Today’s lesson

• Discuss the idea of a simple reversible reaction• Explain the concept of dynamic equilibrium

Chemical reactions – What to look for

This is from year 7!

Chemical reactions – What to look for

• There may be a change of colour

Chemical reactions – What to look for

• There may be a gas given off (bubbles)

Chemical reactions – What to look for

• There may be an energy change (gets hotter or colder)

Chemical reactions – What to look for

• New substances are formed, and the change is usually difficult to reverse

Word equations

Zinc + sulphur

reactants

Word equations

Zinc + sulphur zinc sulphide

reactants product(s)

Chemical reactions – What to look for

• New substances are formed, and the change is usually difficult to reverse

Reversible reactions

Reversible reactions

• A reversible reaction is a chemical reaction that can go both ways.

Hydrated copper sulphate Anhydrous copper sulphate + water

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)

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)

le Chatelier's principle

The position of equilibrium shifts to try to cancel out any changes you make

Haber Process

Do you like my glasses?

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

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

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!