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Topic 6 Redox & Electrolysis 1
Topic 6 2 Oxidation Reduction Gaining of Oxygen Loss of Oxygen Loss of Electrons increase in the oxidation number Gaining of Electrons decrease in the oxidation number Redox Reaction: reactions that involve reduction & oxidation simultaneously. Oxidizing Agent (Oxidant) Reducing Agent (Reductant) It’s a substance that oxidizes another substance and itself is reduced. It’s a substance that reduces another substance and itself is oxidized. Examples Acidified Potassium Manganate (KMnO4) Acidified Potassium Dichromate (K2Cr2O7) Chlorine Oxygen Hydrogen Peroxide Examples Hydrogen Carbon Carbon Monoxide Potassium Iodide Reactive Metals Redox in terms of Oxygen Redox in terms of Oxygen Transfer 1) Reduction of Hematite (Iron Oxide to Iron) Fe2O3 lost oxygen so it is reduced, it is the oxidizing agent. CO gained oxygen so it is oxidized, it is the reducing agent.
3 2) Burning “Combustion” of Magnesium 3) Passing Hydrogen over hot Copper (II) Oxide O2 is reduced, it’s the oxidizing agent. Mg is oxidized, it’s the reducing agent. CuO lost oxygen so it’s reduced, it’s the oxidizing agent. H2 gained oxygen so it’s oxidized, it’s the reducing agent. Black Solid (CuO) turns reddish brown (Cu) Colourless droplets of H2O appear at the end of the tube. A flame due to burning of excess unreacted H2. Observations Redox in terms of Electron Redox in terms of Electron Transfer Oxidation: loss of electrons & increase in oxidation number. Reduction: gain of electrons & decrease in oxidation number. O I L Oxidation Is Loss of Electrons R I G Reduction Is Gain of Electrons Topic 6