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Some chemicals can be both useful and harmful to us.

Physics
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very true
i mean do you agree with that? and why?
http://www.dhmo.org/facts.html

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Other answers:

compounds like TNT is used for both constructive and destructive purpose, element like uranium, for nuclear reactor and nuclear bomb, so it depends how you are making use of it :)
HCl, harmful if you spill it on your skin, useful for neutralizing very basic solutions.
mybe harmful,but many chemicals are usefull if we can use it well :)

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