Skip to content

Course home

3.2 Methods of separating and purifying substances

3.2 Methods of separating and purifying substances

EasyMediumHard
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162
Question 29

A student is separating the photosynthetic pigments from a spinach leaf extract using thin-layer chromatography (TLC). After spotting the extract on the silica gel plate, they place it inside a beaker containing a mobile phase of petroleum ether and acetone. The student ensures that the beaker is sealed with a watch glass on top.

Explain why placing a lid on the beaker is necessary for the chromatography to run successfully.

[1]
Markscheme

3.2 Methods of separating and purifying substances Questions

  1. GCSE
  2. /Chemistry
  3. /3.2 Methods of separating and purifying substances

107 exam-style questions on Edexcel GCSE Chemistry 3.2 Methods of separating and purifying substances, covering 3.2.1 Pure substances and mixtures, 3.2.2 Techniques for separating mixtures, 3.2.3 Paper chromatography and Rf values, and 3.2.4 Making water potable. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank