"The Missing Water" Water Changes PPT Courseware 3

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"The Missing Water" Water Changes PPT Courseware 3

discuss:

1. Where did the water in the teacher’s hand and the water on the blackboard go?

2. Did you see how the water escaped?

3. What kind of object does this mean that water turned into and escaped?

Water turns into a colorless, odorless, transparent gas and runs into the air. This phenomenon is called evaporation

Think: At what temperature does water turn into water vapor?

At normal temperatures, water slowly turns into water vapor and disperses into the air.

This phenomenon is called evaporation

Kind tips:

During the experimental operation, do not touch the burning alcohol lamp and beaker to avoid burns;

Do not drink boiled water, it is not safe;

The match must be thrown out, not blown;

The alcohol lamp should be lit outside and then heated under a beaker. When extinguishing it, take out the alcohol lamp first to prevent your hands from being burned.

When the alcohol lamp is knocked over and burns, you can use the wet towel prepared by the teacher to cover the alcohol lamp to extinguish it;

The thermometer cannot be taken out to read;

When extinguishing the alcohol lamp, do not blow it and cover it with a waiting cap.

Observe and think:

①What happens inside water?

②Think about what changes make bubbles? Is there any color?

③When will the water boil? What is the temperature when the water boils?

④How do the temperature and water volume change before the water boils?

⑤How does the temperature change when the water is continuously heated after boiling?

"Water boiling" is called "boiling" in science.

When we see bubbles popping up violently inside the water, we say that the water is really boiling and is "boiling".

water changes

What are the similarities and differences between boiling and evaporation?

Boiling - When water boils, the water quickly turns into bubbles (water vapor) and escapes into the air.

Evaporation - the phenomenon of water turning into water vapor at room temperature

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For more information about the PPT courseware "The Change of Water and the Missing Water", please click the "The Change of Water ppt and the Missing Water" ppt tag.

"The Missing Water" Water Changes PPT Courseware 4:

"The Missing Water" Changes in Water PPT Courseware 4 Observation: Boiling Water 1. What did you think of through the boiling water experiment? 2. Will the temperature still rise after the water is boiled? Experimental precautions 1. Specifications for alcohol lamps Operation method: 1) First turn on the alcohol lamp, hold the alcohol lamp with one hand,...

"The Missing Water" Water Changes PPT Courseware 2:

"The Missing Water" Changes in Water PPT Courseware 2 How to use the alcohol lamp. Standard operating methods of the alcohol lamp: 1) Use the alcohol lamp to hold the alcohol lamp with one hand and remove the lamp cap downwards with the other hand and put it aside; 2 ) Then use a lighter to light the alcohol lamp from the bottom up and from the side, and then...

"The Missing Water" Water Changes PPT Courseware:

"The Missing Water" Water Changes PPT Courseware Experiment Notes 1. Pay attention to the correct use of the alcohol lamp; 1) First turn on the alcohol lamp, hold the alcohol lamp with one hand, and remove the lamp cap with the other hand and put it aside; Then strike a match and light the alcohol lamp from the bottom up and from the side.

File Info

Update Time: 2024-07-01

This template belongs to science courseware Hunan Education Edition Fourth Grade Science Volume 1 industry PPT template

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