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Literally everything is
I think plasma isn't a chemical since the elements can't form molecules. So the sun and lightning aren't chemicals.
The sun is made up of hydrogen and helium. Those are chemicals. Lightning is made up of charged electrons. But those electrons come from the atmosphere, which has a chemical composition, and the lightning wouldn't exist without the atmosphere.
Hydrogen and Helium are elements, I guess it depends on what your definition of a chemical is.
The reason I'm saying plasma is not a chemical is because it is too energetic to make atom to atom bonds which I feel is the basis for chemistry. If something cannot interact chemically I feel we should not consider it a chemical.
Please note that I did not look up any formal definitions, just expressing my reasoning for my argument. (Aka I'm probably wrong).
I would indeed define chemical elements as chemicals. Hence the name.
https://en.wikipedia.org/wiki/Chemical_element
I agree chemical elements are chemicals per the information on that page and the pages that it links to, but I'd be cautious about justifying it by the name. E.g., car parts aren't cars.
The argument I'm making is that we should not call them chemicals when they don't have the capacity to make chemical reactions.
An analogy could be how we use the word weed. We call unwanted plants weeds. If there is mint growing in your yard and you don't want it, it's a weed. If you sell your house and the next owner likes it that mint is not a weed anymore. It's still mint (element) but no longer a weed (chemical).
Plasma is not a chemical in the same way that liquid is not a chemical. It’s one of the states of matter.
Plasma
You make a good point. I should have said "things in the plasma state" should not be considered chemicals.
plasma is not a chemical because it's a condition where typically no chemical bonds can form, it's too hot for that