Self Assessment Checklist
| Separation and Purification | I can do this! | |
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| (a) | Explain the difference between a pure substance and a mixture. | |
| (b) | Explain the difference between a solvent and a solute. | |
| (c) | Describe methods of separation and purification for the components of mixtures, to include: |
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| (i) use of a suitable solvent, filtration and crystallisation or evaporation to separate and purify mixtures of a solid and a liquid, |
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| (ii) sublimation to separate and purify mixtures of solids, | ||
| (iii) distillation to separate and purify a solvent from a solution, | ||
| (iv) fractional distillation to separate and purify mixtures of miscible liquids with different boiling points, |
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| (v) use of a separating funnel to separate and purify mixtures of immiscible liquids, | ||
| (vi) paper chromatography to separate two or more components that dissolve in the same solvent. |
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| (d) | Suggest suitable separation and purification methods, given information about the substances involved in the following types of mixtures: |
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| (i) solid-solid, | ||
| (ii) solid-liquid, | ||
| (iii) liquid-liquid (miscible and immiscible). | ||
| (e) | Describe paper chromatography and interpret chromatograms including comparison with ‘known’ samples and the use of Rf values. |
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| (f) | Explain the need to use locating agents in the chromatography of colourless compounds (knowledge of specific locating agent is not required). |
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| (g) | Deduce from the given melting point and boiling point the identities of substances and their purity. |
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| (h) | Explain that the measurement of purity in substances used in everyday life, e.g. foodstuffs and drugs, is important. |
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