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Oxidation Numbers

Oxidation Numbers. The oxidation number of an atom in an element is zero. E.g. Mg in Mg, O in O 2. Oxidation Numbers. The oxidation numbers of atoms in a compound add up to zero. Oxidation state of C in CO 2 ? ? – 4 = 0 ? = +4. Put the +!. Oxidation Numbers.

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Oxidation Numbers

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  1. Oxidation Numbers • The oxidation number of an atom in an element is zero. E.g. Mg in Mg, O in O2.

  2. Oxidation Numbers • The oxidation numbers of atoms in a compound add up to zero. Oxidation state of C in CO2? ? – 4 = 0 ? = +4 Put the +!

  3. Oxidation Numbers • The oxidation numbers of atoms in a compound add up to zero. Oxidation state of Mg in MgCl2? +2

  4. Oxidation Numbers • The oxidation numbers of atoms in a compound add up to zero. Oxidation state of N in NH3? -3

  5. Oxidation Numbers • The oxidation numbers of atoms in an ion add up to the charge on the ion. Oxidation state of S in SO42-? ? – 8 = -2 ? = +6

  6. Oxidation Numbers • The oxidation numbers of atoms in an ion add up to the charge on the ion. Oxidation state of S in S2-? -2

  7. Oxidation Numbers • The oxidation numbers of atoms in an ion add up to the charge on the ion. Oxidation state of N in NH4+? -3

  8. H2(g) + ½ O2(g)H2O(g) H +1 0 O 0 -2 Oxidised? Reduced? O – decrease in oxidation number H – increase in oxidation number

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