Guided Practice for Redox Reactions
3. Write oxidation numbers above element symbols
For the equations below, assign oxidation numbers,
identify what is oxidized and what is reduced, then
write the half reactions.
2Al + 3Fe2+ → 2Al+3 + 3Fe
0
0
+1 -1
Example: Mg + Br2 → Mg Br2
What is oxidized? Mg
What is reduced? Br
Oxidation half reaction: Mg → Mg+2 + 2eReduction half reaction: Br2 + 2e- → 2Br-
What is oxidized?
What is reduced?
Oxidation half reaction:
Reduction half reaction:
4. Write the oxidation numbers above element symbols
Li + KNO3 → LiNO3 + K
1. Write oxidation numbers above element symbols
2H2 + O2 → 2H2O
What is oxidized?
What is reduced?
Oxidation half reaction:
Reduction half reaction:
2. Write oxidation numbers above element symbols
What is oxidized?
What is reduced?
Oxidation half reaction:
Reduction half reaction:
5. Write oxidation numbers above element symbols
2HCl + Zn → ZnCl2 + H2
Fe + Zn2+ → Fe2+ + Zn
What is oxidized?
What is reduced?
What is oxidized?
What is reduced?
Oxidation half reaction:
Oxidation half reaction:
Reduction half reaction:
Reduction half reaction: