New Topic

1. New Topic C1 5 Products from Oil

2. Cracking Hydrocarbons • What is crude oil? • Where does it come from? • What does it contain?

3. Alkanes revision • Draw and name the first 4 alkanes into your books. • Remember: Monkeys Eat Peanut Butter

5. How is crude oil separated?

6. Problem • The long chained hydrocarbons are not useful • They are thick liquids or solids with high boiling points • They do not catch fire very easily • This means they are not good for fuels

7. Cracking • We can break down long hydrocarbon chains into smaller more useful chains • Would you rather have lots of individual bars of chocolate or only one big bar?

8. Cracking video • http://www.youtube.com/watch?v=Ehcq4cARkMI

9. Cracking Theory • Long hydrocarbon chains are vaporised and passed over a hot catalyst or mixed with steam • It is heated to a high temperature • The long chains are ‘cracked’ as thermal decomposition takes place • The large chains split apart to form smaller more useful chains

10. Definitions • Hydrocarbon • Contains hydrogen and carbon only • Vaporised • Turned into a gas • Catalyst • Speeds up a reaction • Thermal decomposition • Break down of substance due to heat

11. Task • Produce a comic strip for cracking alkanes using ALL the key words Vaporised: turned from a liquid to a gas Useless long chain hydrocarbon Passed over a catalyst Smaller more useful chains produced Thermal decomposition takes place (long chain breaks down)

12. Extension • Draw and label the practical equipment used for cracking on page 75 • How does the practical take place?

13. Plenary • Summarise today’s learning in one sentence.