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7E ACIDS AND ALKALIS

7E ACIDS AND ALKALIS. The pH scale. What is the pH scale? What pH does an acid have? What pH does an alkali have? What is the neutral pH. The pH Scale A way to measure how acidic or alkaline a substance is Universal indicator paper shows a different colour for each pH.

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7E ACIDS AND ALKALIS

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  1. 7E ACIDS AND ALKALIS

  2. The pH scale • What is the pH scale? • What pH does an acid have? • What pH does an alkali have? • What is the neutral pH

  3. The pH ScaleA waytomeasurehowacidicoralkaline a substanceisUniversal indicatorpaper shows a differentcolourforeach pH

  4. Indicators • What is an indicator? • Which indicator has many different colours? • Name some other indicators.

  5. Acids and alkalis in the Science lab • Which hazard symbols might acids or alkalis have? • What should you do if you get acid or alkali on your skin? Why? • Name two acids and two alkalis you might use in the science lab.

  6. The power of acids • http://youtu.be/kcDSngXldB0 • http://youtu.be/F5jfRjzXLbE

  7. Looking at acids and alkalis in the lab

  8. Acids and alkalis in the lab

  9. More acids and alkalis • Card sort

  10. Indicators • Whatisanindicator? • Name 3 indicators.

  11. Thingsto do:1. Write a methodfortheexperiment2. Do a diagram of theexperiment3. Makeyourindicator and writeaboutitisthetable

  12. Acid rain • What is acid rain? • Which gases cause acid rain?

  13. Next • Draw a diagram to show how acid rain is formed Answer the questions • Do you think that the acid rain problem in the UK is over or not? Explain your answer with evidence from your work. • How can countries try to solve the acid rain problem?

  14. Neutralisation • What is neutralisation? • Complete this formula Acid + Alkali → • Name 3 examples of when neutralisation is useful.

  15. NeutralisationPut 8cm3 of alkali in a test tubeAdd 1 cm3 of acid, stir and remove a drop of liquidTest the pHWash the dropperAdd 1 cm3more of acid

  16. Treating Insect Stings Treating Insect Stings Treating Insect Stings

  17. Your task is to design a page in a family health book all about insect stings and how to treat them. Step 1 Find out the pH of wasp and bee stings. Step 2 To get rid of an insect sting you need to neutralise it. What pH will neutralise the: a) Wasp sting? b) Bee sting? Step 3 Find out the pH of these household chemicals. Step 4 Which chemical would you use to treat the: a) Wasp sting? b) Bee sting? Step 5 Design your book page on plain A4 paper. Try to find out this extra info: What are the chemicals in wasp and bee stings?

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