1. Pertaining to OIL RIG… Mg + S  MgS 0 0 +2 -2 Magnesium is oxidized
Magnesium is oxidized
Substance in the reaction that loses electrons
Sulfur atom is reduced
Substance in the reaction that gains electrons

2. Identifying Redox Reactions
2 Al + Fe2O3  2 Fe + Al2O3
Al increases from 0 to +3, it is ______
Fe decreases from +3 to 0, it is _______
oxidized!
reduced!

3. Oxidizing and Reducing Agents
CuO + H2  Cu + H2O
Cu goes from +2 to 0
Cu is reduced, therefore CuO is called an oxidizing agent because it causes some other substance to be oxidized
H goes from 0 to +1
H is oxidized, therefore H2 is called a reducing agent because it causes some other substance to be reduced.

4. Identifying Agents in an Equation
CuO + H2  Cu + H2O
Reduction: CuO is the oxidizing agent
Oxidation: H2 is the reducing agent