Question 1

Which of the following best describes oxidation in a chemical reaction?

Accepted Answer

The loss of electrons by an atom or ion.

Question 2

In the reaction $2Mg(s) + O_2(g) \rightarrow 2MgO(s)$, which element is oxidized and which is reduced?

Accepted Answer

Mg is oxidized, O is reduced.

Question 3

What is the oxidation number of sulfur in $K_2SO_4$?

Accepted Answer

$+6$

Question 4

Which of the following is the correct balanced half-equation for the reduction of $Cu^{2+}$ to $Cu$ in acidic solution?

Accepted Answer

$Cu^{2+} + 2e^- \rightarrow Cu$

Question 5

In a galvanic cell, which electrode is the site of oxidation?

Accepted Answer

Anode

Question 6

Which of the following reactions represents the process of corrosion of iron in the presence of oxygen and water?

Accepted Answer

$2Fe(s) + O_2(g) + 2H_2O(l) \rightarrow 2Fe(OH)_2(s)$

Question 7

What is the standard cell potential ($E_{cell}^\circ$) for a cell made from $Zn(s)$ and $Cu^{2+}(aq)$, given $E_{red}^\circ(Cu^{2+}/Cu) = +0.34V$ and $E_{red}^\circ(Zn^{2+}/Zn) = -0.76V$?

Accepted Answer

$E_{cell}^\circ = +1.10V$

Question 8

During electrolysis of molten $NaCl$, what is produced at the cathode?

Accepted Answer

Sodium metal

Question 9

Which of the following statements about the salt bridge in a galvanic cell is correct?

Accepted Answer

It maintains electrical neutrality by allowing ion flow.

Question 10

In the reaction $2H_2O_2(aq) \rightarrow 2H_2O(l) + O_2(g)$, what is the oxidation number change for oxygen?

Accepted Answer

From $-1$ to $0$

Question 11

Which of the following best explains why pure iron does not rust in contact with pure water?

Accepted Answer

Pure water does not contain dissolved oxygen needed for oxidation.

Question 12

What is the role of the reducing agent in a redox reaction?

Accepted Answer

It is oxidized and loses electrons.

Question 13

Which process occurs at the cathode during electrolysis?

Accepted Answer

Reduction

Question 14

A battery is an example of which type of electrochemical cell?

Accepted Answer

Galvanic cell

Question 15

Which of the following reactions is spontaneous under standard conditions, based on standard reduction potentials: $Zn^{2+} + 2e^- \rightarrow Zn$ ($E^\circ = -0.76V$), $Cu^{2+} + 2e^- \rightarrow Cu$ ($E^\circ = +0.34V$)?

Accepted Answer

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

Question 16

During the electrolysis of aqueous $NaCl$, which product is formed at the anode?

Accepted Answer

Chlorine gas

Question 17

Which of the following is a correct net ionic equation for the reaction in a galvanic cell involving $Zn$ and $Cu^{2+}$?

Accepted Answer

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

Question 18

Which of the following best describes the function of a battery in a portable electronic device?

Accepted Answer

It converts chemical energy into electrical energy.

Question 19

What is the oxidation number of nitrogen in $NH_4^+$?

Accepted Answer

$-3$

Electrochemistry: Oxidation-Reduction, Galvanic Cells, and Applications

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