Chemistry C1
- Created by: Seun.A
- Created on: 30-04-15 18:40
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- Chemistry C1 (Air Quality)
- The Early Atmosphere
- Volcanoes Phase 1
- Gave out lots of gases including CO2, Nitrogen and Water Vapour.
- First 2 billion years.
- Earth's surface was originally molten.
- Oceans formed when the water vapour condensed.
- CO2 dissolved into the oceans.
- Green Plants Phase 2
- The next 2 billion years.
- Green plants removed CO2 from the air by photosynthesis.
- A product of photosynthesis is Oxygen, which added to the Earth's atmosphere.
- When plants died the carbon became 'locked up' in sedimentary rocks and fossils fuels, as insoluble carbonates.
- Complex Organisms Evolved
- The oxygen in the air killed of some organisms that couldn't tolerate it.
- Other organisms evolved as some died.
- No more CO2 in the atmosphere.
- Volcanoes Phase 1
- The Earth
- The atmosphere of the Earth: 78% Nitrogen 21% Oxygen 1% Argon Also a small amount of other gases e,g CO2 (0.04%) and Water Vapour
- Pollutants
- Human activities (e.g driving, power stations, etc) produces a number of gases that are released to the atmosphere.
- Carbon dioxide
- Molecule CO2
- Removed from the atmosphere by photosynthesis and dissolving into lakes.
- It is put into the atmosphere by burning fossil fuels, vehicle engines and many other human activities.
- Adds to the greenhouse effect, which is warming up the Earth.
- Causes problms like, rise in sea level, ice caps melting, floods, etc.
- Particles
- Tiny particles that are in the air
- Carbon particles are produced when fuels burn incompletely.
- They float around in the atmosphere (for some time).
- After floating, they fall back to the ground and deposit themselves as soot, (often found on buildings).
- Carbon Monoxide
- Molecule CO
- It is produced whne not enough oxygen burns with Carbon (incomplete burning)
- It is a poisonous gas that can make people drowsy or even kill them if they inhale it.
- Nitrogen Oxides
- Nitrogen Monoxide
- Molecule NO
- When nitrogen is exposed to oxygen at high temperature, NO is made. This can happen when fuels burn in car engines.
- Nitrogen Dioxide
- Nitrogen Monoxide reacts with more oxygen in the air to make NO2.
- Molecule NO2
- Nitrogen Dioxide also reacts with moisture in clouds and makes dilute nitric acid (acid rain).
- Nitrogen Monoxide
- Carbon dioxide
- Human activities (e.g driving, power stations, etc) produces a number of gases that are released to the atmosphere.
- Fossil Fuels
- Some Fossil Fuels are made from hydrocarbons.
- Hydrocarbons only contain the elements hydrogen and carbon.
- When hydrocarbons burn the products are CO2 and H2O
- Most Fossil Fuels are from the remains of dead plants and animals from million years ago.
- Hydrocarbons only contain the elements hydrogen and carbon.
- Coal is an example of a Fossil Fuel
- It is made up of mainly carbon.
- When burned, it produces CO2 (combustion).
- Some Fossil Fuels are made from hydrocarbons.
- The Early Atmosphere
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