Electron Transfer in Redox Reactions For problems 1 – 5, identify the oxidizing and reducing agent and identify which substances are oxidized and which substances are reduced. Write the oxidation number of each element before and after the reaction. 1. 2Mg + O2 → 2MgO a. Oxidizing agent: b. Reducing agent: c. Oxidized: d. Reduced: e. Oxidation numbers before reaction: Mg O f. Oxidation numbers after reaction: Mg O

2.Cl2 + 2NaBr → 2NaCl + Br
a. Oxidizing agent: b. Reducing agent: c. Oxidized: d. Reduced: e. Oxidation numbers before reaction: Cl Na Br f. Oxidation numbers after reaction: Cl Na Br

3. Mg + 2HCl → MgCl2 + H2 a. Oxidizing agent: b. Reducing agent: c. Oxidized: d. Reduced: e. Oxidation numbers before reaction: Mg H Cl f. Oxidation numbers after reaction: Mg H Cl

4. 2Na + 2H2O → 2NaOH + H2 a. Oxidizing agent: b. Reducing agent: c. Oxidized: d. Reduced: e. Oxidation numbers before reaction: Na H O f. Oxidation numbers after reaction: Na H O

5. Si + 2F2 → SiF4 a. Oxidizing agent: b. Reducing agent: c. Oxidized: d. Reduced:
e. Oxidation numbers before reaction: Si F f. Oxidation numbers after reaction: Si F