Compound is a chemistry term, which refers to a pure substance that contains two or more elements chemically combined together during a chemical reaction. It must be in a fixed composition, and can be broken down by heat during thermal decomposition or by using electricity.
There are many types of compound, like carbon dioxide (carbon and oxygen), common salt (sodium, chlorine), marble ( calcium, carbon, oxygen), copper (II) sulphate (copper, sulphur, oxygen) and hydrogen chloride (chlorine and hydrogen).
Here's a example. Water (H2O) is a compound made by joing together two atoms of hydrogen to one atom of oxygen and the ratio between them is 2:1
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