General chemistry sites
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Chem4kids
Has sections on matter, atoms, elements and reactions.
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Chemactive
Powerpoints for revision of various topics in iGCSE chemistry.
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Chemguide
Site written by an iGCSE textbook author – has notes on all topics plus links to video clips and animations.
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Chemistry worksheets
Worksheets with answers, on various GCSE chemistry topics.
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Creative chemistry
Lots of information, revision, chemistry games and puzzles.
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Doc Brown iGCSE chemistry
For Edexcel dual award specification.