Modern Chemistry - Classic Reprint Author:William Ramsay MODERN CHEMISTRY SECOND PART SYSTEMATIC CHEMISTRY CHAPTER I Methods of Preoaring Elements-Their Physical Properties. Mixtures and Compounds.-In the olden days, no distinction was drawn between a compound and a mixture. ?Indeed, all " impure " substances artificially prepared were itermed "mixta." It was only after the true idea of elements had b... more »een arrived at, and indeed not until Dalton had {formulated the laws which go by his name, that the distinction was drawn. The ultimate criterion for combination is .dcfiniteness of proportion, and this is generally connected with uniformity in properties, or homogeneity. A substance is said to be homogeneous when no one part of it differs from any other part in composition. But this may be predicated of glass, or of air, which are mixtures, and not compounds. A mixture may be homogeneous; a compound must. Again, it is usually accepted that the separation of the constituents of a mixture may be ejected by mechanical, or at feas
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