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Cambridge IGCSE Chemistry practice

Paper 3 structured question: Water

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Water

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Paper 3Theory (Core)3 marks

Understanding the importance of water purity in chemical reactions.

Description

Water Purity in Chemistry

The purity of water used in chemical reactions can significantly impact the outcomes. Distilled water is often recommended for its lack of impurities, while tap water may introduce variables that affect results.

  1. a

    Explain why using distilled water is crucial in chemical experiments.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 3 structured question: Water

Paper 3Theory (Core)1 marks

Description

Comparison of Water Types

In a laboratory setting, two types of water are commonly used: distilled water and tap water. Distilled water is produced through distillation, while tap water contains various dissolved minerals and chemicals.

  1. a

    State one reason why distilled water is preferred in experiments over tap water.

    Aim for approximately 1 distinct marking point.

    [1]