Chemistry of the Atmosphere
- Created by: ElizabethStudies
- Created on: 26-01-19 14:06
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- Chemistry of the Atmosphere
- Evolution of the Atmosphere
- Phase 1-Volcanoes gave out gases.
- Early atmosphere was mostly Carbon Dioxide and no oxygen.
- The surface was covered in Volcanoes that erupted and released lots of gases.
- Volcanic activity released Nitrogen, Water vapour and small amounts of methane and ammonia.
- Phase 2- Removing Carbon Dioxide
- The Water Vapour condensed, forming the oceans. Carbon Dioxide was removed as it dissolved in the oceans.
- Plants and algae evolved and absorbed Carbon Dioxide to carry out photosynthesis.
- Phase 3- Producing Oxygen
- Plants and algae produce oxygen by photosynthesis.
- As oxygen levels built up, more complex life could evolve.
- The composition of the atmosphere today- 80% nitrogen, 20% Oxygen and small amounts of carbon dioxide, water vapour and noble gases.
- Phase 1-Volcanoes gave out gases.
- Greenhouse Gases
- Carbon Dioxide, Methane and Water Vapour are the main greenhouse gases.
- They act like an insulating layer around the Earth allowing it to stay warm.
- Absorb the long wavelength radiation and reflect it back to earth.
- Thermal Radiation- results in the warming of the Earths surface.
- Air Pollution
- Fossil Fuels contain hydrocarbons and during combustion they are oxidised. Releasing carbon dioxide and water vapour into the atmosphere.
- When there's enough oxygen, all the fuel burns(complete combustion).
- When theres not enough oxygen not all the fuel burns(incomplete combustion). Under these conditions, particulates and carbon monoxide are released.
- Acid Rain- When dilute sulphuric acid or dilute nitric acid mix with clouds.
- Sulphur dioxide- released during the combustion of fossil fuels that contain sulphur impurities.
- Nitrogen oxides- created from a reaction between nitrogen and oxygen caused by heat of burning.
- Evolution of the Atmosphere
- Phase 1-Volcanoes gave out gases.
- Early atmosphere was mostly Carbon Dioxide and no oxygen.
- The surface was covered in Volcanoes that erupted and released lots of gases.
- Volcanic activity released Nitrogen, Water vapour and small amounts of methane and ammonia.
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