| LC control no. | sh 85022963 |
|---|---|
| Topical heading | Chemicals |
| Variant(s) | Chemical compounds Compounds, Chemical |
| See also | groups of chemicals, e.g. Acids; Alkalies; Explosives; Nitrogen compounds; and individual chemical substances, e.g. Antimony; Barium; Cupric chloride; Phenol Chemistry |
| Found in | Wikipedia, July 17, 2012 (A chemical compound is a pure chemical substance consisting of two or more different chemical elements that can be separated into simpler substances by chemical reactions; Chemical compounds can be molecular compounds held together by covalent bonds, salts held together by ionic bonds, intermetallic compounds held together by metallic bonds, or complexes held together by coordinate covalent bonds. Pure chemical elements are not considered chemical compounds, even if they consist of molecules which contain only multiple atoms of a single element (such as H₂, S₈, etc.), which are called diatomic molecules or polyatomic molecules.) Chemicool website, July 17, 2012: Chemistry dictionary (compound: A substance formed by the reaction of two or more chemical elements. The elements in a compound are present in fixed ratios. For example pure water is a compound made from two elements - hydrogen and oxygen. The fixed ratio of hydrogen to oxygen in water is 2:1. Each molecule of water contains two hydrogen atoms bonded to a single oxygen atom. Compounds can be decomposed chemically into their constituent elements.) Biology online dictionary, July 17, 2012: compound (noun, plural: compounds; (general) A material made up of two or more parts or elements. (chemistry) A substance consisting of atoms or ions of two or more elements that are chemically bonded together, e.g. carbon dioxide, a substance consisting of carbon and two oxygen atoms.) chemical ((1) A substance made up of chemical elements or produced from a chemical process (2) A drug, especially illicit or addictive drug) Dictionary.com, July 17, 2012: chemical compound ((chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight [syn: compound]) chemical (noun 1. a substance produced by or used in a chemical process. 2. chemicals, Slang. narcotic or mind-altering drugs or substances.) |
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