1. 1. Features of chemical reactions

2. Objectives Describe the characteristics of a chemical reaction ( chemische Reaktion ) chemischeReaktion Create word equations (Wortgleichung) for simple reactions Explain what happens in displacement reactions (Ersetzungreaktion)

3. What is a chemical reaction? Any ideas? New thing made Can’t get back Watch the demonstration Any ideas now?

4. Definition A chemical reaction is a process that changes one set of substances into another You can tell it is a chemical reaction because there is a change and it is difficult to get back to the raw materials

5. Examples of chemical reactions Fireworks Baking a cake Explosions Thermite Barbecue Copper corroding Digesting Burning

6. Task Complete the worksheet

7. Reminder: respiration What is the purpose? What is the word equation?

8. Respiration Used by living things to get energy from food The chemical equation is: Sugar + oxygen  water + carbon dioxide Reactants (Reaktanten)  Products (Produkte)

9. Chemical equations (chemischen Gleichungen) For respiration, the chemical equation is: Sugar + oxygen  water + carbon dioxide Reactants (Reaktanten)  Products (Produkte) The arrow shows that there is a change

10. The Thermite Reaction This uses iron oxide and aluminium powder Iron oxide + aluminium  Iron + aluminium oxide Q1 – What elements are involved in the Thermite reaction? Q2 – What has the aluminium done? Q3 – Why has it done this? Q4 – Why did the iron melt?

11. Magnesium and copper sulphate Q1 - What happens when magnesium is added to copper sulphate (das Kupfersulfat) solution?dasKupfersulfat Q2 - Why does this happen? Q3 - What is the chemical equation for this? Magnesium + copper sulphate  magnesium sulphate + copper

12. Thinking time What is the link between chemical reactions and lunchtime? Complete the worksheet on reactivity

13. Objectives Describe the characteristics of a chemical reaction ( chemische Reaktion ) chemischeReaktion Be able to create word equations (Wortgleichung) for simple reactions Describe what happens in displacement reactions (Ersetzungreaktion)