chemisty 9 : crude oil and feuls

what is a hydrocarbon ?

compound containing only carbon and hydrogen

how is crude oil formed ?

over millions of years from the remains of ancient biomass

what are the alkanes ?

hydrocarbons that only have single bonds

what are the first four alkanes

methane, ethane, propane and butane

what is the general formula for the alkanes ?

Cn2n+2

how does the boiling point depend on the chain length ?

longer chain = higher boiling point

how does viscosity depend on chain length ?

longer chain = higher velocity

how does flammability depend on chain length ?

longer chain = lower flammability

ow can the diff alkanes in crude oil be separated ?

fraction distillation

what is a fraction ?

a group of hydrocarbons with similar chain lengths

name five useful fuels produced from fractional distillation

petrol , diesel oil, kerosene, heavy fuel oil, liquified petrolium gas