REDOX

  • Created by: Nataliagx
  • Created on: 31-01-19 10:19
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  • Oxidation & Reduction
    • OXIDATION
      • LOSS of electron
      • GAIN of oxygen
      • OXIDISING AGENT
        • substance which OXIDISES something else
        • GIVES OXYGEN to another  substance
        • REMOVES HYDROGEN
        • potassium dichromate
        • dilute sulphuric acid
        • TAKES ELECTRONS from other substances
          • GAINS ELECTRONS
            • oxidising agents are REDUCED
      • LOSS of hydrogen
    • REDUCTION
      • GAIN electron
      • LOSS of oxygen
      • REDUCING AGENT
        • REDUCES another substance
        • REMOVES OXYGEN from another substance
        • ADDS HYDROGEN
        • NaBH4
        • GIVES ELECTRONS to other substances
          • LOSES ELECTRONS
            • reducing agents are OXIDISED
      • GAIN of hydrogen
    • OXIDATION STATE
      • total no. electrons removed from an element to get to its present state.
        • OX: increase in oxidation state
          • OXIDATION
            • LOSS of electron
            • GAIN of oxygen
            • OXIDISING AGENT
              • substance which OXIDISES something else
              • GIVES OXYGEN to another  substance
              • REMOVES HYDROGEN
              • potassium dichromate
              • dilute sulphuric acid
              • TAKES ELECTRONS from other substances
                • GAINS ELECTRONS
                  • oxidising agents are REDUCED
            • LOSS of hydrogen
        • RED: decrease in oxidation state
          • REDUCTION
            • GAIN electron
            • LOSS of oxygen
            • REDUCING AGENT
              • REDUCES another substance
              • REMOVES OXYGEN from another substance
              • ADDS HYDROGEN
              • NaBH4
              • GIVES ELECTRONS to other substances
                • LOSES ELECTRONS
                  • reducing agents are OXIDISED
            • GAIN of hydrogen
        • RULES
          • element= 0
          • sum of compound = 0
          • sum of ion = charge of ion
          • the most electronegative element= negative ox state
          • the least electronegative element= positive ox state
          • group 1= +1
          • group 2 = +2
          • oxygen= -2, unless in peroxide= -1
          • Cl & Fl = -1 but Cl changes
          • H= +1 unless metal hydrides= -1
        • when an oxidation state changes by 1 = 1 electron has been transferred
          • If  an oxidation state falls by 2 = gained 2 electrons.
            • REDUCED
            • another substance has lost 2 electrons
              • OXIDISED
    • disproportionation
      • where a single substance is both oxidised and reduced.

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