Question 1 — IGCSE 0653 Mar 2024 Paper 12 Q23
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Correct answer: C
Cambridge IGCSE·Combined Sciences 0653·Chemistry
Chemistry Of The Environment
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 — Chemistry of the Environment
9 Cambridge IGCSE 0653 Combined Sciences past paper questions on chemistry of the environment, across Theory, Multiple Choice and Alternative to Practical.
About Chemistry of the Environment on IGCSE 0653
Chemistry of the environment covers the treatment of drinking water, air quality, and human impacts on the atmosphere. Students must understand the chemistry behind acid rain, the greenhouse effect and water purification.
What's covered:
- Water treatment: sedimentation, filtration, chlorination
- Air composition: nitrogen, oxygen, noble gases
- Greenhouse effect: CO₂ and methane
- Acid rain: sulfur dioxide and nitrogen oxides
- Ozone layer depletion
- Rusting and corrosion in context
Multiple choice
Chemistry of the Environment — Core MCQ4 · Paper 1
Question 2 — IGCSE 0653 Mar 2024 Paper 12 Q24
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Correct answer: A
Question 3 — IGCSE 0653 Mar 2024 Paper 12 Q25
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Correct answer: D
Question 4 — IGCSE 0653 Mar 2024 Paper 12 Q26
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Correct answer: D
Chemistry of the Environment — Extended MCQ5 · Paper 2
Question 1 — IGCSE 0653 Mar 2023 Paper 22 Q26
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Correct answer: A
Question 2 — IGCSE 0653 Mar 2023 Paper 22 Q27
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Correct answer: C
Question 3 — IGCSE 0653 Mar 2023 Paper 22 Q28
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Correct answer: C
Question 4 — IGCSE 0653 May/Jun 2023 Paper 23 Q24
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Correct answer: A
Question 5 — IGCSE 0653 May/Jun 2023 Paper 23 Q25
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Correct answer: B
All Chemistry of the Environment questions in this collection
| Type | Level | Paper | Session | Q# | Marks | Answer / key |
|---|---|---|---|---|---|---|
| MCQ | Core | Paper 12 | Mar 2024 | Q23 | 1 mark | C |
| MCQ | Core | Paper 12 | Mar 2024 | Q24 | 1 mark | A |
| MCQ | Core | Paper 12 | Mar 2024 | Q25 | 1 mark | D |
| MCQ | Core | Paper 12 | Mar 2024 | Q26 | 1 mark | D |
| MCQ | Extended | Paper 22 | Mar 2023 | Q26 | 1 mark | A |
| MCQ | Extended | Paper 22 | Mar 2023 | Q27 | 1 mark | C |
| MCQ | Extended | Paper 22 | Mar 2023 | Q28 | 1 mark | C |
| MCQ | Extended | Paper 23 | May/Jun 2023 | Q24 | 1 mark | A |
| MCQ | Extended | Paper 23 | May/Jun 2023 | Q25 | 1 mark | B |