To general of a question. So the answer is no. Not every chemical is hazardous to plants.
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Some chemical are good for plants and some are bad - you need to tell us which you want to know about. There are some chemical (weedkillers) that are specifically designed to kill plants.
Vinegar usually kills plants within the time range of 23- 24 hours while bleach takes like 2-3 days.
These substances are called herbicides.
Herbicides/pesticides
bleach
Nonoxynol-9.
A chainsaw.
Antibiotics
I believe that it's alcohol (ethyl or rubbing- not sure which).
It is the chemical that activates pepsinogen in the stomach kills bacteria denatures proteins
Yes, chloride kills garden weeds.
becase vinegar is a
A herbicide kills weeds and an insecticide kills insects. :)
A weedkiller that kills only weeds not flowers or your precious plants.
it's when crops have been genetically modified so that it's resistant to a chemical in round up, so that when round up is sprayed on the crops, it kills the weeds but not the crops.
Salt water kills most plants!
Here's an article about soil solarization, a non-chemical way to kill weeds and prevent weed growth: http://landscaping.about.com/od/weedsdiseases/qt/killing_weeds.htm
There is a selective herbicide that only kills weeds and there is an unselective herbicide which kills everything it comes into contact with and I am not sure about the third one.
I know this sounds stupid but ... wait for it ... IT KILLS WEEDS!!! sorry if that sounds sarcastic
Chemical pollution would do it.
A chemical that kills insects
Nonoxynol-9.