AnswersTX-Chemistry BUnit Test

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21
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Consider the following equilibrium reaction.Ni2+(aq) + Sn(s) Ni(s) + Sn2+(aq)The forward reaction is non-spontaneous. What does this indicate about the relative strengths of the reducing and oxidizing agents on each side of the equation?

Question illustration
A
The agents are of equal strength on both sides of the equation.
B
The stronger agents are on the left side of the equation.
C
The stronger agents are on the right side of the equation.
D
The relative strengths of the agents cannot be inferred.
22
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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.
23

In the reaction equation BrO(aq) Br–(aq) + BrO(aq), how many oxidation states does the disproportionate substance have throughout the reaction?

Question illustration
A
0
B
1
C
2
D
3
24

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
25

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.
26

Gold (Au) goes from an oxidation number of +3 to 0 in the reaction below.2Au3+ + 6I– 2Au + 3I2What describes the Au3+ ion?

Question illustration
A
It is the result of oxidation.
B
It the result of disproportionation.
C
It is the oxidizing agent.
D
It is the reducing agent.
27

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

Question illustration
A
2CI–
B
CI2
C
Mg
D
Mg2+
28

Read the table below.Reduction Half-ReactionStandard Reduction Potential (V)What is the overall reaction potential for the reaction below?Al3+(aq) + Mg(s) Al(s) + Mg2+(aq)

Question illustration
A
–4.03 V
B
–0.71 V
C
+0.71 V
D
+4.03 V
29

Consider the redox reaction below.Which half reaction correctly describes the oxidation that is taking place?

Question illustration
A
Upper Z n superscript 2 plus (s) plus 2 e superscript minus (a q) right arrow upper Z n (s).
Option A
B
Upper Z n (s) right arrow upper Z n superscript 2 plus (a q) plus 2 e superscript minus.
Option B
C
2 upper H superscript plus, plus 2 e superscript minus right arrow upper H subscript 2.
Option C
D
Upper H subscript 2 plus 2 e superscript minus right arrow 2 upper H superscript plus.
Option D
30

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
31

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
32

Which equation describes a reduction?

A
Upper M g (s) right arrow Uper M g superscript 2 plus (a q) plus 2 e superscript minus.
Option A
B
2 upper C l plus 2 e superscript minus right arrow 2 upper C l superscript minus.
Option B
C
Upper N a (s) right arrow upper N a superscript plus (a q) plus e superscript minus.
Option C
D
Upper A l (s) right arrow upper A l superscript 3 plus (a q) plus 3 e superscript minus.
Option D
33

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

A
KNO3
B
H2SO4
C
NaOH
D
H2
34

Consider the half reaction below.Which statement best describes what is taking place?

Question illustration
A
Copper is being oxidized.
B
Copper is being reduced.
C
Copper is losing electrons.
D
Copper is a reducing agent.
35

During a redox reaction, the term reduction refers to

A
the gain of electrons.
B
the loss of electrons.
C
the gain of protons.
D
the loss of protons.
36

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
37

What describes the change in oxidation states of the following reaction?

Question illustration
A
Cl– reduces to Cl and F oxidizes to F–.
B
Cl– oxidizes to Cl and F reduces to F–.
C
Cl– is the reducing agent and F is the oxidizing agent.
D
Cl is the reducing agent and F– is the oxidizing agent.
38

Zn(s) + 2H+(aq) Zn2+(aq) + H2(g) has an overall reduction potential of 0.76 V. Therefore,

Question illustration
A
the reaction is not spontaneous and will require energy to proceed.
B
the reaction is spontaneous and will proceed without any energy input.
C
the reduction potentials cancel out and prevent any reaction.
D
the forward and reverse reactions are each spontaneous.
39

In a disproportionation reaction, the disproportionate substance

A
has exactly one oxidation state.
B
has exactly two oxidation states.
C
has at least three oxidation states.
D
has either one or two oxidation states.

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