Question 1

Which of the following best describes the process of oxidation in a redox reaction?

Accepted Answer

The loss of electrons by an atom or ion.

Question 2

In the hydrogen–oxygen fuel cell, what is the only emission produced during operation?

Accepted Answer

Water

Question 3

Which of the following is the correct mnemonic for remembering oxidation and reduction?

Accepted Answer

OIL RIG—Oxidation Is Loss (of electrons); Reduction Is Gain (of electrons)

Question 4

Which element is being reduced in the following reaction? $$ \mathrm{Mg}(s) + \mathrm{Cu}^{2+}(aq) \rightarrow \mathrm{Mg}^{2+}(aq) + \mathrm{Cu}(s) $$

Accepted Answer

Copper

Question 5

A voltaic cell is constructed using zinc and copper electrodes. Which of the following statements is correct?

Accepted Answer

Electrons flow from the zinc electrode to the copper electrode.

Question 6

Which of the following metals would NOT dissolve in hydrochloric acid according to the activity series?

Accepted Answer

Gold

Question 7

What is the oxidation state of chromium in $$ \mathrm{Cr}_2\mathrm{O}_7$$^{2-}$$ $$?

Accepted Answer

$$+6$$

Question 8

Which of the following best explains why aluminum resists corrosion better than iron?

Accepted Answer

Aluminum forms a tough, clear oxide coating that protects the underlying metal.

Question 9

Which of the following is a correct step in balancing a redox reaction in acidic solution using the half-reaction method?

Accepted Answer

Balance hydrogen by adding $$ \mathrm{H}^+ .$$

Question 10

A dead battery in a voltaic cell is best explained by which of the following?

Accepted Answer

The products have accumulated and the reactants are depleted.

Question 11

Which of the following statements about electrolysis is correct?

Accepted Answer

Electrolysis uses electrical current to drive a nonspontaneous redox reaction.

Question 12

Which of the following is a real-world application of redox chemistry?

Accepted Answer

The bleaching of hair using hydrogen peroxide

Question 13

In a dry-cell battery, which component acts as the anode?

Accepted Answer

Zinc case

Question 14

Which of the following best describes the role of a sacrificial anode in preventing corrosion?

Accepted Answer

It is a metal above iron on the activity series that oxidizes in place of iron.

Question 15

Which of the following reactions is spontaneous according to the activity series?

Accepted Answer

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

Question 16

Which of the following best describes what happens at the cathode in a voltaic cell?

Accepted Answer

Reduction occurs and electrons are gained.

Question 17

Which of the following is a correct step in balancing a redox reaction in basic solution using the half-reaction method?

Accepted Answer

Balance H by adding $$ \mathrm{H}^+ $$, then neutralize with $$ \mathrm{OH}^- .$$

Question 18

Which of the following statements about the hydrogen–oxygen fuel cell is correct?

Accepted Answer

Hydrogen is oxidized and oxygen is reduced.

Question 19

Which of the following best explains why gold is used for jewelry?

Accepted Answer

Gold is low on the activity series and resists oxidation.

Question 20

Which of the following is true about the process of electroplating silver onto another metal?

Accepted Answer

Silver ions are reduced at the cathode, coating the object with silver.

Chapter 16: Oxidation and Reduction – Redox Reactions, Batteries, and Electrolysis

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