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.
Letâs break this down: A chemical is any substance that can be defined by its atomic or molecular composition. That covers a lot of ground! Any element is a chemical, an element being any substance that can be defined by a single atom. Thus hydrogen (H) and oxygen (O) are chemicals. Any compound is also a chemical, a compound being any substance defined by two or more bonded atoms. Thus water (H2O), consisting of bonded hydrogen and oxygen, is a chemical.