Picture of a mixture and compound:
Criteria Mixture Compound
Separation The components of a mixture can be The elements in a compound can only be
separated by physical methods (e.g. separated by chemical reactions or by using
filtration. distillation or chromatography.) electricity.
Properties The chemical properties of a mixture are The physical and the chemical properties of
the same of those of its components. a compound are different from those of the
elements in the compound.
Energy change No chemical reaction takes place when A chemical reaction takes place when a
a mixture is formed - usually there is compound is formed - usually there is an
little of no energy change. energy change, e.g. the reactants get hot.
Composition The components of a mixture can be The elements in a compound are always
mixed in any proportion. combined in a fixed proportion (by mass).
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