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04/05/2010 (Day 3)

04/05/2010 (Day 3). WELCOME. http://plkclscmc-timothy.viviti.com/. Chapter 5. The wonderful solvent - WATER. Solvent – 溶劑.  A liquid that many substances can dissolve in it. 5.1 Water purification (P.53). 5.1 Water purification (P.53). Impurities in natural water(P.55).

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04/05/2010 (Day 3)

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  1. 04/05/2010 (Day 3) 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. 5.1 Water purification (P.53)

  4. 5.1 Water purification (P.53)

  5. Impurities in natural water(P.55)

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

  7. Impurities (P.55) - soluble impurities??? - insoluble impurities??? - micro-organism???

  8. Check-point 1 (P.57) 1. (a) Water is very important to all living things. Without water, living things will _________. die 1. (b) The demand for clean water is very high because water has many different __________. uses

  9. How to remove impurities from water (P.58) The process of cleaning water is called purification.

  10. 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

  11. Sedimentation 沉積法 (P.59) • Remove large and insoluble impurities from water.

  12. Experiment 5.1(P.60) • Removing large solid impurities by sedimentation 1. Solid particles in water slowly sink to the bottom of the beaker.

  13. Experiment 5.1(P.60) • Removing large solid impurities by sedimentation top 2. The ________ portion of water is clearer.

  14. Experiment 5.1(P.61) • Removing large solid impurities by sedimentation Alum(明礬) – AluminiumSulphate

  15. Experiment 5.1(P.61) • Removing large solid impurities by sedimentation 3.(a) Water in the top portion becomes clearer. 3.(b) Alum makes the solid impurities to settle more quickly.

  16. Experiment 5.1(P.61) • DISCUSSION Q: Is the water purified by this method safe to drink? Why? A: No. It is because the water may contain soluble impurities and micro-organisms.

  17. Filtration 過濾法 (P.61) • Remove fine solid impurities.

  18. Experiment 5.2(P.62) • II. Using the filter paper

  19. HOMEWORK Revision Exercise P.50 Part A and B WORKBOOK Due date: 5-5-2010

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