Oxidation and reduction
2 marks · NormalState what happens to a substance during oxidation and what happens to a substance during reduction in terms of oxygen transfer.
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Also accept: oxidation means a substance gains oxygen; reduction means a substance loses oxygen; gain of oxygen is oxidation; loss of oxygen is reduction
Common mistakes: mixing the definitions; defining in terms of electrons
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Marking points
B1 · 1 mark · States that oxidation is gain of oxygen.
B2 · 1 mark · States that reduction is loss of oxygen.
Worked solution
Oxidation is when a substance gains oxygen.
Reduction is when a substance loses oxygen.