Question

Some chemicals can be both useful and harmful to us.

Answer 1

very true

Answer 2

i mean do you agree with that? and why?

Answer 3

http://www.dhmo.org/facts.html

Answer 4

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 :)

Answer 5

HCl, harmful if you spill it on your skin, useful for neutralizing very basic solutions.

Answer 6

mybe harmful,but many chemicals are usefull if we can use it well :)