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Topic 9 Oxidation And Reduction Outline

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Topic 9: Oxidation and Reduction

9.1.1 Define oxidation and reduction in terms of electron loss and gain.

Oxidation is the loss of electrons o e.g. Mg(s) → Mg2+ + 2e Reduction is the gain of electrons. o e.g. Fe3+ + 3e → Fe(s)

9.1.2 Deduce the oxidation number of an element in a compound.

The sum of all oxidation numbers in a compound must add up to 0 The sum of all oxidation numbers in a polyatomic ion must add up to the charge o E.g. SO42-, sum of oxidation numbers = -2 Rules Oxidation number e.g. Atoms in elemental state

0

Al(s), Zn(s), H2, O2

Ions

Same as the charge

Mg2+ = +2 O2- = -2

Element

Same as charge on most common ion

O = -2 H = +1

9.1.3 State the names of compounds using oxidation numbers.

Oxidation number written in roman numbers Examples:

9.1.4 Deduce whether an element undergoes oxidation or reduction in reactions using oxidation numbers.

Oxidation = increase in oxidation number Reduction - decrease in oxidation number

9.2.1 Deduce simple oxidation and reduction half-equations given the species involved in a redox reaction.

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