AnswersTX-Chemistry BUnit Test

Unit Test — Unit test Answers

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

Question illustration
A
Bromine (Br) loses an electron, so it is the reducing agent.
B
Bromine (Br) gains an electron, so it is the reducing agent.
C
Chlorine (Cl) loses an electron, so it is the reducing agent.
D
Chlorine (Cl) gains an electron, so it is the reducing agent.
2
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Which substance loses electrons in a chemical reaction?

A
the one that is oxidized, which is the oxidizing agent
B
the one that is reduced, which is the reducing agent
C
the one that is oxidized, which is the reducing agent
D
the one that is reduced, which is the oxidizing agent
3

What is the final, balanced equation that is formed by combining these two half reactions?

Question illustration
A
Upper C u superscript 2 plus, plus upper N upper O subscript 3 superscript minus, plus 4 e superscript minus, plus 2 upper H superscript plus right arrow upper C u plus upper N upper O subscript 2 superscript minus, plus upper H subscript 2 upper O.
Option A
B
Upper C u plus upper N upper O subscript 3 superscript minus, plus 2 upper H superscript plus right arrow upper C u superscript 2 plus, plus upper N upper O subscript 2 superscript minus, plus upper H subscript 2 upper O.
Option B
C
2 upper C u plus upper N upper O subscript 3 superscript minus plus 2 upper H superscript plus right arrow 2 upper C u superscript 2 plus, plus upper N upper O subscript 2 superscript minus, plus upper H subscript 2 upper O.
Option C
D
Upper C u plus upper N upper O subscript 3 superscript minus, plus 2 upper H superscript plus right arrow upper C u superscript 2 plus, plus upper N upper O subscript 2 superscript minus, plus 2 upper H subscript 2 upper O.
Option D
4

The following equations are half reactions and reduction potentials. Ag+(aq) + e– Ag(s) has a reduction potential of +0.80 V. Cr3+(aq) + 3e– Cr(s) has a reduction potential of –0.74 V.Which statement best compares the substances in these half reactions?

Question illustration
A
A silver ion gains electrons more easily and is a stronger oxidizing agent than a chromium(III) ion.
B
A silver ion loses electrons more easily and is a stronger oxidizing agent than a chromium(III) ion.
C
A silver ion gains electrons more easily and is a stronger reducing agent than a chromium(III) ion.
D
A silver ion loses electrons more easily and is a stronger reducing agent than a chromium(III) ion.
5

Consider the reaction that occurs when copper is added to nitric acid.Cu(s) + 4HNO3(aq) Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l)What is the reducing agent in this reaction?

Question illustration
A
Cu
B
NO3–
C
Cu(NO3)2
D
NO2
6

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

Question illustration
A
Z n (s) right arrow upper Z n superscript 2 plus (a q) plus e superscript minus.
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
Upper C u superscript 2 plus (a q) plus 2 e superscript minus right arrow upper C u (s).
Option C
D
Upper C u superscript 2 plus (a q) plus e superscript minus right arrow upper C u (s).
Option D
7

Equations can be balanced by using the half-reaction method. Which step should be completed first when using this method?

A
inserting the coefficients
B
balancing the half reactions
C
identifying the half reactions
D
finding the oxidation states of atoms
8

Read the table below.Reduction Half-ReactionStandard Reduction PotentialWhich of the following substances is the most powerful oxidizing agent?

Question illustration
A
Br2
B
CI2
C
Cr3+
D
Sn2+
9

Which of the following is a simple definition of reduction?

A
the loss of electrons
B
the gain of electrons
C
an agent that oxidizes something
D
an agent that reduces something
10

Given that Cu(s) + 2HCI(aq) Cu2+(aq) + 2CI–(aq) + H2(g) has an overall reduction potential of –0.34 V, what is a valid prediction about how this reaction works?

Question illustration
A
The reaction is not spontaneous and will require energy to proceed.
B
The reverse reaction would require energy input in order to occur.
C
The half reactions would both occur spontaneously.
D
The reaction is not spontaneous, and it is impossible to make it occur.
11

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

Question illustration
A
Iron is being reduced.
B
Iron is being oxidized.
C
Iron is gaining electrons.
D
Iron is an oxidizing agent.
12

Which best describes an oxidizing agent?

A
a reactant that undergoes oxidation
B
a reactant that undergoes reduction
C
the product of an oxidation
D
the product of a reduction

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