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9. Chemistry of the atmosphere
9.1
The Earth's early atmosphere and how it changed
The composition of the Earth's early atmosphere from volcanic activity, how the oceans formed, how carbon dioxide decreased and oxygen increased over billions of years, and the composition of the atmosphere today.
AQA
Edexcel
OCR
6 questions
9.2
Greenhouse gases
How greenhouse gases such as carbon dioxide, methane and water vapour keep the Earth warm by absorbing long-wavelength radiation, and the human activities that increase the amounts of these gases in the atmosphere.
AQA
Edexcel
OCR
5 questions
9.3
Climate change and the carbon footprint
The evidence linking human activities to climate change, why climate models are uncertain, the possible effects of a warmer climate, what a carbon footprint is, and how it can be reduced along with the problems in doing so.
AQA
Edexcel
OCR
5 questions
9.4
Pollutants from burning fuels
The pollutants released when fuels burn, including carbon monoxide and soot from incomplete combustion, sulfur dioxide and oxides of nitrogen that cause acid rain, and particulates, with their effects on health and the environment.
AQA
Edexcel
OCR
5 questions