"Water Can Dissolve Some Substances" Dissolution PPT Courseware 3

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"Water Can Dissolve Some Substances" Dissolution PPT Courseware 3

Activity 1: Observation experiment on whether salt and sand can be dissolved in water

Experimental equipment: beaker, water, glass rod, salt, sand

Experimental steps:

1. Observe salt and sand with the naked eye and describe their characteristics.

2. Put the salt and sand into two beakers filled with water, without stirring, and observe and compare.

3. After a while, stir gently with a glass rod and observe their changes.

Experimental notes:

1. Only about half a cup of water is needed.

2. In order to make the mixing more complete, we can use a glass rod to stir and then observe and record.

3. When stirring the glass rod, try not to touch the wall and bottom of the cup, and try not to make any noise.

4. Carefully observe and record the changes in the salt and sand before, during and after they are put into the water.

Precautions for filtering operations

Achieve: "One stick, two low, three rely"

1. Place the filter paper close to the inner wall of the funnel

2. The edge of the filter paper is lower than the edge of the funnel

3. The liquid level is lower than the edge of the filter paper

4. The beaker is placed close to the glass rod

5. The glass rod leans against one side of the three layers of filter paper

6. The longer opening at the lower end of the funnel is close to the inner wall of the beaker

Consolidating homework:

1. The phenomenon that table salt turns into extremely small particles invisible to the naked eye and is evenly and permanently distributed in the water is called ( ).

2. When using filter paper for filtration, the filter paper should be folded in half ( ) times first and ( ) before being put into the funnel.

3. In the experiment, sand and flour can be separated by filtration, we say that they are not ( ).

4. In order to make the mixture more complete, we can use ( ) to stir.

Post-class survey:

What other substances in life are soluble in water, and which substances are not easily soluble in water?

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Update Time: 2024-11-18

This template belongs to science courseware Fourth Grade Science Volume 1, Textbook Edition industry PPT template

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