1. Do now! Can you spell the following words correctly in the back of your book? Nuetralisasion, indicater, litmas, alkcali, burete.

2. Acids and alkalis What have you learnt?

3. Acid tastes

4. Acid comes from the latin word acer, which means sharp. Acids are sharp tasting! (“Tangy”)

5. Indicators Indicators are chemicals (coloured dyes) which change colour in acids and alkalis.

6. Litmus Turns red in acid Turns blue in alkali

7. Litmus Turns red in acid Turns blue in alkali Litmus can tell us if something is an acid or an alkali, but it cannot tell us how strong the acid or alkali is

8. Other indicators Red cabbage and beetroot make excellent indicators

9. The pH scale The strength of an acid is measured on the pH scale pH stands for the “potential of hydrogen”

10. Universal Indicator To measure pH, we need an indicator that has a different colour for each value of pH Universal Indicator

11. It comes in the form of a paper

12. Universal Indicator It also comes in the form of a liquid

13. Neutralisation

14. What happens when we add an acid to an alkali?

15. Neutralisation Acid + alkalisalt + water Both neutral

16. Examples of neutralisation

17. Chemical Hazard Symbols Corrosive – dissolves metals, stone and skin Irritant – harms eyes and skin Flammable – burns easily Toxic – poisonous

18. Summary sheet Can you stick the summary sheet into your books?

19. Summary exercise

20. Read pages 64 and 65 Abigail Tom

21. Read pages 64 and 65 Abigail Tom Can you now write 6 multiple choice questions to go with these pages

22. Multiple choice questions What is a burette used for?

23. Multiple choice questions What is a burette used for? A. to add measured amounts of a liquid

24. Multiple choice questions What is a burette used for? A.to add measured amounts of a liquid B.to stir reactants together

25. Multiple choice questions What is a burette used for? A.to add measured amounts of a liquid B.to stir reactants together C.to grind solids into a powder

26. Multiple choice questions What is a burette used for? A.to add measured amounts of a liquid B.to stir reactants together C.to grind solids into a powder D.to make french toast

27. Read pages 64 and 65 Abigail Tom Can you now write 6 multiple choice questions to go with these pages

28. TEST We will be having an acids and alkalis TEST on Monday 17 th December