Oxidation Numbers The oxidation number of an atom in an element is zero. E.g. Mg in Mg, O in O 2.

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Oxidation-reduction reactions

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Presentation transcript:

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. F O-2 H+1 Cl Oxidation state of C in CO 2 ? ? – 4 = 0 ? = +4 Put the +!

Oxidation Numbers The oxidation numbers of atoms in a compound add up to zero. F O-2 H+1 Cl Oxidation state of Mg in MgCl 2 ? +2

Oxidation Numbers The oxidation numbers of atoms in a compound add up to zero. F O-2 H+1 Cl Oxidation state of N in NH 3 ? -3

Oxidation Numbers The oxidation numbers of atoms in an ion add up to the charge on the ion. F O-2 H+1 Cl Oxidation state of S in SO 4 2- ? ? – 8 = -2 ? = +6

Oxidation Numbers The oxidation numbers of atoms in an ion add up to the charge on the ion. F O-2 H+1 Cl Oxidation state of S in S 2- ? -2

Oxidation Numbers The oxidation numbers of atoms in an ion add up to the charge on the ion. F O-2 H+1 Cl Oxidation state of N in NH 4 + ? -3

H 2 (g) + ½ O 2 (g)  H 2 O(g) O H Oxidised? H – increase in oxidation number Reduced? O – decrease in oxidation number