Cambridge IGCSE Combined Science practice

Paper 4 structured question: Preparation of salts

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

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Paper

Marks

Topic

Preparation of salts

Exam-style question

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Paper 4Theory (Extended)3 marks

Preparation of insoluble salts in a laboratory setting.

Description

When solutions of barium chloride and sodium sulfate are mixed, a white precipitate forms.

a
Describe the process of preparing barium sulfate through precipitation.
Your answer
Aim for approximately 3 distinct marking points.
[3]

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Paper 4Theory (Extended)4 marks

Description

When two soluble salts are mixed, an insoluble salt may form as a precipitate.

a
Explain the significance of precipitation reactions in chemistry.
Your answer
Aim for approximately 4 distinct marking points.
[4]