What is crude oil?
What is a mixture
What is the general formula and structure of alkanes?
Describe the process of fractional distillation
What are the properties of long hydrocarbons? and short hydrocarbons?
What do most fuels (including coal) contain?
What happens during combustion?
What gases are released by combustion? What do these gases cause?
When are oxides of nitrogen and particulates formed?
When is sulphur removed?
What are biofuels made from?
Give two examples of biofuels