Deck 10: Oxidation-Reduction Reactions

Question 1

Which of the batteries listed below is a reusable battery?

A) dry cell battery
B) mercury battery
C) alkaline battery
D) lead storage battery

Answer 1

lead storage battery

Question 2

When a zinc strip is placed in a copper(II) sulfate solution,

A) the copper(II) solution will lose its blue color.
B) the zinc will dissolve.
C) black crystals of copper atoms appear.
D) All of the above occur.

Answer 2

All of the above occur.

Question 3

Charge is transported from place to place in a battery by

A) an anode.
B) a cathode.
C) the migration of ions.
D) an external electrical circuit.

Answer 3

the migration of ions.

Question 4

Which of the following equations represents the reduction of carbon?

A) C + 2 H₂ $\to$ CH₄
B) C + O₂ $\to$ CO₂
C) 2 C + O₂ $\to$ 2 CO
D) C²⁺ $\to$ C⁴⁺ + 2e^-

Question 5

Which of the following equations does not fit the definition of oxidation?

A) Ag⁺ + e^- $\to$ Ag
B) C₂H₆ $\to$ H₂ + C₂H₄
C) C + O₂ $\to$ CO₂
D) Na $\to$ Na⁺ + e^-

Question 6

In the equation 2 Na(s) + Cl₂(g) $\to$ 2 Na⁺ + 2 Cl^-, the oxidizing agent is

A) Na(s).
B) Cl₂(g).
C) Na⁺.
D) Cl^-.

Question 7

Which of the following is not necessary for corrosion of iron?

A) iron
B) water
C) light
D) oxygen

Question 8

In a fuel cell using oxygen as the oxidizer and hydrogen as the fuel, what is the overall cell reaction?

A) H₂O $\to$ H₂ + O₂
B) 2 H₂ + O₂ $\to$ 2 H₂O
C) H₂O + 4 e^- $\to$ 2 H₂ + 4 OH^-
D) O₂ + 4 H⁺ + 4 e^- $\to$ 2 H₂O

Question 9

A battery which may be recharged is called a(n)

A) primary battery.
B) dry cell.
C) electroplating cell.
D) secondary battery.

Question 10

PbSO₄, Pb, and H₂SO₄ are chemicals in

A) dry cell
B) primary battery
C) salt bridge
D) automobile battery

Question 11

Antioxidant vitamins

A) react with DNA.
B) donate electrons to free radicals.
C) are reduced.
D) form free radicals in the body.

Question 12

Which of the following might prevent corrosion of iron?

A) a water spray
B) a coating of zinc
C) acid treatments
D) salt solutions

Question 13

In the equation SnO₂(g) + 2 C(s) $\to$ Sn(s) + 2 CO(g), what substance is the reducing agent?

A) SnO₂
B) C
C) Sn
D) CO

Question 14

In an electrolysis reaction, oxidation occurs at which electrode?

A) cathode
B) anode
C) both electrodes
D) neither electrode

Question 15

Which of the following is not a definition of oxidation?

A) loss of electrons
B) loss of hydrogen
C) loss of protons
D) addition of oxygen

Question 16

Which one of the following will not combine with oxygen?

A) nitrogen
B) aluminum
C) hydrogen
D) helium

Question 17

In a lead storage battery, what lead compound is formed at both the cathode and the anode during discharge?

A) lead oxide (PbO₂)
B) lead chloride (PbCl₂)
C) lead sulfate (PbSO₄)
D) lead oxide (PbO)

Question 18

Free radicals are particles that

A) have an unpaired electron.
B) act as oxidizing agents.
C) grab another electron from a neighboring molecule.
D) all of the above

Question 19

Which is not an example of a primary battery?

A) lead-acid automobile battery
B) alkaline battery
C) mercury battery
D) lithium battery

Question 20

Which of the batteries listed below is a primary battery?

A) lithium ion battery
B) alkaline battery
C) nickel-cadmium battery
D) lead acid battery

Question 21

Free radicals which are also oxidizing agents do not occur naturally in the human body.

Question 22

Which of the following are paired correctly?

A) H₂O₂ - oxidizing agent
B) NaOCl - reducing agent
C) Cl₂ - reducing agent
D) SO₂ - oxidizing agent

Question 23

Which of the following is the function of a bleaching agent?

A) oxidize colored chemicals
B) reduce colored chemicals
C) oxidize bleach
D) remove salts from hard water

Question 24

Which of the following is a free radical?

