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"The Missing Water" Water Changes PPT Courseware 2
Use of alcohol lamp
Standard operation method of alcohol lamp:
1) Use an alcohol lamp, hold the alcohol lamp with one hand, and remove the lamp cap with the other hand and put it down to the side;
2) Then use a lighter to light the alcohol lamp from bottom to top and from the side, and then extinguish the lighter;
3) When extinguishing, take out the alcohol lamp first to prevent hand burns. Do not blow with your mouth and cover the lamp cap directly;
Share our observations
1. The unit of this thermometer: ℃
2. Each large grid is: 10℃. Each small grid is: 1℃.
3. The highest temperature is: 100℃ and the lowest temperature is: 0℃
4. When measuring the water temperature, the red liquid column inside will rise as the water temperature changes.
How to use a thermometer correctly
1. Hold the top of the thermometer in your hand.
2. Immerse the lower end of the thermometer in the water without touching the bottom and wall of the container.
3. Keep your sight level with the liquid level of the thermometer.
4. Take the reading when the liquid column no longer rises or falls.
5. The thermometer cannot leave the water being measured when reading.
Kind tips:
During the experimental operation, do not touch the burning alcohol lamp and flask to avoid burns;
Do not drink boiled water, it is not safe;
The alcohol lamp should be lit outside and then heated under the test tube. When it is extinguished, 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;
Be careful not to burn or knock over the equipment.
The team leader assigns tasks and keeps experimental records.
Observed phenomena:
During the heating process, the water surface gradually rises, the bottom of the water gradually bubbles, and the water temperature rises linearly. At a certain point, "white gas" appears on the water surface. When the water is about to boil, a large number of bubbles are generated. After the water is boiled, the temperature will not change if it continues to be heated, but the water will gradually Fewer.
Summary: Boil water
Experimental equipment - alcohol lamp, iron stand, flask, thermometer, water, etc.;
Phenomenon: A large number of bubbles emerge from the water, the water temperature rises linearly, and at a certain point, "white gas" appears on the water surface.
The temperature at which water boils is 100°C (normally), and the temperature no longer rises after the water boils.
Expand and extend
Ask questions you still want to research:
like:
1. During the process of boiling water, why does the water level rise?
2. In addition to changes in water temperature, what other phenomena have been observed?
Share the observed phenomena with everyone.
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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:
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"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:
"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.