Separation TechniquesHoward County Public School Sysem分离技术霍华德县公立学校系统
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1、Separation TechniquesThese techniques are ONLY for mixtures what is true about the properties of substances in a mixture?What are the most common techniques?lFiltrationlDistillation lCrystallizationlChromatographyFiltrationlFiltration is used to separate the solid and liquid parts of a mixture.lThis
2、 may be used to separate something that is water-soluble from something that is not.lHowever, it may NOT be used to separate a solution, such as salt water.lSince the salt is dissolved in the water, it will go through the filter unchanged.FiltrationDistillationlDistillation uses the fact that differ
3、ent substances have different boiling points.lIn a distillation, the substance with the lower boiling point boils “off”, leaving the substance with the higher boiling point behind.lThe first substance becomes a gas, is cooled, becomes a liquid again, and is collected.lA second liquid or a solid may
4、be left behind.CrystallizationlCrystallization is the formation of solid crystals that precipitate out of a solution.lThis may happen with:ChromatographylA solution can be separated by letting it flow through a stationary substance.lDifferent substances (the mobile “phase”) will move at different rates through the stationary “phase”.lThere are many, many types of chromatography:A Gas ChromatographTwo Paper Chromatographs
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