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Cambridge IGCSE Combined Science practice

Paper 3 structured question: Water

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3

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Water

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Paper 3Theory (Core)3 marks

A student is preparing a solution for a chemical reaction.

Description

Choosing Water for Solutions

The student must decide whether to use distilled water or tap water to prepare the solution.

  1. a

    Discuss the advantages of using distilled water for preparing solutions in chemistry.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 3 structured question: Water

Paper 3Theory (Core)2 marks

Description

Use of Water in Experiments

The students have access to both tap water and distilled water for their experiments. They need to choose which type of water to use for accurate results.

  1. a

    Explain why distilled water is preferred over tap water in laboratory experiments.

    Aim for approximately 2 distinct marking points.

    [2]