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Learning objective

State and apply the formula for Rf, where the distance traveled by substance R is equal to the distance traveled by the solvent.

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  • Read the explanation.
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  • Practise with linked questions.
Cambridge IGCSE ChemistryExperimental techniques and chemical analysisSupplement content

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Quick explanation

State and apply the formula for Rf, where the distance traveled by substance R is equal to the distance traveled by the solvent

  • This point belongs to Chromatography, especially Chromatography outcomes.
  • You need to be able to state and apply the formula for Rf, where the distance traveled by substance R is equal to the distance traveled by the solvent.
  • The key ideas to know are State, Use, and Calculate.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

StateUseCalculate

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This objective helps connect Chromatography outcomes to exam-style questions, flashcards, and revision notes for Chromatography.

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Paper 4 structured question: Chromatography

Paper 4Theory (Extended)1 marks

Description

Chromatography Experiment

In a chromatography experiment, a mixture of dyes is placed on a paper strip. The strip is then placed in a solvent, which travels up the paper, carrying the dyes with it.

  1. a

    State the formula for calculating Rf values.

    Aim for approximately 1 distinct marking point.

    [1]
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