GCSE Combined Science (AQA)

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Oxygen: Oxidation and Reduction

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Chemical changes Reactivity of metals

Oxygen: Oxidation and Reduction

2:16 Reactions of Metals
Spec 4.4.1.1
Previous Refraction & Wave Speed Next Electrons: Oxidation & Reduction
  • Oxidation reaction involves the gain of oxygen.
  • Example: Metals reacting with oxygen to form metal oxides.
  • Magnesium burning in air produces magnesium oxide, a white powder.
  • Balanced equation: 2Mg (solid) + O2 (gas) ��� 2MgO (solid).
  • Magnesium is oxidized as it gains oxygen.
  • Reduction reaction involves the loss of oxygen.
  • Example: Heating carbon with copper(II) oxide forms copper and CO2 gas.
  • Balanced equation: 2CuO (solid) + C (solid) ��� 2Cu (solid) + CO2 (gas).
  • Carbon bonds with oxygen from copper oxide, forming CO2 and leaving copper.
  • Carbon is oxidized as it gains oxygen.
  • Copper is reduced as it loses oxygen.
  • Oxidation and reduction can occur simultaneously.

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