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Scientific Method Hypothesis and Predictions

Scientific Method Hypothesis and Predictions. Lesson 4 Indicators. Bell Work. Choose 3 acids we use at home . Explain why there may be disadvantages to using acids at home. Objectives. All - Explain what an indicator is and what they are made of Most – Be able to use a PH chart

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Scientific Method Hypothesis and Predictions

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  1. Scientific MethodHypothesis and Predictions Lesson 4 Indicators

  2. Bell Work • Choose 3 acids we use at home . • Explain why there may be disadvantages to using acids at home.

  3. Objectives • All - Explain what an indicator is and what they are made of • Most – Be able to use a PH chart • Some – Explain the differences between acids and alkalis

  4. What is the pH scale? The strength of an acid or alkali is measured by the pH scale. Universal indicator is a liquid that can tell you the pH of a solution. strongeracid stronger alkali 1 2 3 4 5 6 7 8 9 10 1112 1314 strongacid weak alkali weakacid strongalkali neutral What is the pH of a weak acid? What is the pH of strong alkali?

  5. What are Acids & Alkalis? • https://www.youtube.com/watch?v=tC-EXM9Hx6U

  6. Making your own indicator • Fill in as many blanks as you can on the method sheet for the experiment you will complete later. • Stick the sheet in • Q: What is a Universal Indicator?

  7. Experiment – Stage 1 • Crush the cabbage and water until the water is a dark purple colour Pestle Mortar Hot water Cabbage

  8. Experiment – Stage 2 • Filter the mush to separate the liquid out • https://www.youtube.com/watch?v=oG-pNRVHsc4 Funnel and Filter Paper Cabbage mush Conical Flask Cabbage juice

  9. Experiment – Stage 3 • Use your new indicator to test an acid, an alkali and a neutral substance and record what colour it goes in each • Acid – • Alkali – • Neutral – Pink Green Blue

  10. Predictions What colour do you predict if you tested: • lemon juice • Soap • Vinegar • Cola • Toilet cleaner • Water

  11. Discovery of Alkalis • Read the paragraph on page 69 entitled “what is an alkali” • Explain in your own words how alkalis were discovered

  12. Plenary • Fill in the table using the information on sheet 1 to find out how much you learnt this lesson. • Stick in sheet 2

  13. Extra Slides

  14. What is the pH?

  15. Are these substances acidic or alkaline? Are they weak or strong? What type of substance? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 acid alkali very weak acid very strong acid very weak alkali weak alkali strong acid very strong alkali weak acid

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