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Redox o h
 

Redox o h

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    Redox o h Redox o h Presentation Transcript

    • Redox Reactions What is the meaning of REDOX? R E D O X Ox idation Red uction
    • Examples of Redox Reactions which occur in daily life
      • Combustion
      • Corrosion/Rusting
      • Photosynthesis
      • Respiration
    •  
    • Defn 1 (In terms of oxygen) Oxidation = addition/gain of oxygen A substance that gains oxygen is said to be oxidised. Reduction = removal/loss of oxygen. A substance that loses oxygen is said to be reduced.
    • Example based on Defn 1 (In terms of oxygen)
      • Zn + PbO -> ZnO + Pb
      • Zinc (Zn) is oxidised because it gains oxygen to form zinc oxide .
      • Lead (II) oxide (PbO) is reduced because it loses oxygen to form lead .
      When one substance is oxidised, another substance must be reduced. Oxidation and reduction take place at the same time. Such reactions are called REDOX reactions.
    • Example based on Defn 1 (In terms of oxygen) 2. Fe 2 O 3 + 3CO -> 2Fe + 3CO 2 Carbon monoxide (CO) is oxidised. Iron (III) oxide (Fe 2 O 3 ) is reduced.
    • Defn 2 (In terms of hydrogen) Oxidation = removal/loss of hydrogen A substance that loses hydrogen is said to be oxidised. Reduction = addition/gain of hydrogen. A substance that gains hydrogen is said to be reduced.
      • H 2 S + Cl 2 -> 2HCl + S
      • The substance oxidised is
      • h ydrogen sulfide (H 2 S) because it loses hydrogen to form sulfur .
      • The substance reduced is
      • c hlorine (Cl 2 ) because it gains hydrogen to form hydrogen chloride .
      • 2. CH 4 + Cl 2 -> CH 3 Cl + HCl
      • Substance oxidised is methane (CH 4 ).
      • Substance reduced is chlorine (Cl 2 ).
      Example based on Defn 2 (In terms of hydrogen)