Question 1

Which of the following best describes the process occurring when an iron nail is placed in a copper(II) sulfate solution, as shown in the first image?

Accepted Answer

Iron is oxidized and copper is reduced, resulting in copper plating onto the nail.

Question 2

In the reaction $\mathrm{Fe(s) + Cu^{2+}(aq) \rightarrow Fe^{2+}(aq) + Cu(s)}$, which species acts as the oxidizing agent?

Accepted Answer

Cu^{2+}(aq)

Question 3

What is the oxidation number of manganese in potassium permanganate ($\mathrm{KMnO_4}$)?

Accepted Answer

$+7$

Question 4

Which of the following reactions is a combination reaction?

Accepted Answer

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

Question 5

According to the activity series shown, which metal will NOT react with acids to produce hydrogen gas?

Accepted Answer

Copper

Question 6

In a voltaic cell constructed with zinc and copper electrodes, which electrode is the anode and what reaction occurs there?

Accepted Answer

Zinc electrode; $\mathrm{Zn(s) \rightarrow Zn^{2+}(aq) + 2e^-}$

Question 7

What is the primary function of the salt bridge in a voltaic cell?

Accepted Answer

To maintain charge balance by allowing ions to flow between the half-cells.

Question 8

Which of the following correctly identifies the direction of electron flow in a voltaic cell with zinc and copper electrodes?

Accepted Answer

From the zinc electrode to the copper electrode

Question 9

In the reaction $\mathrm{Zn(s) + Cu^{2+}(aq) \rightarrow Zn^{2+}(aq) + Cu(s)}$, which species is reduced?

Accepted Answer

Cu^{2+}(aq)

Question 10

Which of the following is a correct half-reaction for the reduction process in the iron-copper redox reaction?

Accepted Answer

$\mathrm{Cu^{2+}(aq) + 2e^- \rightarrow Cu(s)}$

Question 11

Which statement about the anode in a voltaic cell is correct?

Accepted Answer

It is where oxidation occurs and has a negative sign.

Question 12

A student mixes zinc metal with hydrochloric acid. According to the activity series, what will happen?

Accepted Answer

Zinc will react with acid to produce hydrogen gas.

Question 13

Which of the following is NOT an oxidation-reduction reaction?

Accepted Answer

$\mathrm{Mg_3N_2(s) + 6H_2O(l) \rightarrow 3Mg(OH)_2(s) + 2NH_3(g)}$

Question 14

In the reaction $\mathrm{Zn(s) + 2Ag^+(aq) \rightarrow Zn^{2+}(aq) + 2Ag(s)}$, what is the correct balanced oxidation half-reaction?

Accepted Answer

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

Question 15

Which of the following best explains why the salt bridge is necessary in a voltaic cell?

Accepted Answer

It prevents the buildup of charge by allowing ions to flow, maintaining electroneutrality.

Question 16

In the reaction $\mathrm{2Na(s) + Cl_2(g) \rightarrow 2NaCl(s)}$, which element is oxidized?

Accepted Answer

Na

Question 17

Which of the following is a correct description of a displacement reaction?

Accepted Answer

An element reacts with a compound, displacing another element from it.

Question 18

What is the correct net ionic equation for the reaction between iron and copper(II) sulfate solution?

Accepted Answer

$\mathrm{Fe(s) + Cu^{2+}(aq) \rightarrow Fe^{2+}(aq) + Cu(s)}$

Question 19

In a voltaic cell, which direction do cations move through the salt bridge?

Accepted Answer

Toward the cathode

Electrochemistry and Redox Reactions: Study Notes for General Chemistry

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