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GCSE1 Atmosphere

AQA GCSE chapter 13 Atmosphere (and chapter 9 combustion)

QuestionAnswer
What produced gases in the early atmosphere? Volcanoes
Name 4 gases in early atmosphere Methane, Carbon Dioxide, Ammonia, Water vapour; there definitively was NO OXYGEN!!!
How do scientist know the composition of the early atmosphere? they analysed the bubbles of gas trapped in ancient air
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
What is the formula of Carbon Dioxide CO2 (ensure that the symbols for Carbon, for Oxygen are in CAPITAL letters) (the numbers should be in subscript!!!)
What is the formula of Methane CH4 (ensure that the symbols for Carbon, and Hydrogen are in CAPITAL letters) (the numbers should be in subscript!!!)
What is the formula of Ammonia NH3 (ensure that the symbols for Nitrogen and Hydrogen are CAPITAL letters) (the numbers should be in subscript!!!)
What is the formula of Oxygen gas O2
What is the formula of Nitrogen N2 (ensure that the symbols for Nitrogen is in CAPITAL letters) (the numbers should be in subscript!!!)
What is the formula for Water? H2O (ensure that the symbols for Carbon and for Oxygen are CAPITAL letters) (the number should be in subscript!!!)
What is the formula for Carbon Dioxide? CO2 (ensure that the symbols for Carbon and for Oxygen are CAPITAL letters) (the number should be in subscript!!!)
What is the formula for Glucose? C6H12O6 (ensure that the symbols for Carbon, Hydrogen and for Oxygen are CAPITAL letters) (the numbers should be in subscript!!!)
How many oxygen atoms in a molecule of Glucose C6H12O6? 6, simply look at the number after the symbol for oxygen
What is the total number of atoms in a molecule of Glucose C6H12O6? 6+12+6=24, simply look at the number after the symbol for oxygen
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 gasin today’s atmosphere? How much is there? Argon, 1%
CHALLENGE: 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.
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 most the CO2 now? Trapped in Carbonate rocks
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. 1) dissolves in oceans 2)used to form skeletons / shells of marine organisms/sea snails 3)plants started photosynthesis
Explain why levels of Oxygen went up when plants appeared? Plants started photosynthesis; photosynthesis releases oxygen
Write the word equation for photosynthesis reaction Carbon Dioxide + Water  Glucose + Oxygen
Write the balanced equation for Photosynthesis 6 CO2 + 6 H2O  C6H12O6 + 6O2
Describe how crude oil is formed 1) planktons die 2) covered in mud 3) rots WITHOUT OXYGEN (anerobic) 4) get compressed and heated 5) over millions of years
Describe how coal is formed 1) plants die 2) covered in mud 3) rots WITHOUT OXYGEN (anerobic) 4) get compressed and heated 5) over millions of years
Write the word equation to show the reaction of Methane with Oxygen that took place millions of years ago Methane + Oxygen  Carbon Dioxide + Water (did you say Methane Oxide ooops; better learn this one!!!)
Write the word equation to show the reaction of Ammonia with Oxygen that took place millions of years ago Ammonia + Oxygen  nitrogen + Water (did you say Ammonia Oxide ooops; better learn this one!!!)
Write the balanced equation for the reaction of Methane with Oxygen that took place millions of years ago CH4 + 2 O2  CO2 + 2 H2O (always start by writing the word equation! Then formulae! Then balance)
Write the balanced equation for the reaction of Ammonia with Oxygen that took place millions of years ago 4 NH3 + 3 O2  2N2 + 6 H2O (always start by writing the word equation! Then formulae! Then balance)
Name one natural source of CO2 today 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
Created by: ursulinechem2