CHEMISTRY - seperating mixtures 1.3 - Flashcards in GCSE Chemistry

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Created on: 05-04-18 16:36

Seperating Mixtures

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Filtration

used to seperate an insoluble solid from a mixture - can be done using filter paper

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Crystallisation

seperates a soluble solid from a solvent i.e. a salt - heat over an evaporating dish until the point of crystallisation, then leave to evaporate at room temperature (can be used even if the salt decomposes and you can't use evaporation)

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Distillation

used to obtain a solvent with soluble solids dissolved in it - heat the solution to evaporate the solvent, which can be collected in a condenser to cool

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Mixture

made up of two or more aubstances, with no chemical bonds between them - they have no fixed composition and can be seperated through physical means

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Fractional Distillation

used to seperate mixtures of miscible liquids - the mixture is heated, and the substance with the lowest BP is collected first (you add a fractioning column because it is difficult to obtain a pure liquid, as vapours are given off first)

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Paper Chromatography

used to seperate substances from mixtures in solution, as some compounds are mroe soluble in the solvent than others

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Other cards in this set

Card 2

Front

used to seperate an insoluble solid from a mixture - can be done using filter paper

Back

Filtration

Card 3

Front

Back

Card 4

Front

used to obtain a solvent with soluble solids dissolved in it - heat the solution to evaporate the solvent, which can be collected in a condenser to cool

Back

Card 5

Front

made up of two or more aubstances, with no chemical bonds between them - they have no fixed composition and can be seperated through physical means

Back

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CHEMISTRY - seperating mixtures 1.3