AQA · Chemistry · 8462
GCSE Chemistry (AQA): Greenhouse Gases & Climate Change
Topic 9 — Chemistry of the Atmosphere. Generated from the caption track of Cognito's lesson video "GCSE Chemistry - Greenhouse Gases & Climate Change (2027/28 exams)"; each card deep-links to the moment in the video it came from. Lesson 9.02 of Cognito's AQA GCSE Combined Science (Trilogy) and Chemistry course (Higher tier), filed under AQA Chemistry 8462. Teaching by Cognito — https://cognitoedu.org/coursesubtopic/c2-gcse-aqa-h-c_9.02.
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What is the difference between weather and climate?
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Weather is the daily conditions in a particular place; climate is long-term weather patterns across the whole planet.
Name three greenhouse gases.
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Carbon dioxide, methane and water vapour.
Give two reasons why global warming causes sea levels to rise.
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Melting ice flows into the oceans, and ocean water expands as it warms, increasing its volume.
What happens to the wavelength of radiation when the Earth's surface re-emits absorbed solar energy?
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It is re-emitted as longer-wavelength radiation.
Give two human activities that are increasing atmospheric carbon dioxide levels.
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Burning fossil fuels and deforestation.
In what form does energy from the Sun reach the Earth's surface?
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Short-wavelength radiation.
Give two human-linked sources of rising atmospheric methane.
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Methane produced by farm animals during digestion, and waste decomposed by microorganisms.
Why does deforestation raise atmospheric carbon dioxide levels?
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Fewer trees means less photosynthesis, and photosynthesis removes carbon dioxide from the atmosphere.
Why do greenhouse gases keep heat energy close to the Earth?
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They absorb long-wavelength radiation and re-emit it in random directions, so much of it returns towards Earth instead of escaping to space.
How is climate change expected to affect biodiversity?
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Biodiversity is likely to fall dramatically, because many species cannot adapt or migrate fast enough as temperature and rainfall patterns change.
Why is it hard for scientists to model the consequences of global warming?
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There are too many variables to take into account.
The warming caused by gases absorbing and re-emitting long-wavelength radiation in the atmosphere is called the ?.
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greenhouse effect
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