Chemical substance
Chemical substance
A Chemical substance (pronunciation: /ˈkɛmɪkəl ˈsʌbstəns/) is a form of matter having constant chemical composition and characteristic properties. It cannot be separated into components by physical separation methods, i.e., without breaking chemical bonds.
Etymology
The term "chemical substance" is a combination of the words "chemical" and "substance". The word "chemical" originates from the Greek word "khēmía" meaning "alchemy", while "substance" comes from the Latin word "substantia", meaning "being or essence".
Related Terms
- Chemical compound: A chemical substance consisting of two or more different chemically bonded chemical elements, with a fixed ratio determining the composition.
- Chemical element: A species of atoms having the same number of protons in the atomic nucleus.
- Chemical reaction: A process that leads to the chemical transformation of one set of chemical substances to another.
- Chemical bond: A lasting attraction between atoms, ions or molecules that enables the formation of chemical compounds.
- Chemical property: A characteristic or behavior of a substance that may be observed when it undergoes a chemical change or reaction.
See also
External links
- Medical encyclopedia article on Chemical substance
- Wikipedia's article - Chemical substance
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