We all know chemistry is not everybody's biggest thing but we have to get through with that subject to understand chemistry when Environmental issues occur
The Khan academy is a very useful web site to get some support at chemistry. You will find video clips about periodic table, ionic and covalent bonds, balancing chemical equations, the mole & the Avogadro's number and so on. This web site is also helpful at maths and biology. Have a look at khan academy and get your own opinion about it.
http://www.khanacademy.org/#Chemistry
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