Look at the periodic table. Can you find substances such as water, salt, sugar, calk and sand? Substances not listed in the periodic table are not elements. We all know that water is not an element because it can be broken down into hydrogen and oxygen. What then, is water?
Water, together with substances like salt, sugar, chalk, sand, carbon dioxide and plastics, belong to a group of matter known as compounds.
A compound is a pure substance containing of two or more elements which have been chemically combined.
Water for example is made up of two elements oxygen and hydrogen which have been combined during a chemical reaction the term equation may be used to describe the chemical reactions. In the case of water, the equation for its formation is written as:
Hydrogen + Oxygen= Water
These are compound!
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