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Do now!

Do now!. Can you stick the target sheet for the new topic in your book please? Then fill in the first column. Reminder!. Sound and Light tests on Thursday Speeding Up and Energy tests Monday. www.MrSimonPorter.wikispaces.com. Acids and alkalis. What have you remembered?.

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Do now!

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  1. Do now! Can you stick the target sheet for the new topic in your book please? Then fill in the first column.

  2. Reminder! • Sound and Light tests on Thursday • Speeding Up and Energy tests Monday

  3. www.MrSimonPorter.wikispaces.com

  4. Acids and alkalis What have you remembered?

  5. Acid tastes

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

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

  8. Litmus Turns red in acid Turns blue in alkali

  9. 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

  10. Other indicators Red cabbage and beetroot make excellent indicators

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

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

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

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

  15. Neutralisation

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

  17. Neutralisation Acid + alkali salt + water Both neutral

  18. Examples of neutralisation

  19. Metals and acids Hydrochloric acid + magnesium magnesium chloride + hydrogen Nitric acid + iron iron nitrate + hydrogen Sulphuric acid + zinc zinc sulphate + hydrogen In general, hydrochloric acid makes a chloride, nitric acid makes a nitrate, and sulphuric acid makes a sulphate. “salts”

  20. Acid + carbonate Acid + carbonate “salt” + carbon dioxide + water Hydrochloric acid + sodium carbonate sodium chloride + carbon dioxide + water Sulphuric acid + calcium carbonate calcium sulphate + carbon dioxide + water Nitric acid + copper carbonate copper nitrate + carbon dioxide + water a “salt”

  21. Today’s lesson • Testing the pH of soils around the school

  22. Stick it in! (9Ga/3)

  23. Testing soil for pH • Make notes of location, plants and description of the soil • Put a couple of spatulas of soil carefully in a test tube • Half fill the test tube with DISTILLED WATER, put a bung in and gently shake • Allow the soil to settle • Test pH using Universal Indicator paper

  24. You have 35 minutes

  25. Oh no!

  26. Let’s read pages 86 and 87

  27. Questions on pages 86 and 87

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