(a)[3]
Outline how petroleum (crude oil) is separated into fractions such as petrol, diesel and bitumen.
(b)[1]
State one large-scale use of bitumen.
(c(i))[1]
Long chain hydrocarbons can be cracked to produce hydrogen. A long chain hydrocarbon has the molecular formula C$_{12}$H$_{26}$. Explain how this formula shows that this hydrocarbon is an alkane.
(c(ii))[1]
Construct an equation that shows the cracking of C$_{12}$H$_{26}$ to form hydrogen and at least one alkene.
(d)[2]
Hydrogen and petrol are each used as fuels. State and explain one advantage of choosing hydrogen instead of petrol as a fuel.