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===Extra Information===
{{#ev:youtube|https://www.youtube.com/watch?v=GyN2RhbhiEU}}
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/1471851346/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851346&linkCode=as2&tag=nrjc-21&linkId=3ac654f4b0da781c49c855a1af4c92ea ''Scientific theories, pages 30-1, GCSE Chemistry, Hodder, AQA '']