A) SO₂
B) SO₃
C) NO
D) N₂O

Question 25

Consider the following image, showing on the atomic level, the reaction occurring when a Zn wire is placed in a copper(II) nitrate solution. Which of the following correctly describes the image?

A) Zinc is being oxidized.
B) Copper is being reduced.
C) Zinc is the reducing agent.
D) All of the above are correct descriptions.

Question 26

The reaction(s) found in primary batteries are easily reversible.

Question 27

Which molecule would be a good oxidizing agent?

A) H₂
B) SO₂
C) C
D) H₂O₂

Question 28

H₂ is a often oxidized and O₂ is often an oxidizing agent.

Question 29

Electrolysis

A) is the process of producing electricity.
B) uses electrical energy to produce chemical change.
C) is used to reduce aluminum ore to pure metal.
D) both b and c

Question 30

Vitamin C and beta-carotene are antioxidants found currently in vitamin supplements.

Question 31

Reduction can be viewed as a either a gain of electrons or hydrogen atoms.

Question 32

Identify the oxidized species in the following equation 4Al(s) + 3O₂(g) $\to$ 2Al₂O₃(s)

A) Al(s)
B) O₂(g)
C) Al³⁺
D) O^2-

Question 33

Which molecule would be a good reducing agent?

A) O₂
B) O₃
C) H₂
D) H₂O₂

Question 34

Which of the following is not an antioxidant vitamin?

A) vitamin A
B) vitamin D
C) vitamin C
D) vitamin E

Question 35

Consider the reaction: 3Fe²⁺(aq) + 2Al(s) $\to$ 3Fe(s) + 2Al³⁺(aq)
Which of the following statements is true about Fe²⁺?

A) Fe²⁺ is losing electrons.
B) Fe²⁺ is oxidized.
C) Fe²⁺ is the oxidizing agent.
D) Fe²⁺ is the reducing agent.

Question 36

Which of the following is a free radical?

A) ozone, O₃
B) fluorine, F₂
C) chlorine, Cl₂
D) nitrogen dioxide, NO₂

Question 37

Reducing agents gain electrons and are oxidized.

Question 38

The substance oxidized in an oxidation reduction reaction serves as the reducing agent by losing electrons.

Question 39

Identify the reduced species in the following equation CH₄(g) + 2O₂(g) $\to$ CO₂(g) + 2H₂O(g)

A) C
B) O₂
C) H
D) H₂O

Question 40

Oxidation always occurs

A) with the loss of electrons.
B) with the gain of electrons.
C) with the gain of hydrogen.
D) only for metal atoms and not ions.

Question 41

Consider the following reaction.
3Fe²⁺(aq) + 2Al(s) $\to$ 3Fe(s) + 2Al³⁺(aq)
This reaction takes place in the electrochemical cell shown below.
Complete the following questions using the letters shown in the image.

-Oxidation occurs in compartment _____.

Question 42

The reducing agent in the following reaction is ___________.
I₂ + Zn $\to$ 2I^- + Zn²⁺

Question 43

Consider the following reaction.
3Fe²⁺(aq) + 2Al(s) $\to$ 3Fe(s) + 2Al³⁺(aq)
This reaction takes place in the electrochemical cell shown below.
Complete the following questions using the letters shown in the image.

-The Fe²⁺ should be placed at letter ____.

Question 44

Consider the following reaction.
3Fe²⁺(aq) + 2Al(s) $\to$ 3Fe(s) + 2Al³⁺(aq)
This reaction takes place in the electrochemical cell shown below.
Complete the following questions using the letters shown in the image.

-The electrons flow from electrode _____ to electrode _____.

Question 45

Consider the following reaction.
3Fe²⁺(aq) + 2Al(s) $\to$ 3Fe(s) + 2Al³⁺(aq)
This reaction takes place in the electrochemical cell shown below.
Complete the following questions using the letters shown in the image.

-Al should be placed at letter _____.

Question 46

Consider the following reaction.
3Fe²⁺(aq) + 2Al(s) $\to$ 3Fe(s) + 2Al³⁺(aq)
This reaction takes place in the electrochemical cell shown below.
Complete the following questions using the letters shown in the image.

-If the electrolyte contains nitrate ions, they will move from compartment ___ to compartment ___.

Question 47

Consider the following reaction.
3Fe²⁺(aq) + 2Al(s) $\to$ 3Fe(s) + 2Al³⁺(aq)
This reaction takes place in the electrochemical cell shown below.
Complete the following questions using the letters shown in the image.

-The oxidizing agent is found in compartment ______.