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+, Cr2O72–/H+, OCl–, concentrated HNO3, IO3–, MnO2.
Reductants will be limited to: metals, C, CO, H2, Fe2+, Br–, I–, H2S, SO2, SO32–, S2O32–, H2O2, H2C2O4.
Appropriate information relating to other oxidants or reductants will be provided.