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==Key Stage 4 Foundation==
===Meaning===
'''Oxidation''' is when a [[metal]] gains one or more [[Oxygen]] [[atom]]s to become a [[Metal Oxide|metal oxide]].
===About Oxidation===
: [[Oxidation]] takes place in [[Displacement Reaction|displacement reactions]] involving [[Metal Oxide|metal oxides]].
In the following '''redox reaction''':
: [[Aluminium]] + [[Iron Oxide]] → [[Aluminium Oxide]] + [[Iron]]
: <chem>2Al+Fe2O3->Al2O3+2Fe</chem>
The [[Aluminium]] is [[Oxidation|oxidised]] because it gains the [[Oxygen]] [[atom]]s.
==Key Stage 4 Higher==
===Meaning===
'''Oxidation''' is when a [[metal]] loses [[electron]]s to become a [[Positive Ion|positive ion]].
===About Oxidation===
: '''Oxidation''' takes place in [[Displacement Reaction|displacement reactions]].
In the following '''redox reaction''':
: [[Magnesium]] + [[Copper II Chloride]] → [[Magnesium Chloride]] + [[Copper]]
: [[Oxidation]] of [[Magnesium]]: <chem>Mg - 2e^- -> Mg^2+</chem>
The [[Magnesium]] is [[Reduction|reduced]] because it loses [[electron]]s.