Question 1

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

Accepted Answer

The loss of electrons by an atom or ion.

Question 2

In the reaction $$\mathrm{2Fe(s) + O_2$(g) + 2H_2O(l) \rightarrow 2Fe(OH)_2(s)}$$, which element is oxidized and which is reduced?

Accepted Answer

Iron is oxidized and oxygen is reduced.

Question 3

Which of the following is the correct oxidation state for oxygen in $$\mathrm{H_2O_2} ($$hydrogen peroxide)?

Accepted Answer

$$-1$$

Question 4

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

Accepted Answer

Zinc is oxidized at the anode.

Question 5

Which of the following metals will NOT dissolve in hydrochloric acid, based on the activity series?

Accepted Answer

Gold

Question 6

What is the role of hydrogen peroxide ($$\mathrm{H_2O_2}) in $$the bleaching of hair?

Accepted Answer

It acts as an oxidizing agent, removing electrons from melanin.

Question 7

Which of the following best describes the function of a salt bridge in a voltaic cell?

Accepted Answer

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

Question 8

Consider the reaction: $$\mathrm{Al(s) + 3Ag^+(aq) \rightarrow Al$$^{3+}$$(aq) + 3Ag(s)}. $$Which species is the reducing agent?

Accepted Answer

$$\mathrm{Al(s)}$$

Question 9

Which of the following statements about corrosion is TRUE?

Accepted Answer

Corrosion is the oxidation of metals, often resulting in rust.

Question 10

Which of the following is a correct balanced half-reaction for the reduction of $$\mathrm{Cu$$^{2+}$$} to$$ $$\mathrm{Cu}$$?

Accepted Answer

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

Question 11

A fuel cell breathalyzer uses a redox reaction to detect alcohol. What is oxidized at the anode?

Accepted Answer

Ethyl alcohol ($$\mathrm{C_2H_5OH})$$

Question 12

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

Accepted Answer

Assign oxidation states, balance O with $$\mathrm{H_2O}$$, balance H with $$\mathrm{H^+}$$, balance charge with electrons, combine half-reactions.

Question 13

Which of the following statements about the activity series of metals is correct?

Accepted Answer

Metals at the top are most easily oxidized.

Question 14

Which of the following best explains why aluminum does not corrode as rapidly as iron, even though it is above iron in the activity series?

Accepted Answer

Aluminum forms a protective oxide layer that prevents further oxidation.

Question 15

Which of the following reactions occurs in an electrolytic cell?

Accepted Answer

$$\mathrm{2H_2O(l) \rightarrow 2H_2(g) + O_2$(g)}$$

Question 16

A student is asked to identify the oxidizing agent in the reaction $$\mathrm{Zn(s) + Cu$$^{2+}$$(aq) \rightarrow Zn$$^{2+}$$(aq) + Cu(s)}. $$What should the student answer?

Accepted Answer

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

Question 17

Which of the following best describes what happens when a lead-acid battery is recharged?

Accepted Answer

The redox reactions are reversed by an external electrical current.

Question 18

Which of the following is a real-world application of electrolysis?

Accepted Answer

Plating silver onto jewelry.

Question 19

Which of the following statements about batteries is correct?

Accepted Answer

A battery dies when the reactants of the redox reaction are depleted.

Chapter 16: Oxidation and Reduction – Study Notes for Introductory Chemistry

Study Guide - Practice Questions

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