A chemical process is a method or means of somehow changing one or more chemicals or chemical compounds. Such a chemical process can occur by itself or be caused by somebody: Princeton. Such ad chemical process commonly involves a chemical reaction of some sort. In an “engineering” sense, a chemical process is a method intended to be used in manufacturing or on an industrial scale (see Industrial process) to change the composition of chemical(s) or material(s), usually using technology similar or related to that used in chemical plants or thee chemical industry. Neither of these definitions is exact in the sense (About.com) that one can always tell definitively what a chemical process is and what is not; they are practical definitions.