Exercise 1 — IGCSE 0654 Jun 2023 Paper 32 Q2
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Cambridge IGCSE·Co-ordinated Sciences 0654·Chemistry
Air Quality The Atmosphere
Key knowledge — Chemistry Of The Environment
Key facts & rules
- Clean dry air: ~78% N₂, ~21% O₂, ~0.04% CO₂, ~1% Ar and other noble gases.
- Acid rain: caused by SO₂ (burning fossil fuels) and NOₓ (car engines) dissolving in rainwater.
- Greenhouse effect: CO₂, CH₄, H₂O absorb infrared radiation re-emitted from Earth → warming.
- Water treatment: screening → sedimentation → filtration → chlorination.
- Hard water: contains Ca²⁺ or Mg²⁺ ions; forms scum with soap; removed by ion exchange or boiling (temporary hardness).
- Ozone layer (O₃): in stratosphere; absorbs harmful UV radiation; damaged by CFCs.
IGCSE Chemistry — Air quality & the atmosphere
43 Cambridge IGCSE 0654 questions on air quality & the atmosphere, across all three components.
About air quality & the atmosphere on IGCSE 0654
Every Cambridge IGCSE Co-ordinated Sciences 0654 question on air quality & the atmosphere (Chemistry of the environment, Chemistry), across all three exam components. Theory and alternative-to-practical come with full mark schemes; multiple choice is interactive — click an option to check it.
Theory
Air quality & the atmosphere — Core theory questions3 total · Paper 3
Exercise 2 — IGCSE 0654 Jun 2023 Paper 33 Q2
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Exercise 3 — IGCSE 0654 Nov 2023 Paper 31 Q2
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Air quality & the atmosphere — Extended theory questions5 total · Paper 4
Exercise 4 — IGCSE 0654 Nov 2025 Paper 41 Q6
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Exercise 5 — IGCSE 0654 Nov 2024 Paper 41 Q2
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Exercise 6 — IGCSE 0654 Jun 2024 Paper 42 Q11
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Multiple choice
Air quality & the atmosphere — Core multiple choice questions19 total · Paper 1
Exercise 1 — IGCSE 0654 Oct/Nov 2025 Paper 11 Q24
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Correct answer: A
Exercise 2 — IGCSE 0654 Oct/Nov 2024 Paper 11 Q27
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Correct answer: C
Exercise 3 — IGCSE 0654 Oct/Nov 2024 Paper 12 Q17
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Correct answer: B
Exercise 4 — IGCSE 0654 Oct/Nov 2024 Paper 13 Q17
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Correct answer: B
Air quality & the atmosphere — Extended multiple choice questions16 total · Paper 2
Exercise 5 — IGCSE 0654 Oct/Nov 2025 Paper 23 Q24
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Correct answer: C
Exercise 6 — IGCSE 0654 Oct/Nov 2024 Paper 21 Q20
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Correct answer: D
Exercise 7 — IGCSE 0654 Oct/Nov 2024 Paper 22 Q25
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Correct answer: B
Exercise 8 — IGCSE 0654 May/June 2023 Paper 21 Q22
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Correct answer: D