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Chemistry: Metals and Organic Chemistry
Quick questions on The atmosphere and air pollution: N(A)-Level Combined Science Chemistry
3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is the composition of clean air?Show answer
Clean dry air is a mixture of gases, mostly:
What are common air pollutants?Show answer
Burning fuels, especially fossil fuels, releases pollutants:
What is the greenhouse effect?Show answer
Some gases in the atmosphere, called greenhouse gases (mainly carbon dioxide and methane), trap heat. They let the Sun's energy through to warm the Earth, but they absorb some of the heat that the warm Earth radiates back out, stopping it escaping to space. This keeps the planet warm enough to live on. Burning fossil fuels adds extra carbon dioxide, strengthening the effect and causing global warming and climate change.
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