Learning objective
Recall that the Earth's atmosphere is about 20 percent oxygen.
Read the explanation, check the common trap, then practise with flashcards and questions.
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Topic
The composition and evolution of the Earth's atmosphere
Subtopic
The proportions of different gases in the atmosphere
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Understand this objective
Quick explanation
Recall that the Earth's atmosphere is about 20 percent oxygen
- This point belongs to The composition and evolution of the Earth's atmosphere, especially The proportions of different gases in the atmosphere.
- You need to be able to recall that the Earth's atmosphere is about 20 percent oxygen.
- The key ideas to know are oxygen and atmosphere.
- Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.
Key concepts
Why it matters
This objective helps connect The proportions of different gases in the atmosphere to exam-style questions, flashcards, and revision notes for The composition and evolution of the Earth's atmosphere.
Quick student answer
What should you know about the Earth's atmosphere is about 20 percent oxygen?
Direct answer
In Chemistry, this page helps you answer questions about the Earth's atmosphere is about 20 percent oxygen within The composition and evolution of the Earth's atmosphere. Focus on the key process, correct scientific terms, and how the idea links to exam-style questions. Key terms to check are Earth's atmosphere and oxygen.
Key terms
- Earth's atmosphere: The layer of gases surrounding the Earth, composed mainly of nitrogen and oxygen.
- oxygen: A diatomic molecule (O2) that makes up about 20 percent of the Earth's atmosphere and is essential for respiration in living organisms.
Common trap
Oxygen Proportion Misunderstanding: Remember that the Earth's atmosphere is about 20 percent oxygen and 80 percent nitrogen. Use mnemonic devices or visual aids to help memorize these proportions.
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Revision notestopic notes
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Open revision notesRelated learning objectives
- Recall that the Earth's atmosphere is about 80 percent nitrogen.
The proportions of different gases in the atmosphere
- Recall that the Earth's atmosphere contains small proportions of other gases including carbon dioxide, water vapour and noble gases.
The proportions of different gases in the atmosphere
- Interpret simple data showing the proportions of gases in the atmosphere.
The proportions of different gases in the atmosphere
- Distinguish the major gases in the present atmosphere from trace atmospheric gases.
The proportions of different gases in the atmosphere
- Explain why percentage composition is useful when describing atmospheric gases.
The proportions of different gases in the atmosphere