REDOX
Worksheet
1. Assign oxidation numbers to the atoms in the following redox reaction.
2 Sr (s) + O2 (g) à 2 SrO (s)
2. Assign oxidation numbers to the atoms in the following redox reaction.
2 Cs (s) + Br2 (g) à 2 CsBr (s)
3. Complete the half-reactions below and determine if oxidation or reduction has occurred.
a. Fe à Fe3+
b. Mg2+ à Mg
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4. Answer the questions that follow about the redox reaction below.
Li (s) à Li+ + eZn2+ + 2 e- à Zn (s)
a. In which half reaction does oxidation occur?
b. Identify the oxidizing and reducing agents.
c. Balance the half reactions.
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5. Break the following redox reaction into its corresponding reduction and oxidation halfreaction. Make sure they’re balanced.
4 Fe (s) + 3 O2 (g) à 2 Fe2O3 (s)
6. Break the following reaction into its oxidation and reduction half-reactions and balance
them.
2 Al + 6 H+ à 2 Al3+ + 3 H2
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7. Add the following half-reactions together to determine the overall ionic form of the redox
reaction. Label the reduction and oxidation half-reactions and make sure they’re balanced.
Cu0 à Cu2+ + 2 eAg+ + e- à Ag0
8. Add the following half-reactions together to determine the overall ionic form of the redox
reaction. Label the reduction and oxidation half-reactions and make sure they’re balanced.
Li à Li+ + eNi2+ + 2 e- à Ni
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9. Balance the following half-reactions and then combine them into an overall ionic form.
Cr à Cr3+ + 3 eAg+ + e- à Ag
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