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Learning objective

Detail the tests for identifying the following gases: (a) ammonia (NH₃) using damp red litmus paper; (b) carbon dioxide (CO₂) with limewater; (c) chlorine (Cl₂) using damp litmus paper; (d) hydrogen (H₂) with a lighted splint; (e) oxygen (O₂) using a glowing splint; (f) sulfur dioxide (SO₂) with acidified potassium manganate(VII).

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Cambridge IGCSE ChemistryExperimental techniques and chemical analysisCore content

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Quick explanation

Detail the tests for identifying the following gases: (a) ammonia (NH₃) using damp red litmus paper; (b) carbon dioxide (CO₂) with limewater; (c) chlorine (Cl₂) using damp litmus paper; (d) hydrogen (H₂) with a lighted splint; (e) oxygen (O₂) using a glowing splint; (f) sulfur dioxide (SO₂) with acidified potassium manganate(VII)

  • This point belongs to Identification of ions and gases, especially Identification of ions and gases outcomes.
  • You need to be able to detail the tests for identifying the following gases: (a) ammonia (NH₃) using damp red litmus paper; (b) carbon dioxide (CO₂) with limewater; (c) chlorine (Cl₂) using damp litmus paper; (d) hydrogen (H₂) with a lighted splint; (e) oxygen (O₂) using a glowing splint; (f) sulfur dioxide (SO₂) with acidified potassium manganate(VII).
  • The key ideas to know are Describe, Identify, and Explain.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

DescribeIdentifyExplain

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Paper 3 structured question: Identification of ions and gases

Paper 3Theory (Core)1 marks

Description

Gas Identification Tests

Describe the tests used to identify the following gases: ammonia, carbon dioxide, chlorine, hydrogen, oxygen, and sulfur dioxide.

  1. a

    State the test for ammonia (NH₃).

    Aim for approximately 1 distinct marking point.

    [1]
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