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ZIMSEC O-Level Chemistry

Separation techniques (Form 3)

Separation techniques (Form 3) in ZIMSEC O-Level Chemistry: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic40 practice questions2 lessons

Overview

Form 3 (competency matrix 8.1.3): filtration, distillation, crystallisation, evaporation, and paper and thin-layer chromatography.

Learning objectives

What the syllabus expects you to be able to do.

  1. 7.1.1.3Identify methods of separating mixtures, including filtration, distillation, crystallisation, evaporation, and paper and thin-layer chromatography.
  2. 7.1.1.4Suggest a suitable separation technique from the nature of a mixture.

Lessons

  • Chromatography

    30 min

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  • Separating mixtures

    30 min

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Sample question

A sample question on this topic. Answer it, check it, then read the worked answer.

Separation techniques (Form 3): sample question

1 mark

Why must the level of the solvent be below the base line at the start of paper chromatography?

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