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 ScaleA waytomeasurehowacidicoralkaline a substanceisUniversal indicatorpaper shows a differentcolourforeach pH
Indicators • What is an indicator? • Which indicator has many different colours? • Name some other indicators.
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.
The power of acids • http://youtu.be/kcDSngXldB0 • http://youtu.be/F5jfRjzXLbE
More acids and alkalis • Card sort
Indicators • Whatisanindicator? • Name 3 indicators.
Thingsto do:1. Write a methodfortheexperiment2. Do a diagram of theexperiment3. Makeyourindicator and writeaboutitisthetable
Acid rain • What is acid rain? • Which gases cause acid rain?
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?
Neutralisation • What is neutralisation? • Complete this formula Acid + Alkali → • Name 3 examples of when neutralisation is useful.
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
Treating Insect Stings Treating Insect Stings Treating Insect Stings
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?