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Compound
Compounds are made up of more than one type of atom, chemically bonded together Eg H2O
Element
Elements are made up of one type of atom. They cannot be broken down chemically into a simpler substance
Mixture
Mixtures are made up of atom, NOT chemically bonded together pure
Pure substance
A pure substance has a specific, sharp boiling and melting point. Impurities can change the boiling and melting point eg, increase the boiling point and decrease melting point