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The basic principle of filtration, evaporation, distillation, sublimation, separating funnel, centrifugation?

My teacher have asked me to write the principles of the above mentioned separating techniques and also of chromatography, fractional distillation and crystallisation. She said us to write the purpose EACH of these techniques in 2-4 lines. I am of class 9. I know the answers but I dont know how to put them in words. Please help me.

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The basic principle of the above methods is that all of them separate different components. They do so by using two immiscible liquid phases so as to find the density of the liquids. Read more about these techniques and the procedure involved at http://www.elateafrica.org/elate/chemistry/separation/separation.html.

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Thanks for your help!! :) :)
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Unfortunately this answer is totally wrong, as all of her answers are .
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Okay, so as you already know the answers, then why don't you put all these answers, in your own words, in the comments and I'm sure that one of our community members will be so kind to give you a hand with putting them into correct sentences. I'd also advice you to take care of your grammatical issues...

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Some examples: Filtration separates materials by trapping particles, allowing liquids to pass and retaining the suspended solids. Evaporation separates materials by evaporating one liquid at its vapor point and retaining all of the other components in their liquid or solid phase. Sublimation separates materials by allowing one to evaporate from the solid phase, leaving the others behind. Distillation separated materials by evaporating one and then condensing it to recover it in its pure form.

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