AS 91167 · 3 credits · Internal
Oxidation-reduction
Demonstrate understanding of oxidation-reduction
Study with Coach
Save your actual school result to count your credits.
Oxidation-reduction (redox) is about understanding how electrons are transferred between chemicals when they react. You need to show you can identify and explain these electron transfers using oxidation numbers, half-equations, and observations of what happens. This standard tests whether you understand the chemistry behind what you see happening in redox reactions.
What to do, grades and common mistakes
- ·Identify oxidation numbers in compounds and ions
- ·Describe which substance is oxidised and which is reduced in a reaction using electron transfer
- ·Name oxidants and reductants (the chemicals that cause the changes)
- ·Write balanced half-equations showing electron loss and gain separately
- ·Write overall balanced redox equations and explain them using observations and chemical vocabulary
You describe oxidation-reduction reactions, identify oxidants and reductants, assign oxidation numbers correctly, and write balanced half-equations and overall equations using proper chemistry language.
You explain the links between what you observe happening, the oxidation numbers, and what the equations show—making clear connections between the theory and the practical evidence.