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ZIMSEC O-Level Chemistry

Separation techniques (Form 4)

Separation techniques (Form 4) in ZIMSEC O-Level Chemistry: what the syllabus expects you to know, the learning objectives and how to practise.
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Overview

Form 4 (competency matrix 8.17.3): fractional distillation, steam distillation, paper and thin-layer chromatography and Rf values.

Learning objectives

What the syllabus expects you to be able to do.

  1. 7.1.1.7Describe the principles of fractional distillation and steam distillation.
  2. 7.1.1.8Describe paper and thin-layer chromatography and calculate Rf values.

Lessons

  • Fractional distillation and steam distillation

    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 4): sample question

1 mark

A mixture of ethanol (boiling point 78 ∘C78\ ^\circ\text{C}) and water (boiling point 100 ∘C100\ ^\circ\text{C}) is fractionally distilled. Which liquid is collected first, and why?

Choose one answer

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