The chemical industry comprises the companies that produce industrial chemicals. The chemical industries convert raw materials oil-- metals, air, water, natural gas and minerals-- into products. Products include chemicals to make plastic for computers, paint for cars, and medicines. Chemical engineers start with cheap, raw, natural materials, such as petrochemicals, seawater, and minerals. Amon
g the chemical classifications are basic and synthetic, agricultural, pesticides and fertilizers, organic, inorganic, and automotive.