In chemistry, a chemical substance is a form of matter that has constant chemical composition and characteristic properties. It cannot be separated into components by physical separation methods, i.e. without breaking chemical bonds. It can be solid, liquid or gas.
Chemical substances are often called 'pure' to set them apart from mixtures. A common example of a chemical substance is pure water; it has the same properties and the same ratio of hydrogen to oxygen whether it is isolated from a river or made in a laboratory. Other chemical substances commonly encountered in pure form are diamond (carbon), gold, table salt (sodium chloride) and refined sugar (sucrose). However, simple or seemingly pure substances found in nature can in fact be mixtures of chemical substances. For example, tap water may contain small amounts of dissolved sodium chloride and compounds containing iron, calcium and many other chemical substances.
Chemical substances exist as solids, liquids, gases, or plasma and may change between these phases of matter with changes in temperature or pressure. Chemical reactions convert one chemical substance into another.
Forms of energy, such as light and heat, are not considered to be matter, and thus they are not "substances" in this regard.
Read more about Chemical Substance: Definition, History, Chemical Elements, Chemical Compounds, Substances Versus Mixtures, Chemicals Versus Chemical Substances, Naming and Indexing, Isolation, Purification, Characterization, and Identification
Famous quotes containing the words chemical and/or substance:
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—Lewis Thomas (b. 1913)
“But they that hold God to be [an incorporeal substance] ... do absolutely make God to be nothing at all. But how? Were they atheists? No. For though by ignorance of the consequence they said that which was equivalent to atheism, yet in their hearts they thought God a substance ... So that this atheism by consequence is a very easy thing to be fallen into, even by the most godly men of the church.”
—Thomas Hobbes (1588–1679)