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Learning objective

Explain that impurities change the melting point and boiling point of a substance.

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Topic

Purity, formulations and chromatography

Subtopic

Pure substances

Aqa Gcse ChemistryChemical analysis

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Quick explanation

Explain that impurities change the melting point and boiling point of a substance

  • This point belongs to Purity, formulations and chromatography, especially Pure substances.
  • You need to be able to explain that impurities change the melting point and boiling point of a substance.
  • The key ideas to know are melting point and boiling point.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

melting pointboiling point

Why it matters

This objective helps connect Pure substances to exam-style questions, flashcards, and revision notes for Purity, formulations and chromatography.

Quick student answer

How do you explain impurities change the melting point and boiling point of a substance?

Direct answer

In Chemistry, this page helps you answer questions about impurities change the melting point and boiling point of a substance within Purity, formulations and chromatography. Focus on the key process, correct scientific terms, and how the idea links to exam-style questions. Key terms to check are Melting point depression and Boiling point elevation.

Key terms

  • Melting point depression: The lowering of a substance’s melting point caused by the presence of impurities.
  • Boiling point elevation: The increase in a substance’s boiling point caused by the presence of impurities.

Common trap

Impurities and Melting/Boiling Points: Remember that impurities can change both the melting point and boiling point of a substance, causing them to be lower than those of the pure substance.

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