"The Missing Water" Water Changes PPT Courseware 4

Description

"The Missing Water" Water Changes PPT Courseware 4

Observation: Boil water

1. What did you think of through the boiling water experiment?

2. Will the temperature still rise after the water is boiled?

Experimental Notes

1. Standard operation method of 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 down and aside;

2) Then strike a match and light the alcohol lamp from the bottom up from the side, and then throw out the match;

3) When extinguishing, take out the alcohol lamp first to prevent hand burns, and cover the lamp cap directly without blowing with your mouth;

4) During the experiment, do not touch the burning alcohol lamp and beaker.

2. Be careful not to burn or knock over the equipment.

3. The team leader assigns tasks.

4. Keep experimental records.

Experimental notes:

(1) How does the temperature change before boiling? How does it change after boiling?

(2) What phenomena occur in water when it boils? How does the size of bubbles change before and after boiling? It is not necessary to study the cause of bubbles in detail?

Experimental Notes

1. Pay attention to the correct use of alcohol lamps;

2. When using the thermometer, do not place it against the wall of the test tube. When reading, keep your eyes level with the scale.

3. Keep experimental records.

boil water

Experimental equipment - alcohol lamp, tripod, asbestos net, beaker, thermometer, etc.;

Phenomenon----A large number of bubbles emerge from the water, and the water quickly turns into water vapor;

The temperature at which water boils is 100°C (under 1 standard atmosphere), and the temperature no longer rises after the water boils.

water changes

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

The temperature rises to the boiling point and remains unchanged, but the amount of water decreases significantly

The phenomenon of violent bubbles emerging from the inside of water is called "boiling" of water. In popular terms, it is "water boiling", and "water boiling" is scientifically called "boiling".

When using the thermometer, do not place it against the wall of the test tube. When reading, keep your eyes level with the temperature above the thermometer.

When water boils, the temperature remains unchanged at 100°C (under 1 standard atmosphere). This temperature is called the "boiling point" of water. After the water reaches the "boiling point", the temperature no longer rises.

Expand and extend

Talk about the boiling phenomenon in life and the application of related principles in life.

For example: water boils when cooking rice and oil boils when cooking.

When the soup is boiling, the soup is boiling...;

Using the principle of boiling to extract sea salt from sea water...

Keywords: water changes teaching courseware, missing water teaching courseware, Hunan Education Edition fourth grade science PPT courseware download, fourth grade science slide courseware download, water changes PPT courseware download, missing water PPT courseware download, .PPT format;

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

"The Missing Water" Water Changes PPT Courseware 3:

"The Missing Water" Changes in Water PPT Courseware 3 Discussion: 1. Where did the water in the teacher's hands 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? The water becomes a colorless, odorless,...

"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: 2024-06-30

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

Preview