Learning objective

Identify the makeup of clean, dry air, which consists of about 78% nitrogen, 21% oxygen, and a small amount of noble gases and carbon dioxide.

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Exam focus

Cambridge IGCSE ChemistryChemistry of the environmentCore content

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Quick explanation

This point belongs to Air quality and climate, especially Air quality and climate outcomes.
You need to be able to identify the makeup of clean, dry air, which consists of about 78% nitrogen, 21% oxygen, and a small amount of noble gases and carbon dioxide.
The key ideas to know are State.
Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

State

Why it matters

This objective helps connect Air quality and climate outcomes to exam-style questions, flashcards, and revision notes for Air quality and climate.

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Flashcards10 linked cards

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Practice Questions7 linked questions

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Paper 3Theory (Core)1 marks

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
Aim for approximately 1 distinct marking point.
[1]

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