Today’s lesson

1. Today’s lesson • Discuss the idea of a simple reversible reaction • Explain the concept of dynamic equilibrium

2. Chemical reactions – What to look for This is from year 7!

3. Chemical reactions – What to look for • There may be a change ofcolour

4. Chemical reactions – What to look for • There may be a gas given off (bubbles)

5. Chemical reactions – What to look for • There may be an energy change (gets hotter or colder)

6. Chemical reactions – What to look for • New substances are formed, and the change is usually difficult to reverse

7. Word equations Zinc + sulphur reactants

8. Word equations Zinc + sulphur zinc sulphide reactants product(s)

9. Chemical reactions – What to look for • New substances are formed, and the change is usually difficult to reverse

10. Reversible reactions

11. Reversible reactions • A reversible reaction is a chemical reaction that can go both ways. Hydrated copper sulphate Anhydrous copper sulphate + water

12. Reversible reactions • A reversible reaction is a chemical reaction that can go both ways. Ammonium chloride Ammonia + hydrogen chloride NH4Cl(s) NH3(g) + HCl (g)

13. Reversible reactions It often results in an dynamic equilibrium mixture in which the forward and backward reactions occur at the same rate. CH3COOH (aq) H+(aq) + CH3COO-(aq)

14. le Chatelier's principle The position of equilibrium shifts to try to cancel out any changes you make

15. Haber Process Do you like my glasses?

16. Objectives • State that ammonia is an important chemical • Describe how ammonia can be made • State how waste of raw materials can be minimised in making ammonia

17. Today’s Task • Using your book and the internet to create a poster explaining the Haber process. • You should include: • What does the Haber process do? • Why is ammonia important? What do we use it for? • Where do we get the materials to make the ammonia? • Give the balanced equation for the Haber process • What temperature and pressure do we use? What is the catalyst used? • Why do we use this temperature and pressure? • Include a flow diagram of the process

18. Quick game • Hunt down the questions round the room take them back to your team and give me an answer. • If you get it right you can go find question 2 and so on!