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Cambridge IGCSE Combined Science practice

Paper 3 structured question: Identification of ions and gases

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Identification of ions and gases

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Paper 3Theory (Core)2 marks

Identifying gases in a laboratory setting.

Description

Gas Identification Tests

You are provided with several gases: ammonia, carbon dioxide, chlorine, hydrogen, and oxygen. Describe how you would identify each gas using appropriate tests.

  1. a

    Describe the method to identify ammonia using damp red litmus paper.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 3 structured question: Identification of ions and gases

Paper 3Theory (Core)2 marks

Description

Gas Tests

You need to identify carbon dioxide and oxygen in a lab. Explain the tests you would perform for each gas.

  1. a

    Explain the test for carbon dioxide using limewater.

    Aim for approximately 2 distinct marking points.

    [2]