}$$

Question 6

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

Accepted Answer

Zinc

Question 7

Which of the following is NOT a rule for assigning oxidation numbers?

Accepted Answer

The oxidation number of fluorine is $$+1 in $$all compounds.

Question 8

Which of the following best describes a spectator ion?

Accepted Answer

An ion that is present in the solution but does not participate in the reaction.

Question 9

A student mixes $$\mathrm{$$BaCl_2$$(aq)}$$ and $$\mathrm{Na_2SO_4(aq)}$$ and observes a white solid forming. What is the identity of the solid?

Accepted Answer

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

Question 10

Which of the following reactions is a redox reaction?

Accepted Answer

$$\mathrm{2H_2O_2(aq) \rightarrow 2H_2O(l) + O_2$(g)}$$

Question 11

In the reaction $$\mathrm{2Fe$$^{3+}$$(aq) + 2I^-(aq) \rightarrow 2Fe$$^{2+}$$(aq) + I_2$(s)}$$, which species is reduced?

Accepted Answer

$$\mathrm{Fe$$^{3+}$$}$$

Question 12

Which of the following is the correct balanced molecular equation for the reaction between $$\mathrm{$$AgNO_3$$(aq)}$$ and $$\mathrm{NaBr(aq)}$$?

Accepted Answer

$$\mathrm{$$AgNO_3$$(aq) + NaBr(aq) \rightarrow AgBr(s) + $$NaNO_3$$(aq)}$$

Question 13

Which of the following statements about oxidation-reduction reactions is correct?

Accepted Answer

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

Question 14

A gas is produced in a reaction and bubbles are observed. Which type of reaction is most likely occurring?

Accepted Answer

Gas evolution reaction

Question 15

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

Accepted Answer

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

Question 16

In the reaction $$\mathrm{2H_2O_2(aq) \rightarrow 2H_2O(l) + O_2$(g)}$$, what is the oxidation number of oxygen in $$\mathrm{H_2O_2}$$?

Accepted Answer

$$-1$$

Question 17

Which of the following is a correct statement about the sum of oxidation numbers in a polyatomic ion?

Accepted Answer

It equals the charge of the ion.

Question 18

Which of the following ions would be considered a spectator ion in the reaction $$\mathrm{$$AgNO_3$$(aq) + NaBr(aq) \rightarrow AgBr(s) + $$NaNO_3$$(aq)}$$?

Accepted Answer

$$\mathrm{Na^+}$$

Question 19

A solution contains $$\mathrm{Fe$$^{2+}$$}$$ and $$\mathrm{Fe$$^{3+}$$}. $$Which of the following statements is true regarding their oxidation states?

Accepted Answer

$$\mathrm{Fe$$^{3+}$$} is $$more oxidized than $$\mathrm{Fe$$^{2+}$$}.$$

Chemical Reactions: Double Replacement and Redox Reactions

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