Use redox equations in reactions involving acids, metals and transition-metal ions.

In the subtopic Redox equations, this AQA A-Level Chemistry 7405 learning objective focuses on use redox equations in reactions involving acids, metals and transition-metal ions. It belongs to Oxidation, reduction and redox equations, so revision should stay anchored to this exact subtopic rather than drifting into a generic GCSE-level chemistry summary. Approved keywords to use include redox equation. Reduction. means the process of decreasing the oxidation state of an element, typically involving the gain of electrons Avoid the mistake of students often confuse oxidation with reduction, thinking that both involve an increase in oxidation state; instead, remember that oxidation is defined as an increase in oxidation state, while reduction is a decrease. For example, in the reaction of zinc with copper sulfate, zinc is oxidized (its oxidation state increases from 0 to +2) and copper is reduced (its oxidation state decreases from +2 to 0) For exam answers, when using redox equations, always identify the oxidation states of all elements involved to determine the oxidising and reducing agents