Cambridge IGCSE Chemistry practice

Paper 3 structured question: Separation and purification

Try the question first, then check the answer and practise the same topic again.

At a glance

Paper

Marks

Topic

Separation and purification

Exam-style question

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Paper 3Theory (Core)1 marks

A student measures the melting point of a sample and finds it to be 45°C, while the known melting point of the pure substance is 50°C.

Description

The student suspects that the sample may contain impurities.

a
State the effect of impurities on the melting point of a substance.
Your answer
Aim for approximately 1 distinct marking point.
[1]

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Paper 3Theory (Core)2 marks

Description

The student concludes that the sample is impure.

a
Determine the effect of impurities on the boiling point of a substance.
Your answer
Aim for approximately 2 distinct marking points.
[2]