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- Chemistry is a science concerned with the
- composition of matter (gas, liquid, or solid)
- and of the changes that take place in it
- under certain conditions. Solids, liquids and
- gases are composed of minute particles termed
- molecules, which are constantly moving, and
- may be further divided into atoms. Molecules
- that contain atoms of one kind only are known
- as elements. Chemical compounds are produced
- by a chemical action that alters the
- arrangement of the atoms in the reacting
- molecules. When substances are brought
- together without changing their molecular
- structures they are said to be mixtures.
-
- Subject by: Russell Webb
-