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Name____________________________ Date________________ Pd_____
Redox Practice
Part I. Oxidation States
1) Give the oxidation number of each kind of atom or ion.
a.) Sn
c.) Fe2+
b.) S2d.) Fe3+
e.) Ne
f.) Br-
2) Write the oxidation number for just nitrogen in each of the following compounds.
a) NH3
c) NO2e) N2O
g) NH2OH
b) N2
d) NO2
f) NO3h) NO
3) Assign oxidation numbers to each of the atoms in the following compounds:
a) Na2CrO4
Na =
Cr =
O=
e) HClO4
b) K2Cr2O7
K=
Cr =
O=
f) MnO2
c) CO2
C=
O=
g) SO32d) CH4
C=
H=
h) SF4
H=
Mn =
S=
S=
Cl =
O=
O=
F=
i)
NH4+
O=
Part II. Determine what is oxidized, what is reduced, the reducing agent, and the oxidizing agent in each reaction.
1) 2 Sr + O2  2 SrO
Element oxidized: ____
Element reduced: ____
Reducing agent: _____
Oxidizing agent: ____
2) 3 Mg + N2  Mg3N2
Element oxidized: ____
Element reduced: ____
Reducing agent: ____
Oxidizing agent: ____
3) 4 Fe + 3 O2  2 Fe2O3
Element oxidized: ____
Element reduced: ____
Reducing agent: ____
Oxidizing agent: ____
4) Cl2 + 2 NaBr  2NaCl + Br2
Element oxidized: ____
Element reduced: ____
Reducing agent: ____
Oxidizing agent: ____
5) Si + 2 F2  SiF4
Element oxidized: ____
Element reduced: ____
Reducing agent: ____
Oxidizing agent: ____
6) Mg + 2 HCl  MgCl2 + H2
Element oxidized: ____
Element reduced: ____
Reducing agent: ____
Oxidizing agent: ____
7) 2 Na + 2 H2O  2 NaOH + H2
Element oxidized: ____
Element reduced: ____
Reducing agent: ____
Oxidizing agent: ___
8) Cr2O72- + 2OH- → 2 CrO42- + H2O
Element oxidized: ____
Element reduced: ____
Reducing agent: ____
Oxidizing agent: ____
9) NH4NO2 → N2 + 2 H2O
Element oxidized: ____
Element reduced: ____
Reducing agent: ____
Oxidizing agent: ____
10) 2 Cr3+ + H2O + 6 ClO3- → Cr2O72- + 6 ClO2 + 2 H+
Element oxidized: ____
Element reduced: ____
Reducing agent: ____
Oxidizing agent: ___