what are some chemical properties of pressure treated wood?

Your question needs some clarification. I'm not exactly sure what you are looking for. Here are a couple of site that MAY help but I'm not sure of that since I'm not sure what you are looking for. In general, chemical properties are those which occur in a chemical change.

http://www.naturalhandyman.com/iip/infxtra/infpre.html

http://www.strongtie.com/productuse/PTWoodFAQs.html