Riot control agent. After September 11, 2001, the _____________ was established to provide a framework that provides a comprehensive national approach, applicable at all jurisdictional levels and across functional disciplines.
noun, plural: chemicals. (1) A substance made up of chemical elements or produced from a chemical process. (2) A drug, especially illicit or addictive drug. adjective. Of, relating to, or pertaining to, chemistry or a chemical substance.
A chemical substance[1] also known as a pure substance is a form of matter that has constant chemical composition and characteristic properties.[2] It cannot be separated into components by physical separation methods, i.e., without breaking chemical bonds.[3] Chemical substances can be chemical elements, chemical compounds, ions or alloys.