1. Redox Reactions – Examples(1 – Synthesis) The following is one type of oxidation/ reduction reaction. 1.Balance the equation. 2.Indicate the species that are oxidized and reduced. 3.Write the half reactions for each. Fe + O 2 ---> Fe 2 O 3

2. The following is one type of oxidation/ reduction reaction. 1.Balance the equation. 2.Indicate the species that are oxidized and reduced. 3.Write the half reactions for each. Fe (s) + O 2(g) ---> Fe 2 O 3 (s) 4Fe + 3O 2 ---> 2Fe 2 O 3 balanced

3. The following is one type of oxidation/ reduction reaction. 1.Balance the equation. 2.Indicate the species that are oxidized and reduced. 3.Write the half reactions for each. Fe + O 2 ---> Fe 2 O 3 4Fe + 3O 2 ---> 2Fe 2 O 3 balanced Oxidation: Iron Fe ---> Fe 3+ + 3e ‒ Electrons are removed Oxygen is added Charge increases

4. The following is one type of oxidation/ reduction reaction. 1.Balance the equation. 2.Indicate the species that are oxidized and reduced. 3.Write the half reactions for each. Fe + O 2 ---> Fe 2 O 3 4Fe + 3O 2 ---> 2Fe 2 O 3 balanced Oxidation: Iron Fe ---> Fe 3+ + 3e ‒ Electrons are removed Oxygen is added Charge increases Reduction: Oxygen O 0 + 2e ‒ ---> O 2 ‒ Electrons are added Charge decreases

5. Half Reactions: Fe 0 ---> Fe 3+ + 3e ‒ O 0 + 2e ‒ ---> O 2 ‒ Multiply coefficients through so that electrons cancel. 2Fe 0 ---> 2Fe 3+ + 6e ‒ 3 O 0 + 6e ‒ ---> 3 O 2 ‒ After electrons are cancelled: 2Fe 0 ---> 2Fe 3+ 3 O 0 ---> 3 O 2 ‒ Change elemental oxygen to diatomic, elemental. 2Fe 0 ---> 2Fe 3+ 1½ O 2 0 ---> 3 O 2 ‒ Multiply coefficients through so that they are whole numbers 4Fe 0 ---> 4Fe 3+ 3 O 2 0 ---> 6 O 2 ‒ Combine. 4Fe + 3 O 2 ---> 4Fe 3+ 6 O 2 ‒ Combine ions to make a compound, adjust coefficient. 4Fe + 3 O 2 ---> 2Fe 2 O 3

6. (2 – single replacement) Another type of oxidation/ reduction reaction is as follows. 1.Balance the equation. 2.Indicate the species that are oxidized and reduced. 3.Write the half reactions for each. Fe (s) + CuSO 4(aq) ---> FeSO 4(aq) + Cu (s)

7. (2 – single replacement) Another type of oxidation/ reduction reaction is as follows. 1.Balance the equation. 2.Indicate the species that are oxidized and reduced. 3.Write the half reactions for each. Fe (s) + CuSO 4(aq) ---> FeSO 4(aq) + Cu (s) Balanced!