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A mixture differs from a chemical compound in the following respects.
  1. The constituents may be separated by suitable physical and mechanical means.
  2. Most mixtures may be made in all proportions; in the case of solutions which may be regarded as molecular mixtures, there are often limits of solubility.
  3. No heat effect (except in the case of solutions) is produced on formation; the formation of chemical compounds is invariably accompanied by the evolution or absorption of energy in the form of heat.
  4. The properties of a mixture are an aggregate of the properties of the constituents, whereas a compound has individual properties, often quite unlike those of the component elements.

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