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OCR AS Chemistry Notes


THE GREENHOUSE EFFECT
Without greenhouse gases, planet would be a lot colder
o Hence average temperatures of Venus and Mars

THE GREENHOUSE EFFECT
1. Incoming visible light is unaffected by the gases in the earth's atmosphere
2. Some is reflected by the earth and the atmosphere…

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This causes the molecule to vibrate
Eventually the molecule will emit some of this energy as radiation
This radiation can then be absorbed by another greenhouse gas or the earth's surface




GWP =
o Global Warming Potential
o Ability of a trace gas to cause global warming
o Chlorofluorocarbons (CFCs)…

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o The hydrogen is burnt, producing only water




STORAGE AS CARBONATES
Store carbon in stable minerals by reacting CO2 with metal oxides to produce stable carbonates
o C aO (s) + C O2 (g)CaCO3 (s)
o M gO (s) + C O2 (g)MgCO3 (s)
However natural reaction is very slow…

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Produces natural fizz in beer
Supercritical CO2 can be used to extract the flavour of beer from hops

DRY CLEANING

Previous solvents are toxic
Used with a wetting agent, CO2 is a safer solvent that still dissolves grease

TOXIC WASTE TREATMENT

Remove toxic chemicals from waste

CHEMICAL SYNTHESIS

Can be…

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1) USING RENEWABLE RESOURCES
a. Plant-based substances
b. Solar energy instead of fossil fuels (eventually run out)
2) SAVING MONEY
a. Not having to treat hazardous waste
b. Using fewer chemicals
c. Using less energy
3) PREVENTING WASTE
a. Time + money is not spent on clearing it up
4)…

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