Self Assessment Checklist – Separation and Purification

Knowing the learning objectives is the first step in acing Chemistry. Master the essential concepts and apply them to interesting Chemistry questions confidently. Topical syllabus objective checklists are available here for your self-assessment. These checklists are based on Cambridge O-level Syllabus. Conduct self assessment when you revise. Tick against objectives that you can confidently say ‘I Can Do It’. Revise objectives that you are unsure of. Knowing what you need to know builds confidence in tackling questions. 

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Self Assessment Checklist - Separation and Purification

  I Can Do This!
aExplain the difference between a pure substance and a mixture.
bExplain the difference between a solvent and a solute.

Describe methods of separation and purification for the components of mixtures, to include:
c(i)use of a suitable solvent, filtration and crystallisation or evaporation to separate and purify mixtures of a solid and a liquid,
c(ii)sublimation to separate and purify mixtures of solids,
c(iii)distillation to separate and purify a solvent from a solution,
c(iv)fractional distillation to separate and purify mixtures of miscible liquids with different boiling points,
c(v)use of a separating funnel to separate and purify mixtures of immiscible liquids,
c(vi)paper chromatography to separate two or more components that dissolve in the same solvent.
dSuggest suitable separation and purification methods, given information about the substances involved in the following types of mixtures:
d(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.
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