Chapter 16:
Oxidation-Reduction Reactions
Practice Test
1.
As ethanol is oxidized in a breathalyzer, chromium in orange dichromate ions is reduced to ________________.
a.
yellow Cr
4+
ions
b.
colorless Cr
6+
ions
c.
blue-green Cr
3+
ions
d.
black Cr atoms
Hint
2.
What chemical species is the reducing agent in the reaction described in question 23?
a.
Br
2
b.
Br
-
c.
O
-
d.
H
2
O
2
Hint
3.
A reaction in which __________ are lost and gained is an oxidation-reduction reaction.
a. protons
b. electrons
c. neutrons
d. hydrogen ions
Hint
4.
What chemical species is oxidized in the reaction represented by the unbalanced equation H
2
O
2
(l) + Br
-
(aq)
Br
2
(aq) + H
2
O(l)?
a.
H
2
O
2
b.
H
2
O
2
c.
O
-
d.
Br
-
Hint
5.
When aluminum metals reacts with the tarnish on silver, products of the reaction include ____________.
a.
Ag and H
+
b.
Ag
+
and Al
c.
Ag and Al
3+
d.
Al and OH
-
Hint
6.
Large deposits of solid, elemental __________ are formed in redox reactions near the vents of some volcanoes.
a.
oxygen
b.
sulfur
c.
chlorine
d.
hydrogen
Hint
7.
What is the reducing agent in the reaction Cu(s) + 2AgNO
3
(aq)
2Ag(s) + Cu(NO
3
)
2
(aq)?
a.
NO
3
1-
b.
Ag
1+
c.
Ag(s)
d.
Cu
Hint
8.
What is the oxidizing agent in the reaction Cu(s) + 2AgNO
3
(aq)
2Ag(s) + Cu(NO
3
)
2
(aq)?
a.
Ag(s)
b.
NO
3
1-
c.
Ag
1+
d.
Cu
Hint
9.
Which type of can takes the longest to degrade?
a.
iron
b.
tin
c.
steel
d.
aluminum
Hint
10.
What is the oxidation number of chlorine in KClO
3
?
a.
3+
b.
1-
c.
1+
d.
5+
Hint
11.
_______ are reduced when black-and-white photographic film is exposed to light.
a.
Ag atoms
b.
Br
1-
ions
c.
Ag
1+
ions
d.
Br atoms
Hint
12.
What is the oxidation number of iron in Fe
2
O
3
?
a.
1+
b.
3+
c.
2+
d.
2-
Hint
13.
Sodium __________ when it reacts with sulfur to form sodium sulfide.
a.
gains one electron
b.
is reduced
c.
gains two electrons
d.
is oxidized
Hint
14.
________________ reactions release light energy at room temperature.
a.
Chemiluminescent redox
b.
All redox
c.
decomposition
d.
Double-replacement
Hint
15.
The fixer used in black-and-white photography contains ________________.
a.
thiosulfate ions
b.
chloride ions
c.
sulfur atoms
d.
barium ions
Hint
16.
Luminol is used in a preliminary test for _______________.
a.
blood
b.
milk
c.
clay
d.
saliva
Hint
17.
Some organisms use redox reactions to produce light in a process known as ______________.
a.
photosynhesis
b.
bioluminescence
c.
respiration
d.
photolysis
Hint
18.
Bleach removes stain from clothing by ___________ colored molecules.
a.
protecting
b.
oxidizing
c.
reducing
d.
dissolving
Hint
19.
What chemical species is reduced in the reaction described in question 23?
a.
Br
-
b.
Br
2
c.
H
2
O
2
d.
O
-
Hint
20.
___________ reduces iron ore to iron in a blast furnace.
a.
calcium carbonate
b.
oxygen
c.
calcium
d.
Carbon monoxide
Hint
