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C1 Sea & Atmosphere

Edexcel C1 Topic 1Sea and Atmosphere

QuestionAnswer
Name 4 gases in early atmosphere Methane, Carbon Dioxide, Ammonia, Water vapour
What is the source of gases in early atmosphere? Volcanoes
What was the main gas is early atmosphere? Carbon Dioxide
What gas was "missing" in early atmosphere? Oxygen
How were the oceans formed? Condensation of water vapour
Why did the levels of Carbon Dioxide go down? CO2 dissolved in oceans; animals used it for making their shells
Where is the CO2 now? Trapped in Carbonate rocks
Why did the levels of Oxygen rise? Plants appeared and started Photosynthesis
Name one natural source of CO2 Volcanoes
Name one human activity that produces CO2 Combustion of fossil fuels
Name one human activity that produces Methane Farming
Name one human activity that is reducing the amount of CO2 reabsorbed by plants Deforestation
What is the formula of Carbon Dioxide CO2
What is the formula of Methane CH4
What is the formula of Ammonia NH3
What is the formula of Oxygen gas O2
What is the formula of Nitrogen N2
How much Nitrogen is there in the atmosphere today? 78%
How much Oxygen is there in the atmosphere today? 21%
What is the third most abundant gas? How much is there? Argon, 1%
Name a source of evidence that Oxygen started to appear about 2 billion years ago No more Iron Sulfide was formed; but Iron Oxide formed instead.
What produced gases in the early atmosphere? Volcanoes
How does Carbon Dioxide become Calcium Carbonate? • dissolves in oceans • used to form skeletons / shells of marine organisms/sea snails •these formed sediments when the organisms died
State 3 reasons why levels of Carbon Dioxide went down millions of years ago. • dissolves in oceans • used to form skeletons / shells of marine organisms/sea snails plants started photosynthesis
Explain why levels of OXygen went up when plants appeared? Plants started photosynthesis; photosynthesis releases oxygen
Explain how the water level goes up when a candle goes out in a jar • because (candle) burning uses oxygen • water takes place of oxygen • one fifth of way up jar / only part way as air is 20% oxygen
Describe how the copper experiment can be used to work out the % of oxygen in the air •push/pull syringes to move air •volume of air in syringes decreases •oxygen removed from air;copper joins with oxygen;copper oxide formed;continue until no further change;allow to cool;final reading =79cm3;because 21 cm3 of oxygen has reacted
Created by: UrsulineChem