Topic 8 0.0 / 5 ? ChemistryThe earth and its atmosphereGCSEEdexcel Created by: LaurenkjCreated on: 12-11-18 17:34 What did volcanic activity on the early earth throw into the the atmosphere Carbon dioxide, water vapour and small amounts of sulphuric acids 1 of 12 What did the early atmosphere not have Early atmosphere Had little to no oxygen 2 of 12 What happened to the earth next It started to cool 3 of 12 What was the result in the earth cooling Less volcanic activity - less gas in atmosphere. Water vapour the leaves the atmosphere 4 of 12 Where did the seas and oceans come from When the water vapour condenses it rains alot 5 of 12 What reduced the amount of CO2 in the atmosphere CO2 dissolved in seas and oceans and became trapped, forming carbonates 6 of 12 What was the first evidence of oxygen In 2.5 billion year old rocks 7 of 12 Where did oxygen come from after Once oceans were cool enough microscopic organisms could survive and photosynthesised. Then land plants developed and photosynthesised 8 of 12 How much nitrogen is there in today’s atmosphere 78% 9 of 12 How much oxygen is there in today’s atmosphere 21% 10 of 12 How much of other gases are there in today’s atmosphere 1% - noble gases, carbon dioxide and water vapour 11 of 12 What is one practical that can show how much oxygen there is in the atmosphere Floating candle (image in book). Candle uses O2 to burn, water fills gap left by O2 and will rise 20% 12 of 12
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