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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

07/05/2010 (Day 5)

WELCOME

http://plkclscmc-timothy.viviti.com/


Chapter 5

Chapter 5

The wonderful solvent - WATER

Solvent – 溶劑

 A liquid that many substances can dissolve in it.


Revision impurities p 55

Revision: Impurities (P.55)

3 types of impurities:

- soluble

- insoluble

- micro-organisms


How to remove impurities from water p 58

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


Sedimentation 沉積法

  • Remove large insoluble solid impurities from water.

Filtration 過濾法

  • Remove fine insoluble solid impurities.


Sedimentation 沉積法

  • Removing large solid impurities by sedimentation

Alum(明礬)

Alum makes the solid impurities to settle more quickly.


Sedimentation 沉積法

  • Removing large solid impurities by sedimentation

  • sediment


Filtration 過濾法

  • II. Using the filter paper

  • residue

  • filtrate


Filtration 過濾法

  • Remove fine insoluble solid impurities.

3.

The solid impurities are trapped in the filter column.


Filtration 過濾法

  • I. Using the filter column

4.

What is the colour of the filtrate?

_______________


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.


Distillation 蒸餾法 (P.64)

  • Remove all soluble, insoluble impurities and micro-organisms.

Distillation

1. Boiling, 2. Condensation


Experiment 5.3(P.65)

  • Remove impurities in water by distillation.


Experiment 5.3(P.65)

  • Remove impurities in water by distillation.


Experiment 5.3(P.65)

  • Remove impurities in water by distillation.


Experiment 5.3(P.65)

  • Remove impurities in water by distillation.


Experiment 5.3(P.65)

  • Remove impurities in water by distillation.

3.

It changes from liquid to steam.

4.

Steam changes to water.


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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