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Cambridge IGCSE Combined Science practice

Paper 3 structured question: Water

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Water

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Paper 3Theory (Core)2 marks

Chemical tests for water identification

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Chemical Tests for Water

Anhydrous cobalt(II) chloride and anhydrous copper(II) sulfate are used to identify the presence of water. Cobalt(II) chloride changes from blue to pink, while copper(II) sulfate changes from white to blue when water is present.

  1. a

    Describe the color changes observed when using anhydrous cobalt(II) chloride and anhydrous copper(II) sulfate to test for water.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 3 structured question: Water

Paper 3Theory (Core)4 marks

Description

Chemical Tests for Water

Anhydrous cobalt(II) chloride and anhydrous copper(II) sulfate are used to identify the presence of water. Cobalt(II) chloride changes from blue to pink, while copper(II) sulfate changes from white to blue when water is present.

  1. a

    Explain the chemical tests used to identify water using anhydrous cobalt(II) chloride and anhydrous copper(II) sulfate.

    Aim for approximately 4 distinct marking points.

    [4]