Earth's Atmosphere- Unit 8
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How has the Earth’s atmosphere changed from when it was first formed?
Less CO2 More Oxygen More Nitrogen
3 processes that release carbon dioxide
Burning fossil fuels decaying matter respiration of farm life Deforestation
3 processes that take in carbon dioxide
Dissolve in ocean Locked up in sedimentry rock locked up in fossil fuels locked up in plants
How did the Earth’s atmosphere form?
Gases released Through volcanic activity
How did the Oceans from?
Condensation of water vapour in the atmosphere when earth cooled
Problem of CO2
green house gas causes global warming
Problem of SO2
Dissolves in clouds Causes acid rain
Problem of CO
Silent killer toxic
Problem of particulate (soot)
Global dimming
What is carbon neutral
CO2 absorbed by plants same amount is released when burnt no net change in CO2 in the atmosphere
Why did the CO2 decrease?
Lock up In plants (photosynthesis) In the ocean (carbonates)
How do carbonates form?
CO2 dissolved in ocean forming metal carbonate
Word equation for combustion
hydrocarbon + oxygen –> water + carbon dioxide
Test for CO2
Limewater Turns clear to cloudy due to white precipitate formed
Test for water
anhydrous copper sulphate turns white to blue
How do green house gases cause global warming
They absorb infra-red light thermal energy cannot escape