Unit AS 2 - Further Physical and Inorganic Chemistry and Introduction to Organic Chemistry
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Alkanes
Saturated: Contain no C double bond C or triple bond
General Formula: CnH2n+2
Boiling Points:
As chain length increases, BP increases, more VdWs between molecules
Higher branching = lower BP, less VdWs because molecules can’t get close together
Combustion:
Complete = CO2/H20/ clean flame, Incomplete= CO/H2O/sooty flame
Carbon burns with a yellow ish flame, hydrogen burns with a blue flame
Pollution from fossil fuels
C02 emissions have risen from 0.03 to 0.04%
Methods:
Remove sulphur from fuels before combustion
Using catalytic converters in cars
Scrubbing emissions from power stations and factories
Using renewable energy sources
Catalytic Converters
-Honeycomb ceramic structure, coated in metal catalyst
-metal coating keeps costs down, honeycomb structure = larger SA for reactions to take
place, can become poisoned by lead
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