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Do now!

Do now!. Can you spell the following words correctly in the back of your book? Nuetralisasion, indicater, litmas, alkcali, burete. Acids and alkalis. What have you learnt?. Acid tastes. Acid tastes.

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Do now!

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  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 tastes 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. Universal Indicator It comes in the form of a paper

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

  13. Neutralisation

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

  15. Neutralisation Acid + alkali salt + 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 Tom Abigail

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

  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? • to add measured amounts of a liquid • to stir reactants together

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

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

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

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

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