1. © Oxford University Press 2011 IC1.18.2 Images Images

2. © Oxford University Press 2011 IC1.18.2 Images What do the things in the pictures have in common?

3. © Oxford University Press 2011 IC1.18.2 Images Petrol, polythene bottles, and propanone for nail varnish remover are all made from chemicals obtained from crude oil.

4. © Oxford University Press 2011 IC1.18.2 Images These charts compare the supply and demand for crude oil fractions

5. © Oxford University Press 2011 IC1.18.2 Images A catalytic cracking tower at an oil refinery

6. © Oxford University Press 2011 IC1.18.2 Images In cracking, each octane molecule breaks down to make two smaller molecules, such as hexane (C 6 H 14 ) and ethene (C 2 H 4 )

7. © Oxford University Press 2011 IC1.18.2 Images The displayed formula of ethene shows how its atoms are joined together.

8. © Oxford University Press 2011 IC1.18.2 Images You can detect compounds with double bonds by testing with a solution of bromine, or bromine water

9. © Oxford University Press 2011 IC1.18.2 Images Orange bromine water becomes colourless when it reacts with ethene and other unsaturated compounds

10. © Oxford University Press 2011 IC1.18.2 Images The displayed formula of propene, C 3 H 6