Question 1

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

Accepted Answer

The addition of oxygen atoms and the loss of electrons.

Question 2

In the reaction $$\mathrm{C} + \mathrm{O}_2 \rightarrow \mathrm{CO}_2$$, what is happening to the carbon atom?

Accepted Answer

Carbon is being oxidized by losing electrons and gaining oxygen.

Question 3

Which of the following is the correct half-reaction for the oxidation of iron in the formation of iron(III) oxide?

Accepted Answer

$$4\mathrm{Fe} \rightarrow 4\mathrm{Fe}^{3+} + 12e$$^{-}$$

Question 4

In the reaction $$\mathrm{MgO} \rightarrow \mathrm{Mg} + \mathrm{O}$$, what process is occurring to magnesium?

Accepted Answer

Magnesium is being reduced by losing oxygen.

Question 5

Which of the following best describes reduction?

Accepted Answer

Gain of electrons and loss of oxygen atoms.

Question 6

In an electrochemical cell, which reaction occurs at the anode?

Accepted Answer

Oxidation of metal atoms to metal ions.

Question 7

Given the half-reaction $$\mathrm{Cl}_2 + 2e$$^{-}$$ \rightarrow 2\mathrm{Cl}^{-}$$, what is happening to chlorine?

Accepted Answer

Chlorine is being reduced by gaining electrons.

Question 8

Which of the following metals is most resistant to oxidation under normal conditions?

Accepted Answer

Platinum

Question 9

What is the role of the electrolyte in an electrochemical cell?

Accepted Answer

It allows the flow of ions to maintain electrical neutrality.

Question 10

In the reaction $$\mathrm{Ca}^{2+} + 2e$$^{-}$$ \rightarrow \mathrm{Ca}$$, what is the product and what process is occurring?

Accepted Answer

Calcium metal is produced by reduction.

Question 11

Which of the following reactions represents the reduction half-reaction in the formation of iron(III) oxide?

Accepted Answer

$$3\mathrm{O}_2 + 12e$$^{-}$$ \rightarrow 6\mathrm{O}^{2-}$$

Question 12

Which statement is true regarding the corrosion of metals?

Accepted Answer

Corrosion is an oxidation process where metals lose electrons.

Question 13

A lithium metal electrode in an electrochemical cell undergoes the following reaction: $$\mathrm{Li} \rightarrow \mathrm{Li}^{+} + e$$^{-}$$. What type of reaction is this?

Accepted Answer

Oxidation at the anode.

Question 14

Which of the following best explains why silver and platinum are used in jewelry and electronics?

Accepted Answer

They are resistant to oxidation and corrosion.

Question 15

In a real-world scenario, why is the plating of calcium metal important in an electrochemical cell?

Accepted Answer

It allows the deposition of metallic calcium for industrial use.

Question 16

Which of the following reactions is an example of a redox reaction?

Accepted Answer

$$4\mathrm{Fe} + 3\mathrm{O}_2 \rightarrow 2\mathrm{Fe}_2\mathrm{O}_3$$

Question 17

If a solution contains ions and conducts electricity, what is it called?

Accepted Answer

An electrolyte

Question 18

Which process occurs at the cathode in an electrochemical cell?

Accepted Answer

Reduction of metal ions to metal atoms

Question 19

Which of the following statements about oxidation and reduction is correct?

Accepted Answer

Oxidation is the loss of electrons; reduction is the gain of electrons.

Question 20

A student observes the following reaction in a laboratory: $$\mathrm{Fe} \rightarrow \mathrm{Fe}^{3+} + 3e$$^{-}$$. What is the best classification of this reaction?

Accepted Answer

Oxidation, because iron loses electrons.

Oxidation and Reduction: Fundamental Concepts in Chemistry

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