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Mixtures and Compounds Dialysis Chromatography Electrophoresis Pure Substances Mixtures and Compounds Mixtures are heterogeneous forms of matter. Mixtures are composed of variable proportions of molecules and atoms . <span>Compounds are homogeneous forms of matter. Their constituent elements (atoms and/or ions) are always present in fixed proportions (1:1 depicted here). Examples of mixtures: soil ocean water and other solutions air the cytosol of
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