This achievement standard involves describing oxidation-reduction processes.

Processes involve reactions and calculations, which may include electrochemical cells and their properties, the use of reduction potentials, and spontaneity of oxidation-reduction reactions.

Calculations may include determination of oxidation numbers, mole ratios and those related to electrochemical cells.

• Knowledge of appearance and state of the following reactants and the product to which they are converted in an oxidation-reduction reaction is required.
• Oxidants will be limited to: O₂, Cl₂, I₂, Fe³⁺, dilute acid (with metals), H₂O₂, MnO₄^– (reacting in acidic, basic or neutral conditions), Cu²⁺, Cr₂O₇^2–/H⁺, OCl^–, concentrated HNO₃, IO₃^–, MnO₂.
• Reductants will be limited to: metals, C, CO, H₂, Fe²⁺, Br^–, I^–, H₂S, SO₂, SO₃^2–, S₂O₃^2–, H₂O₂, H₂C₂O₄.
• Appropriate information relating to other oxidants or reductants will be provided.