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Learning objective

Explain how to assess the purity of water by measuring its melting point and boiling point.

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Cambridge IGCSE ChemistryChemistry of the environmentCore contentPractical objective

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Quick explanation

Explain how to assess the purity of water by measuring its melting point and boiling point

  • This point belongs to Water, especially Water outcomes.
  • You need to be able to explain how to assess the purity of water by measuring its melting point and boiling point.
  • The key ideas to know are Describe.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

Describe

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Paper 6 structured question: Water

Paper 6Alternative to PracticalPractical3 marks

Method

Method for Assessing Water Purity

To assess the purity of water, measure its melting point and boiling point using a thermometer. Record the temperatures accurately and compare them to the standard values of pure water.

  1. a

    Describe the method you would use to measure the melting point of water, including any variables you would control.

    Aim for approximately 3 distinct marking points.

    [3]
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