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"Conditions of Combustion" Fuel and its Utilization PPT Courseware 2
Scenario import
During the holidays, a small fire broke out in the storage room where debris was stored in our school. Because the fire was put out in time, it did not cause major losses.
When firefighters arrived at the scene, they discovered several strange phenomena:
The area where the alcohol was placed was severely burned, but the area where the salt solution was placed was not burned.
Placing a ping pong ball has a different ignition time than a book.
Firefighters used water-based fire extinguishers to put out the fire.
Guess, think about it
Exploration 1 Why was the place where the alcohol was placed severely burned, but the place where the salt solution was placed was not burned?
Exploration 2 Why are the ignition times of placing table tennis balls and books different? Which one is ignited first?
Design experiment What is the fire extinguishing principle of water-based fire extinguisher? Design experiments to prove that combustion requires air (oxygen)
Exploration experiment 1
Questions and exchanges
What will happen if the heating time on the alcohol lamp is longer? Can you explain why?
When heated over an alcohol burner for a longer period of time, both cotton balls will burn. The reason is that the heat released by the burning of the alcohol in the cotton ball dipped in alcohol is transferred to the cotton ball, causing the temperature to rise to the ignition point of the cotton, causing the cotton to burn; when the water in the cotton ball dipped in water evaporates, the cotton ball is exposed to the The temperature rises in the flame of the alcohol lamp, and the cotton ball comes into contact with the air, which also meets the three conditions required for combustion, causing the cotton to burn.
Exploration experiment 2
Questions and exchanges
What would happen if the table tennis fragments and filter paper were replaced with sawdust and coal powder for the experiment? What does it mean?
The wood chips were ignited before the pulverized coal, indicating that combustibles with a low ignition point are easy to burn, while combustibles with a high ignition point are not easy to burn.
Design experiment 3
Verification target
The principle of a water-based fire extinguisher is to isolate air (oxygen), and one of the conditions for verifying combustion: oxygen (or air) is required
experimental design
You can design experiments using candles and beakers (or choose other supplies)
Experimental phenomena and conclusions
This shows that one of the conditions for combustion is: combustible materials
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