"How to Make Water Clear" Drinking Water PPT Courseware 2

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"How to Make Water Clear" Drinking Water PPT Courseware 2

How to deal with a glass of turbid natural water?

Method 1: Let the water in the beaker stand for a period of time to allow some insoluble solid impurities in the water to settle, and then use some method to separate the solids from the water.

Method 2: Add certain water purifying agents such as alum to the water, use the colloid formed after alum dissolves in water to adsorb impurities, and make the impurities settle to achieve the purpose of water purification, and then use some method to make the sediment and water separation.

Method 3: Boil water into steam by heating, and then condense the water vapor into distilled water to remove impurities in the water.

1. Methods of separation of mixtures

1. Precipitation

2. Filter

Definition: The operation of separating water-insoluble solid impurities from water.

3. Adsorption

4. Distillation (evaporation)

2. Hard water and soft water

1. Definition: Water containing more soluble calcium and magnesium compounds is called hard water; water with no or less soluble calcium and magnesium compounds is called soft water.

2. The harm caused by hard water to life and production:

(1) Washing clothes with hard water wastes soap and cannot clean the clothes. Over time, the clothes will become hard.

(2) When burning a boiler, using hard water can easily cause scale to form in the boiler, which not only wastes fuel, but may also cause an explosion in severe cases.

3. How to distinguish between hard water and soft water:

(1) Water with scale produced after being heated or left for a long time is hard water.

(2) Add soapy water to the water. Water with few bubbles is called hard water, and water with a lot of bubbles is called soft water.

4. Methods for softening hard water:

(1) In daily life, by boiling water or exposing it to the sun.

(2) The method of preparing distilled water in the laboratory.

1. Which of the following methods can be used to distinguish hard water from soft water ( )

A． observe color

B. Add alum and stir

C. dissolved table salt

D. Add soapy water and stir

2. The following measures that are not water purification are ( )

A． Adsorption

B. filter

C. electrolysis

D. distillation

3． Which of the following statements is wrong ( )

A． Filtration removes insoluble matter from water

B. Distilled water is water with a higher degree of purification

C. Boiler water hardness is too high and is very dangerous

D. Activated carbon can convert hard water into soft water

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"How to Make Water Clear" Drinking Water PPT Courseware:

"How to Make Water Clear" Drinking Water PPT Courseware Precipitation Method Experiment: Take a cup of muddy water, let it sit for 5 minutes, and observe whether anything sinks to the bottom of the cup. _________If you add a little alum or activated carbon to the mud water, let it sit for 5 minutes and observe the solid particles sinking to the bottom of the cup.

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Update Time: 2024-11-22

This template belongs to science courseware E-education edition third grade science volume 1 industry PPT template

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