A mixture is a combination of two or more substances where each substance retains its own chemical identity and properties. Mixtures can be either homogeneous or heterogeneous based on the uniformity of their composition.
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Mixtures can be separated into their individual components by physical means such as filtration, distillation, and chromatography.
In a homogeneous mixture, the composition is uniform throughout, while in a heterogeneous mixture, the composition is not uniform.
Examples of homogeneous mixtures include saltwater and air; examples of heterogeneous mixtures include salad and granite.
The properties of a mixture are generally intermediate between those of its constituents.
Mixtures do not have a fixed composition; the proportion of components can vary.