Download oxidation numbers worksheet

Chemistry 3202
1.
2.
Oxidation Numbers
Determine the oxidation number of the specified element in each of the following.
a.
N in NF3
b.
S in S8
c.
Cr in CrO42-
d.
P in P2O5
e.
C in C12H22O11
f.
C in CHCl3
Determine the oxidation number of each element in each of the following.
a.
H2SO3
b.
OH-
c.
HPO42-
Chemistry 3202
3.
As stated in rule 4, oxygen does not always have its usual oxidation number of -2.
Determine the oxidation number of oxygen in each of the following.
a.
the compound oxygen difluoride, OF2
b.
4.
5.
Oxidation Numbers
the peroxide ion, O22-
Determine the oxidation number of each element in each of the following ionic
compounds by considering the ions separately.
a.
Al(HCO3)3
b.
(NH4)3PO4
c.
K2H3IO6
Use oxidation numbers to determine whether each reaction is a redox reaction.
a.
H2O2 +
2Fe(OH)2 
b.
PCl3
3 H2O 
+
H3PO3
2Fe(OH)3
+
3 HCl
Chemistry 3202
Oxidation Numbers
6.
Identify the oxidizing agent and the reducing agent for the redox reaction(s) in the
previous question.
7.
For the following balanced net ionic equation, use oxidation numbers to identify the
reactant that undergoes oxidation and the reactant that undergoes reduction.
Br2
+
2 ClO2-  2 Br- +
2 ClO2
8.
Nickel and copper are two metals that have played a role in the economy of
Newfoundland and Labrador. Nickel and copper ores usually contain the metals as
sulfides, such as NiS and Cu2S. Do the extractions of these pure elemental metals from
their ores involve redox reactions? Explain your reasoning.