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Khan Academy Site looks excellent as far as I can see its a not for profit organisation providing free educational resources and it looks like you can earn badges and points for use or just research - not sure what age its aimed at but sure it will be som
OERs and Open Online Courses by Stephen Downes show different free online college courses. This would be a great tool to look at Chemistry notes, tutorials, quizzes to help clarify the material about Chemical Reactions.
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