Simple Substance

Simple Substance

 

a homogeneous substance composed of the atoms of a chemical element; the form of a chemical element existing in a free state. The simple substances diamond, graphite, and coal, for example, are composed of atoms of the element carbon but differ in their structures and properties. Ordinary oxygen O2 and ozone O3 are composed of atoms of the element oxygen but have different molecular weights and very different properties.

The concepts of simple substance and chemical element are often confused even in contemporary literature because the chemical elements and the simple substances they form are usually known by one and the same name. Special names or letter designations are only assigned to those elements that exist in various modified forms, such as white, red, and black phosphorus and white and gray tin (β-Sn and α-Sn, respectively).

References in periodicals archive ?
BO Concept's new Simple Substance collection is full of nature-inspired accessories like this bowl (near right) that will instantly update a sideboard or coffee table.
Joint compound is a simple substance containing plaster of paris, limestone and perlite.
Whenever some accident inheres in an angel, the angel's simplicity is not corrupted; instead, the simple substance is said to enter into a larger substantial composite of which it and the accident are constituent parts.
Kant argues that we have an immediate consciousness of the self as a simple substance, and that our simplicity, substantiality, and immediate consciousness of this is necessary for personal identity.
If a simple substance is simply the sum of its accidents, then what grounds are there, after all, for claiming that the world consists of an infinity of substances each with a specific set of properties rather than that the world consists of one substance which somehow manifests all these properties?
Owner Debora Mache said: "Most people know it's a good idea - water is the most simple substance.
Fungi grows on the surface of and inside the leaves, and they break down the tougher cellulose and lignin into simple substances, such as "nitrogen, phosphorous, calcium - all these things plants need to grow," Harmon said.
Heil suggests that medium-sized objects like tomatoes are arrangements of simple substances.
It is a small treatment, which includes use of simple substances containing radioactive isotopes.
Here are pure, simple substances that express (in part) an urge to immateriality.
Although plants cannot take up nutrients until they have been broken down into simple substances - which is why chemical fertilisers act faster- bulky organic substances such as farmyard manure and vegetable compost have notable advantages.
Lignocellulosic is a very long word for really quite simple substances.