My definition of chemistry is mixed in with physics to me, its under the same flag. On the chemistry side, you're looking at how stuff interacts on the atomic level and below, and physics is more on a macro scale and deals more with electromagnetics and such. I think they're linked together with a different focus of study. So stuff that I think has a more physics take on it (infrared for instance) goes into the general forum and stuff that deals more with atomic interaction goes into the chemistry forum. Just my .02