Classify oxides as acidic, including SO2 and CO2, basic, including CuO and CaO, or amphoteric, limited to Al2O3 and ZnO, related to metallic and non-metallic character

Identify redox reactions by changes in oxidation number using: (a) the oxidation number of elements in their uncombined state is zero (b) the oxidation number of a monatomic ion is the same as the charge on the ion (c) the sum of the oxidation numbers in a compound is zero (d) the sum of the oxidation numbers in an ion is equal to the charge on the ion