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Matter exists in three states: [solid], [liquid] and [gas]. All three states [expand] when heated, but [gases] do so the most. Chalk is [insoluble] in water, so you separate them by [filtration]. Salt is [soluble] in water, so you separate them by [evaporation] (to get the salt) or [distillation] (to get the water). If you have a mixture of coloured substances, you can separate them using [chromatography]..

Introduction to Chemistry

by Jpalmer1

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