I would like to know the purpose of chemicals?

i need to find out the purpose of chemicals for my sons
science homewprk

Answer:
Every thing around us is chemcals. Water is a chemical. carbondioxide we breath out and Oxygen that we breath in are cheicals. We rely on chemicals in our body for energy, digestion, hormones, blood clotting, carrying oxygen to our cells and etc.
the purpose of chemicals is so wide, because the everyhing in tis world is a chemical. If you specify the question more exactly i could help you , on the contrary i recommend you use the google with the following directions

http://en.wikipedia.org/wiki/chemistry...

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