Question 1

Which of the following best describes oxidation in terms of electron transfer?

Accepted Answer

Oxidation is the loss of electrons by an atom or molecule.

Question 2

In the reaction $$2H_2(g) + O_2$(g) \rightarrow 2H_2O(g)$$, which element is oxidized and which is reduced?

Accepted Answer

Hydrogen is oxidized and oxygen is reduced.

Question 3

Which statement about oxidation states is TRUE?

Accepted Answer

Oxidation state can be assigned to atoms in both ionic and covalent compounds.

Question 4

Given the reaction $$Ca(s) + 2H_2O(l) \rightarrow Ca(OH)_2(aq) + H_2$(g)$$, which element is being reduced?

Accepted Answer

Hydrogen

Question 5

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

Accepted Answer

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

Question 6

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

Accepted Answer

Copper

Question 7

What is the role of the salt bridge in a voltaic cell?

Accepted Answer

It allows ions to flow between the half-cells to maintain charge balance.

Question 8

In a voltaic cell, where does oxidation occur?

Accepted Answer

At the anode, which is labeled negative (-)

Question 9

Which of the following reactions will be spontaneous according to the activity series?

Accepted Answer

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

Question 10

Which process uses electrical current to drive a nonspontaneous chemical reaction?

Accepted Answer

Electrolysis

Question 11

What is the overall balanced redox reaction for the rusting of iron?

Accepted Answer

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

Question 12

Which of the following statements about batteries is correct?

Accepted Answer

A lead-acid battery can be recharged by running electrical current in the reverse direction.

Question 13

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

Accepted Answer

Balance hydrogen by adding $$H^+.$$

Question 14

Why does aluminum resist further oxidation compared to iron?

Accepted Answer

Aluminum oxide forms a tough, protective coating that adheres to the metal.

Question 15

Which of the following is TRUE about the hydrogen-oxygen fuel cell?

Accepted Answer

It produces electricity by forcing electrons to move through a wire from hydrogen to oxygen.

Question 16

In the electrolysis of water, what are the products?

Accepted Answer

Hydrogen gas and oxygen gas

Question 17

Which of the following best explains the use of a sacrificial anode to prevent corrosion?

Accepted Answer

The sacrificial anode is a metal above iron on the activity series and oxidizes in place of iron.

Question 18

Which of the following is the correct balanced half-reaction for the reduction of silver ions in silver plating?

Accepted Answer

$$Ag^+(aq) + e^- \rightarrow Ag(s)$$

Question 19

Which statement about the activity series of metals is correct?

Accepted Answer

Metals at the top of the activity series are most easily oxidized and most reactive.

Oxidation and Reduction: Study Notes for Introductory Chemistry (Chapter 16)

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