Cambridge IGCSE Combined Science practice

Paper 3 structured question: Air quality and climate

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

At a glance

Paper

Marks

Topic

Air quality and climate

Exam-style question

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Paper 3Theory (Core)2 marks

Understanding the composition of air is important for environmental science.

Description

Clean, dry air consists of approximately 78% nitrogen, 21% oxygen, and the remaining 1% is made up of noble gases and carbon dioxide.

a
Identify List the main components of clean, dry air and their approximate percentages.
Your answer
Aim for approximately 2 distinct marking points.
[2]

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Paper 3Theory (Core)3 marks

Description

Clean, dry air is primarily composed of nitrogen and oxygen, with trace amounts of other gases.

a
Explain Why is it important to know the composition of clean, dry air?
Your answer
Aim for approximately 3 distinct marking points.
[3]