What is the difference between a mixture and a compound?

- Mixtures are separated by physical means, compounds can only be separated by chemical means - Substances in mixtures are not joined chemically (only joined physically) whereas in compounds, the elements are joined chemically - In a mixture, each substance retains its own properties, in a compound, the compound has different properties from the elements it contains - Mixtures do not have a set ratio of each substance whereas the ratio of the atoms of each element in a compound does not change