AnswersFoothill-B Period-Chemistry-2627BLab: Titration

Oxidation-Reduction Answers

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1
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Which of the following is a simple definition of oxidation?

A
the loss of electrons
B
the gain of electrons
C
an agent that oxidizes something
D
an agent that reduces something
2
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In the redox reaction below, which is the reducing agent?MnO2(s) + 4H+(aq) + 2Cl–(aq) Mn2+(aq) + 2H2O(l) + Cl2(g)

Question illustration
A
CI–
B
CI2
C
Mn2+
D
MnO2
3

Given the reaction below, which is being reduced?Mg + Cl2 Mg2+ + 2Cl–

Question illustration
A
2CI–
B
CI2
C
Mg
D
Mg2+
4

Which type of reaction occurs in the following?2HgO(s) 2Hg(l) + O2(g)

Question illustration
A
a decomposition reaction in which a metal is reduced
B
an acid-base neutralization reaction to produce oxygen gas
C
a displacement reaction involving two metals
D
a combustion reaction involving burning a metal in oxygen
5

Consider the following reaction.CO2(g) + H2(g) CO(g) + H2O(l) What is being oxidized?

Question illustration
A
carbon
B
carbon dioxide
C
oxygen
D
hydrogen
6

The presence of which reactant is the best indicator of an oxidation-reduction reaction?

A
KNO3
B
H2SO4
C
NaOH
D
H2
7

Which of the following is an oxidation-reduction reaction?

A
Fe2O3 + 3CO 2Fe + 3CO2
Option A
B
CuSO4 + 2NaOH Cu(OH)2 + Na2SO4
Option B
C
2NaOH + H2CO3 Na2CO3 + 2NaOH
Option C
D
Pb(NO3)2 + Na2SO4 2NaNO3 + PbSO4
Option D
8

Which of the following is true about a redox reaction?

A
In a redox reaction, the reducing agent loses electrons.
B
In a redox reaction, the oxidizing agent loses electrons.
C
In a redox reaction, the oxidized species gains electrons.
D
In a redox reaction, the reduced species loses electrons.
9

Given the reaction below, which is being oxidized?Mg + Cl2 Mg2+ + 2Cl–

Question illustration
A
2CI–
B
CI2
C
Mg
D
Mg2+
10

What is the oxidation number for S in the compound SO3? (Recall that O has an oxidation number of –2.)

A
0
B
+2
C
+4
D
+6
11

Which best describes the oxidizing agent in this reaction? Cl2(aq) + 2Br–(aq) 2Cl–(aq) + Br2(aq)

Question illustration
A
Bromine (Br) is the oxidizing agent because it gains an electron.
B
Bromine (Br) is the oxidizing agent because it loses an electron.
C
Chlorine (Cl) is the oxidizing agent because it gains an electron.
D
Chlorine (Cl) is the oxidizing agent because it loses an electron.
12

Which type of reaction occurs in the following?2HgO(s) 2Hg(l) + O2(g)

Question illustration
A
a decomposition reaction in which a metal is reduced
B
an acid-base neutralization reaction to produce oxygen gas
C
a displacement reaction involving two metals
D
a combustion reaction involving burning a metal in oxygen
13

Consider the following reaction.CO2(g) + H2(g) CO(g) + H2O(l) What is being oxidized?

Question illustration
A
carbon
B
carbon dioxide
C
oxygen
D
hydrogen
14

Which identifies an oxidation-reduction reaction?

A
a double replacement reaction
B
a neutralization reaction
C
a reaction in which oxidation numbers change
D
a reaction in which no electrons are transferred
15

Which of the following is an oxidation-reduction reaction?

A
ZnS(s) + 2O2(g) ZnSO4(s)
Option A
B
CaO(s) + H2O(l) Ca(OH)2(s)
Option B
C
6Li2O(s) + P4O10(g) 4Li3PO4(s)
Option C
D
SO2(g) + H2O(l) H2SO3(aq)
Option D
16

In the redox reaction below, which is the reducing agent?MnO2(s) + 4H+(aq) + 2Cl–(aq) Mn2+(aq) + 2H2O(l) + Cl2(g)

Question illustration
A
CI–
B
CI2
C
Mn2+
D
MnO2
17

Given the reaction below, which is being reduced?Mg + Cl2 Mg2+ + 2Cl–

Question illustration
A
2CI–
B
CI2
C
Mg
D
Mg2+
18

Which of the following is a simple definition of oxidation?

A
the loss of electrons
B
the gain of electrons
C
an agent that oxidizes something
D
an agent that reduces something
19

Which best identifies why the rusting of an iron nail in the presence of water and oxygen is an oxidation-reduction reaction?

A
Water is a reactant.
B
Electrons are transferred.
C
Nonmetals and a metal are involved.
D
Energy is released.
20

Which answer best describes what is happening in the following reaction?2C8H18 + 25O2 16CO2 + 18H2O

Question illustration
A
This is not a redox reaction. It is an example of combustion.
B
This is a redox reaction in which octane (C8H18) is the reducing agent.
C
This is a redox reaction in which carbon dioxide (CO2) burns due to ignition.
D
This is not a redox reaction, because a solution of carbon dioxide and water results.

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