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Authoritative PPT Summary
"Combustion and Fire Extinguishing" Combustion and Fuel PPT (Lesson 2), 26 pages in total.
new knowledge learning
Knowledge point 1: Methods to promote combustion
Incomplete combustion and complete combustion of acetylene
(1) The acetylene gas is led out through a glass tube and ignited in the air. The acetylene ________ burns to produce carbon black (or ________) and water.
(2) Put the above burned acetylene into a gas bottle containing oxygen. The acetylene ________ burns to produce __________ and water. The chemical equation of the reaction is _______________________.
(3) Reasons for complete combustion of acetylene
After the temperature reaches ________, acetylene molecules can burn when they come into contact with oxygen molecules. In a certain space, the more ________ molecules contact and collide with each other, the more ________ they will burn.
Interactive exploration
Explore point 1: Methods to promote combustion
[Question Research] Coal is a commonly used fossil fuel. Coal for household use has changed from "briquettes" to "briquettes". Do you know why this is?
[Inductive improvement]The holes in the "briquettes" make the contact area with the air larger than that of "briquettes", which can make the coal fully contact with oxygen and burn more completely. Increasing the concentration of oxygen or increasing the contact area between combustibles and oxygen can promote the combustion of combustibles.
[Core Applications]
Core 1: Methods to promote combustion
Example 1: As the old saying goes, "People need to be strong, and fire needs to be weak." The meaning of "fire needs to be weak" means: When burning firewood, it is usually more elevated so that it can burn more vigorously. The essence of "fire needs to be weak" is ()
A. The speed of heat dissipation is accelerated B. Increase the contact area between firewood and air
C． The ignition point of firewood is reduced D. Increase the oxygen content in the air
[ Analysis oxygen content.
Class feedback
Knowledge point 3: Methods to promote combustion
3． In order to fully burn coal and achieve the purpose of energy conservation and emission reduction, the correct and reasonable measures are ()
A. Increase the amount of coal B. Crushed coal
C． Improve the heat resistance of the boiler D. Reduce air intake
4． Which of the following statements about explosions is correct ()
A. An explosion is the result of violent combustion of gaseous substances, so chemical changes must occur
B． An explosion is a phenomenon that occurs when the volume of a gas expands rapidly within a confined space, which may be caused by a chemical change or a physical change
C． Explosions will be accompanied by glowing and heating phenomena
D． Explosion is the inevitable result of slow oxidation
Keywords: Free download of Chemistry PPT courseware for the first volume of the ninth grade of the Lujiao Education Edition, PPT download of combustion and fire extinguishing, PPT download of combustion and fuel, .PPT format;
For more information about the "Combustion and Fuel Combustion and Fire Extinguishing" PPT courseware, please click on the Combustion and Fuel PPT Combustion and Fire Extinguishing PPT tab.
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