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Learning objective

Explain how barrier methods stop rusting by preventing access to oxygen or water.

Read the explanation, check the common trap, then practise with flashcards and questions.

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  • Read the explanation.
  • Check key terms.
  • Practise with linked questions.
Cambridge IGCSE ChemistryMetalsCore content

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Quick explanation

Explain how barrier methods stop rusting by preventing access to oxygen or water

  • This point belongs to Corrosion of metals, especially Corrosion of metals outcomes.
  • You need to be able to explain how barrier methods stop rusting by preventing access to oxygen or water.
  • 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

Why it matters

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

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Paper 3 structured question: Corrosion of metals

Paper 3Theory (Core)1 marks

Description

Rusting of Iron

Iron can corrode when exposed to moisture and oxygen, leading to rust formation.

  1. a

    State one method to prevent rusting of iron.

    Aim for approximately 1 distinct marking point.

    [1]
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