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GCSE1 Atmosphere
AQA GCSE chapter 13 Atmosphere
| Question | Answer |
|---|---|
| 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 |
| 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 |
| How do we know what the atmosphere was like millions of years ago? | 1) Scientists study the gases coming out of volcanoes and 2) they can identify gases in the atmosphere of planets that are at the beginning of their "life". |
Created by:
ursulinechem2
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