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07/05/2010 (Day 5)

07/05/2010 (Day 5). WELCOME. http://plkclscmc-timothy.viviti.com/. Chapter 5. The wonderful solvent - WATER. Solvent – 溶劑.  A liquid that many substances can dissolve in it. Revision: Impurities (P.55). 3 types of impurities:. - soluble. - insoluble. - micro-organisms.

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07/05/2010 (Day 5)

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  1. 07/05/2010 (Day 5) WELCOME http://plkclscmc-timothy.viviti.com/

  2. Chapter 5 The wonderful solvent - WATER Solvent – 溶劑  A liquid that many substances can dissolve in it.

  3. Revision: Impurities (P.55) 3 types of impurities: - soluble - insoluble - micro-organisms

  4. How to remove impurities from water (P.58) 3 different methods remove different types of impurities. Sedimentation 沉積法 Filtration 過濾法 Distillation 蒸餾法

  5. Sedimentation 沉積法 • Remove large insoluble solid impurities from water. Filtration 過濾法 • Remove fine insoluble solid impurities.

  6. Sedimentation 沉積法 • Removing large solid impurities by sedimentation Alum(明礬) Alum makes the solid impurities to settle more quickly.

  7. Sedimentation 沉積法 • Removing large solid impurities by sedimentation • sediment

  8. Filtration 過濾法 • II. Using the filter paper • residue • filtrate

  9. Filtration 過濾法 • Remove fine insoluble solid impurities. 3. The solid impurities are trapped in the filter column.

  10. Filtration 過濾法 • I. Using the filter column 4. What is the colour of the filtrate? _______________

  11. Filtration 過濾法 • DISCUSSION Q: Is the filtrate safe to drink? Why? Ans. NO~ It is because the filtrate may contain soluble impurities and micro-organisms.

  12. Distillation 蒸餾法 (P.64) • Remove all soluble, insoluble impurities and micro-organisms. Distillation 1. Boiling, 2. Condensation

  13. Experiment 5.3(P.65) • Remove impurities in water by distillation.

  14. Experiment 5.3(P.65) • Remove impurities in water by distillation.

  15. Experiment 5.3(P.65) • Remove impurities in water by distillation.

  16. Experiment 5.3(P.65) • Remove impurities in water by distillation.

  17. Experiment 5.3(P.65) • Remove impurities in water by distillation. 3. It changes from liquid to steam. 4. Steam changes to water.

  18. Experiment 5.3(P.65) • Remove impurities in water by distillation. 5.(a) The distillate is colourless. 5.(b) It is water.

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