Redox reactions ?.

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Presentation transcript:

Redox reactions ?

?

Burning Magnesium in air

Oxidation is the gain of oxygen When magnesium reacts with oxygen in the air: 2Mg + O2 2MgO It is easy to see that the magnesium has gained oxygen. We state that magnesium has been OXIDISED Write the balanced chemical equation

Reduction is loss of oxygen When copper is extracted from copper (II) oxide, carbon is used to remove the oxygen 2CuO + C 2Cu + CO2 It is easy to see that oxygen has been removed from the copper (II) oxide We state that copper (II) oxide has been REDUCED Write the balanced chemical equation

Review & Fiddly stuff #1 2CuO + C 2Cu + CO2 Carbon has been OXIDISED WHY? Copper has been REDUCED WHY? We state that carbon is a reducing agent as it caused Copper to be reduced… We state that copper is an oxidising agent as it caused Carbon to be oxidised …

PbO + H2 Pb + H2O What has been OXIDISED ? What has been REDUCED ? Which is the reducing agent ? Which is the oxidising agent ? PbO + H2 Pb + H2O [2]