# C1 - FOSSIL FUELS

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• FOSSIL FUELS
• Most are HYDRO-CARBONS
• only difference between most fossil fuels is the LENGTH of the hydrocarbons they contain
• EXCEPT coal - mainly carbon w/ lots of impurities
• Formed from remains of dead plants/animals over millions of year
• Fuels are retrieved by digging out the earth
• combustion - a type of chemical reaction
• Oxygen added = an oxidation reaction
• Oxygen is needed to burn hydrocarbons
• they burn quicker in pure oxygen than in oxygen from the air
• so pure oxygen taken from air, and kept in pressure cylinders for later use
• WHEN HYDRO-CARBONS BURN
• 2H(2) + O(2) = 2H(2)O
• C + O(2) = CO(2)
• WHEN COAL BURNS