Atmosphere

my chemistry teacher sent this to me a feww weeks before my c1 exam. hope you find this helpful

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Atmosphere
Early Atmosphere:
Gases present:
methane [CH4]
ammonia [NH3]
water vapour or steam [H2O]
carbon dioxide [CO2]
Why?
Earth was very hot
Lots of volcanoes
What happened next?
Earth cooled
Fewer volcanoes
Gases:
No more:
methane [CH4]
ammonia [NH3]
water vapour or steam [H2O]
carbon dioxide [CO2]
What happened to the gases:
Water vapour condensed to form oceans
Most of the CO2 remaining dissolved in the oceans
All ammonia dissolved in the oceans
Today's atmosphere:
78% nitrogen
21% oxygen
Approx 1% other gases including CO2
How did we get nitrogen?
Bacteria used ammonia in water to make nitrogen
How did we get oxygen?
Green plants carry out photosynthesis: took in CO2 and gave out O2
C1 Revision-Atmosphere2012

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What happened to the CO2?
Most dissolved in oceans- used by sea creatures to make calcium carbonate for their shells
The rest used by plants in photosynthesis
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Exam practice
Foundation-
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Examples of 6 mark questions:
Our atmosphere is very different from how it was 6 billion years ago. Explain why this is so.
1. Early Earth very hot with volcanic eruptions
2. Main gases:methane, ammonia, carbon dioxide, water vapour
3. Earth cooled and there were fewer volcanoes
4. Water vapour condensed to form oceans
5. Bacteria converted ammonia to nitrogen
6. Carbon dioxide reduced by dissolving in oceans and being used by simple plants
7. Plants gave out oxygen from photosynthesis
8.…read more

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