Chapter 16:
Oxidation-Reduction Reactions
Practice Test
1.
Which element is oxidized in the reaction BaCl
2
(aq) + Na
2
SO
4
(aq)
2NaCl(aq) + BaSO
4
(s)?
a.
none
b.
Na
c.
Ba
d.
Cl
Hint
2.
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.
Br
-
b.
H
2
O
2
c.
H
2
O
2
d.
O
-
Hint
3.
What chemical species is the reducing agent in the reaction described in question 23?
a.
Br
-
b.
Br
2
c.
H
2
O
2
d.
O
-
Hint
4.
What is the oxidizing agent in the reaction Cu(s) + 2AgNO
3
(aq)
2Ag(s) + Cu(NO
3
)
2
(aq)?
a.
Cu
b.
Ag(s)
c.
NO
3
1-
d.
Ag
1+
Hint
5.
What is the oxidation number of chlorine in KClO
3
?
a.
1-
b.
3+
c.
5+
d.
1+
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.
Sodium __________ when it reacts with sulfur to form sodium sulfide.
a.
gains two electrons
b.
gains one electron
c.
is reduced
d.
is oxidized
Hint
8.
Some organisms use redox reactions to produce light in a process known as ______________.
a.
respiration
b.
photosynhesis
c.
bioluminescence
d.
photolysis
Hint
9.
Bleach removes stain from clothing by ___________ colored molecules.
a.
oxidizing
b.
protecting
c.
dissolving
d.
reducing
Hint
10.
A reaction in which __________ are lost and gained is an oxidation-reduction reaction.
a. electrons
b. protons
c. neutrons
d. hydrogen ions
Hint
11.
What is the oxidation number of iron in Fe
2
O
3
?
a.
1+
b.
2-
c.
3+
d.
2+
Hint
12.
What chemical species is reduced in the reaction described in question 23?
a.
Br
-
b.
O
-
c.
H
2
O
2
d.
Br
2
Hint
13.
___________ reduces iron ore to iron in a blast furnace.
a.
calcium carbonate
b.
Carbon monoxide
c.
oxygen
d.
calcium
Hint
14.
As ethanol is oxidized in a breathalyzer, chromium in orange dichromate ions is reduced to ________________.
a.
colorless Cr
6+
ions
b.
yellow Cr
4+
ions
c.
blue-green Cr
3+
ions
d.
black Cr atoms
Hint
15.
Most bleaches utilize reactions involving this chemical species.
a.
ClO
3
1-
b.
ClO
1-
c.
NaOH
d.
Cl
2
Hint
16.
When aluminum metals reacts with the tarnish on silver, products of the reaction include ____________.
a.
Ag
+
and Al
b.
Al and OH
-
c.
Ag and H
+
d.
Ag and Al
3+
Hint
17.
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
18.
_______ are reduced when black-and-white photographic film is exposed to light.
a.
Ag atoms
b.
Ag
1+
ions
c.
Br
1-
ions
d.
Br atoms
Hint
19.
The fixer used in black-and-white photography contains ________________.
a.
sulfur atoms
b.
thiosulfate ions
c.
barium ions
d.
chloride ions
Hint
20.
The vitamin C in lemons is a/an ______________.
a.
good antioxidant
b.
carbohydrate
c.
corrosive compound
d.
oxidizing agent
Hint
