Cambridge IGCSE Chemistry practice

Paper 3 structured question: Air quality and climate

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Paper

Marks

Topic

Air quality and climate

Exam-style question

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Paper 3Theory (Core)1 marks

Understanding the composition of air is crucial for various scientific applications.

Description

Clean, dry air is composed of approximately 78% nitrogen, 21% oxygen, and trace amounts of noble gases and carbon dioxide.

a
State the two most abundant gases in clean, dry air.
Your answer
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[1]

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Paper 3Theory (Core)1 marks

Description

Air consists mainly of nitrogen and oxygen, with small amounts of other gases.

a
Identify the gas that is essential for human respiration.
Your answer
Aim for approximately 1 distinct marking point.
[1]