Self Assessment Checklist
|Separation and Purification||I can do this!|
|(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,
|(i) use of a suitable solvent, filtration and crystallisation or evaporation
to separate and purify mixtures of a solid and a liquid,
|(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,
|(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.
|(d)||Suggest suitable separation and purification methods, given information
about the substances involved in the following types of mixtures:
|(iii) liquid-liquid (miscible and immiscible).|
|(e)||Describe paper chromatography and interpret chromatograms including
comparison with ‘known’ samples and the use of Rf values.
|(f)||Explain the need to use locating agents in the chromatography of
colourless compounds (knowledge of specific locating agent is not required).
|(g)||Deduce from the given melting point and boiling point the identities of
substances and their purity.
|(h)||Explain that the measurement of purity in substances used in everyday
life, e.g. foodstuffs and drugs, is important.