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Paper 2
Chemistry of the Atmosphere
Both
CO₂, methane, and water vapor trap infrared radiation.
Key Facts
- Carbon monoxide is toxic because it binds to hemoglobin.
- NOx contributes to acid rain and photochemical smog.
Topics Covered
Earth Atmosphere
What you need to know
- •Early atmosphere was CO2 and water vapor.
- •Photosynthesis increased oxygen levels.
Exam Tips
- Link changes to living organisms.
Greenhouse Gases
What you need to know
- •CO2, methane, and water vapor trap infrared radiation.
- •Human activity increases greenhouse gases.
Exam Tips
- Give one effect and one cause for 4 marks.
Key Terms
Greenhouse gas
Gas that absorbs infrared radiation.
Carbon monoxide
Poisonous gas produced by incomplete combustion.
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Common Exam Questions
Explain why sulfur dioxide causes acid rain.
3 marksmediumPaper 2
Model Answer
SO2 dissolves in water to form acidic solutions that fall as acid rain and damage ecosystems.
What examiners want to see
- ✓Mention dissolution and acidity.
- ✓Link to impact.
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