Oxygen & REDOX Reactions
- Oxidation and reduction involve the addition or removal of oxygen from a substance and are called redox reactions.
- Oxidation is a reaction in which:
- oxygen is added to an element or a compound.
- an element, ion or compound loses electrons.
- Reduction is a reaction in which:
- oxygen is removed from an element or a compound.
- an element, ion or compound gains electrons.
- Metals react with oxygen in the air to produce metal oxides.
- A common example is the reaction with red-brown copper metal to produce black copper oxide:
2Cu + O2 ⟶ 2CuO
- In this reaction copper metal has been oxidised since oxygen has been added to it.
- Another example is the reaction of zinc oxide with carbon:
ZnO + C ⟶ Zn + CO
- In this reaction the zinc oxide has been reduced since it has lost oxygen. The carbon atom has been oxidised since it has gained oxygen.
AQA GCSE Chemistry Notes
Want to aim for a Level 9?
See if you’ve got what it takes. Test yourself with our topic questions.
More AQA GCSE (9-1) Chemistry Revision Resources
Morgan’s passion for the Periodic Table begun on his 10th birthday when he received his first Chemistry set. After studying the subject at university he went on to become a fully fledged Chemistry teacher, and now works in an international school in Madrid! In his spare time he helps create our fantastic resources to help you ace your exams.