Answers2026-2027_MDCPS_2003345_Chemistry_1_B-CROxidation-Reduction

Oxidation-Reduction Answers

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

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A
carbon
B
carbon dioxide
C
oxygen
D
hydrogen
2
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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
3

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.
4

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
5

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

Question illustration
A
2CI–
B
CI2
C
Mg
D
Mg2+
6

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.
7

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
8

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

Question illustration
A
2CI–
B
CI2
C
Mg
D
Mg2+
9

Which describes the oxidizing agent in a chemical reaction?

A
the substance that is oxidized because it loses electrons
B
the substance that is reduced because it loses electrons
C
the substance that is oxidized because it gains electrons
D
the substance that is reduced because it gains electrons
10

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

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