+ Separation Methods. + Separating Mixtures Substances in a mixture are physically combined, so processes bases on differences in physical properties.

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Presentation transcript:

+ Separation Methods

+ Separating Mixtures Substances in a mixture are physically combined, so processes bases on differences in physical properties are used to separate component Numerous techniques have been developed to separate mixtures to study components Filtration Distillation Crystallization Chromatography Evaporation Magnetism

+ Filtration Used to separate heterogeneous mixtures composed of solids and liquids Uses a porous barrier to separate the solid from the liquid Liquid passes through leaving the solid in the filter paper

+ Distillation Used to separate homogeneous mixtures Based on differences in boiling points of substances involved

+ Crystallization Separation technique that results in the formation of pure solid particles from a solution containing the dissolved substance As one substance evaporates, the dissolved substance comes out of solution and collects as crystals Produces highly pure solids Rocky candy is an example of this

+ Chromatography Separates components of a mixture based on ability of each component to be drawn across the surface of another material Mixture is usually liquid and is usually drawn across chromatography paper Separation occurs because various components travel at different rates Components with strongest attraction for paper travel the slowest

+ Evaporation Solution has particles dissolved that can be separated by the removal of the solvent. Solvent-?

+ Magnetism Magnets are used to separate a substance that can be magnetized from one that cannot. Where could this be useful?