1
Q
hydrocarbon
A
any compound that is formed from carbon and hydrogen atoms only
2
Q
alkane formula
A
CnH2n+2
3
Q
short carbon chain =
A
less viscous (gloopy)
more volatile
more flammable
4
Q
complete combustion equation
A
hydrogen + oxygen -> carbon dioxide + water (+energy)
during this, carbon and hydrogen are oxidised
5
Q
how is crude oil retrieved
A
high temperature and pressure turn remains of plankton into crude oil which is drilled up from rocks where it is found
6
Q
cracking
A
thermal decomposition method - breaking moelcules down by heating them
7
Q
how to crack
A
- heat long chain hydrocarbons to vapourise them
- vapour is passed over a hot powered aluminium oxide catalyst
- long chain hydrocarbons split apart on surface of catalysts (catalytic cracking)
8
Q
steam cracking
A
vapourise hydrocarbons, mix with steam and heat to very high temperature
