Chemical


 * Chemistry — the science of chemicals
 * Chemophobia — the fear of chemicals
 * Chemotherapy — a standard medical treatment for cancer
 * Chemtrails — the conspiracy theory that airplanes are dumping "chemicals" on us instead of contrails
 * Chemically-Assisted Nuclear Reactions, a.k.a., Cold fusion
 * Chembuster, a.k.a., Cloudbusting
 * Chemical weapons