Cambridge IGCSE·Co-ordinated Sciences 0654·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
1115 Cambridge IGCSE 0654 chemistry past paper questions on chemistry of the environment, organised by subtopic. Pick a subtopic to start practising.
About chemistry of the environment on IGCSE 0654
Water, air quality, the greenhouse effect, fertilisers and atmospheric pollutants.