Q: Which of the following is the correct half-reaction for the reduction of silver ions in a photochromic lens?

$$\text{Ag}^+ + e^- \rightarrow \text{Ag}$$

Q: A lead storage battery is recharged by reversing the overall reaction. Which of the following is the correct equation for the recharging process?

$$2\text{PbSO}_4 + 2\text{H}_2\text{O} \rightarrow \text{Pb} + \text{PbO}_2 + 2\text{H}_2\text{SO}_4$$

Q: Which of the following is the correct balanced equation for the oxidation of glucose in cellular respiration?

$$\text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2 \rightarrow 6\text{CO}_2 + 6\text{H}_2\text{O} + \text{energy}$$

Question 1

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

Accepted Answer

Loss of electrons and gain of oxygen

Question 2

In the reaction $$2	ext{Zn} ightarrow 2	ext{Zn}^{2+} + 4e^-$$, what is happening to zinc?

Accepted Answer

Zinc is being oxidized because it loses electrons.

Question 3

Which of the following is the correct half-reaction for the reduction of silver ions in a photochromic lens?

Accepted Answer

$$	ext{Ag}^+ + e^- ightarrow 	ext{Ag}$$

Question 4

In a galvanic cell, which statement is true?

Accepted Answer

Oxidation occurs at the anode and reduction occurs at the cathode.

Question 5

Which of the following substances is commonly used as an oxidizing agent in household bleach?

Accepted Answer

$$	ext{NaOCl}$$

Question 6

A lead storage battery is recharged by reversing the overall reaction. Which of the following is the correct equation for the recharging process?

Accepted Answer

$$2	ext{PbSO}_4 + 2	ext{H}_2	ext{O} ightarrow 	ext{Pb} + 	ext{PbO}_2 + 2	ext{H}_2	ext{SO}_4$$

Question 7

Which of the following best explains why aluminum does not corrode as rapidly as iron, even though it is more reactive?

Accepted Answer

Aluminum forms a tough oxide layer that protects it from further corrosion.

Question 8

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

Accepted Answer

The rusting of iron tools left outside in the rain.

Question 9

In the reaction $$2	ext{C} + 	ext{O}_2 ightarrow 2	ext{CO}$$, which is the reducing agent?

Accepted Answer

C (carbon)

Question 10

Which of the following statements about hydrogen peroxide ($$	ext{H}_2	ext{O}_2) is $$correct?

Accepted Answer

It acts as an oxidizing agent and is used as a disinfectant.

Question 11

Which of the following best describes the role of antioxidants in food?

Accepted Answer

They act as reducing agents to prevent oxidation of food molecules.

Question 12

Which of the following is the correct balanced equation for the oxidation of glucose in cellular respiration?

Accepted Answer

$$	ext{C}_6	ext{H}_{12}	ext{O}_6 + 6	ext{O}_2 ightarrow 6	ext{CO}_2 + 6	ext{H}_2	ext{O} + 	ext{energy}$$

Question 13

Which of the following is a common misconception about redox reactions?

Accepted Answer

Oxidation and reduction can occur independently in a chemical reaction.

Question 14

In the reaction $$2	ext{Fe} + 	ext{O}_2 + 2	ext{H}_2	ext{O} ightarrow 2	ext{Fe(OH)}_2$$, what is the oxidation state of iron before and after the reaction?

Accepted Answer

0 before, +2 after

Question 15

Which of the following is a correct statement about catalysts in redox reactions?

Accepted Answer

Catalysts increase the rate of a chemical reaction by lowering the activation energy.

Question 16

Which of the following is a real-life example of a reduction process?

Accepted Answer

The development of black-and-white photographic film.

Question 17

Which of the following best describes the function of a fuel cell?

Accepted Answer

It uses a redox reaction to generate electricity from a fuel and oxygen.

Question 18

Which of the following is the correct description of the process that occurs when silver tarnish is removed using aluminum and sodium bicarbonate?

Accepted Answer

Aluminum reduces silver ions back to silver metal.

Oxidation and Reduction: Key Concepts and Applications

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