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Atmosphere
GCSE chemistry and combined chemistry
Question | Answer |
---|---|
How can oxygen be tested for? | Relights a glowing splint |
What gases made up the Earths initial atmosphere | Large amount of carbon dioxide, water vapour, small amounts of other gases |
What happened to the water vapour as the earth cooled? | Water vapour condensed forming oceans |
What affect did the formation of the oceans have on the amount of carbon dioxide in the atmosphere? | Carbon dioxide dissolves in water so some dissolved and the amount in the atmosphere decreased |
How did the growth of primitive plant affect the atmosphere? | They used carbon dioxide and released oxygen in photosynthesis |
What is the composition of our atmosphere today? | Nitrogen about 78%, Oxygen 21%, 1% other gases |
Name 3 greenhouse gases | Carbon dioxide, methane and water vapour |
What is the greenhouse effect | Greenhouse gases absorb heat radiated from the earth and release it keeping the earth warm |
Name 2 effects of global warming | Polar ice caps melting, sea levels rising |
Where did the gases that fomed our early atmosphere come from? | They were produced by volcanic activity. |
What gas, in today's atmosphere was missing from our early atmosphere? | oxygen |
What does correlation mean? | There is a link between them. (eg. As one increases so does the other) |
When did oxygen begin to be formed in our atmosphere? | When the first plants began photosynthesising |
What do greenhouse gases do? | Trap heat in our atmosphere |
Name one man made cause of the greenhouse effect | Deforestation |
What has happened to the amount of carbon dioxide in our atmosphere in the last 200 years? | It has increased |
What human activity might have increased the amount of carbon dioxide in our atmosphere? | Burning fossil fuels |
What human activity, other than burning fossil fuels, might have increased the amount of carbon dioxide in our atmosphere? | Respiration (as population increases so does this) |
If a sample of the atmosphere is reaccted with copper, what gas will react? | Oxygen |
If all the oxygen is removed from a sample of the atmosphere how much is removed? | 21% |