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Qingdao Edition Fifth Grade Science Volume 1	pptx	6 MB

"The water has become salty" PPT

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Upload Time: 2024-09-16

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"The water has become salty" PPT

Part One: Dissolution

Kind tips

Potassium permanganate is a corrosive drug, so be careful not to get it on your hands, body or clothes. When doing experiments, students should observe carefully, record the experimental phenomena, and fill in the experimental record sheet.

Dissolve

The phenomenon that potassium permanganate, like potassium permanganate, becomes extremely small particles invisible to the naked eye in water and is evenly dispersed in the water without settling on its own is called dissolution.

explain:

Why can't I see salt and sugar in these two cups?

Think about it:

Our lives are more colorful because of dissolution. Can you give us some examples of dissolution in your life?

Water becomes salty PPT, part 2 content: Experimental tips

Kind tips

1. Pay attention to safety when experimenting.

2. When stirring clockwise with a glass rod, try not to touch the wall and bottom of the beaker. Wipe the glass rod clean after each use.

3. When making, only one substance can be placed in a glass of water.

4. Take appropriate amounts of items, do not pick them up with your hands, and do not taste them casually.

5. Observe carefully and keep records.

6. The division of labor among team members should be clear.

The water has become salty PPT, the third part: extracurricular development

An appropriate amount of washing powder can be dissolved in water. What will happen if washing powder is continuously added to the water?

Little Doctor:

At a certain temperature, a certain amount of water can only dissolve a certain amount of substances. Substances that exceed the limit cannot continue to dissolve. This phenomenon is called "saturation", and the resulting solution is called "saturated solution".

think:

We didn’t see any salt, but why is the water salty?

Guess what might happen to table salt in water?

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Update Time: 2024-09-16

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"The water has become salty" PPT