Chemistry Concepts and Applications

Chapter 16: Oxidation-Reduction Reactions

Chapter Test Practice

1
In the reaction shown, zinc __________ electrons and so is __________, while oxygen __________ electrons and so is __________.

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A)gives up, oxidized, accepts, reduced
B)gives up, reduced, accepts, oxidized
C)accepts, oxidized, gives up, reduced
D)accepts, reduced, gives up, oxidized
2
In a redox reaction, the reducing agent __________ electrons; the oxidizing agent __________ electrons.

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A)gains, gains
B)loses, loses
C)gains, loses
D)loses, gains
3
In terms of corrosion, what is the key difference between iron oxide and aluminum oxide?

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A)Iron oxide forms a tougher coating than does aluminum oxide.
B)Aluminum oxide forms a tougher coating than does iron oxide.
C)Aluminum oxidizes more easily than iron, and therefore does not last as long.
D)Iron oxidizes more easily than aluminum, and therefore does not last as long.
4
What is the oxidation number of iron in Fe2O3?
A)3+
B)1+
C)2+
D)2-
5
Sodium __________ when it reacts with sulfur to form sodium sulfide.
A)gains one electron
B)gains two electrons
C)is oxidized
D)is reduced
6
What chemical species is oxidized in the reaction represented by the unbalanced equation H2O2(l) + Br-(aq) → Br2(aq) + H2O(l)?
A)Br-(aq)
B)H2O2(l)
C)O-(aq)
D)H2O(l)
7
__________ are reduced when black-and-white photographic film is exposed to light.
A)Ag+ ions
B)Ag atoms
C)Br atoms
D)Br- ions
8
As ethanol is oxidized in a breathalyzer, chromium in orange dichromate ions is reduced to __________.
A)black Cr atoms
B)blue-green Cr3+ ions
C)colorless Cr6+ ions
D)yellow Cr4+ ions
9
__________ reactions release light energy at room temperature.
A)all redox
B)chemiluminescent redox
C)decomposition
D)double-displacement
10
In the thermite reaction, powdered aluminum combines with iron oxide to produce aluminum oxide and molten iron. What is oxidized?
A)iron
B)iron oxide
C)aluminum
D)aluminum oxide
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