1.1 Oxidation Numbers

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  • Oxidation Numbers
    • The oxidation number of an element is always 0
      • H2
      • 02
      • Mg
      • Na
    • In a compound the overall oxidation number is equal to 0
      • CO2 = the oxidation number overall is 0
        • (The oxygen is -2 so because there's two of the the oxidation number of carbon must be +4 to cancel it out and make 0)
    • In an ion the sum equals the overall charge
      • NO3- the overall oxidation number is equal to -1
        • Oxygen is -2 , and as there's 3 oxygen's they equal -6. Nitrogen is therefore +5 as -6 + 5 =-1
    • Oxygen's oxidation number is always -2, except for when with fluorine or in peroxides
      • H2O2  = The oxidation number of oxygen is -1 as hydrogen is always  +1 so in order to get an overall number of 0 oxygen must be +1
    • Hydrogen's oxidation number is always +1, except for in metal hydrides
      • NaH = Hydrogen must be -1 and Sodium is +1

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