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Authoritative PPT Summary
"Oxidation and Combustion" PPT courseware
Part One: Oxidation Reaction
The chemical reaction between a substance and oxygen is called an oxidation reaction
Oxygen is oxidizing
H2+CuO → H2O+Cu
Inductive classification
Thinking: What the two phenomena have in common:
Iron wire burns in oxygen and rusts in moist air
Thinking: The difference between the two phenomena:
Iron wire burns in oxygen and rusts in moist air
Oxidation and Combustion PPT, Part 2: Conditions of Combustion
Condition 1: The substance that can burn must be combustible
Sodium, magnesium, phosphorus, sulfur, gasoline, kerosene, diesel, alcohol, coal, wood, cotton, linen, paper, plastic, rubber
What about oxygen?
Oxygen is not flammable
Condition 2: Combustion requires a combustion accelerant, and a common combustion accelerant is oxygen.
Condition 3: The temperature must reach the ignition point of combustibles (the lowest temperature required for combustion)
Oxidation and combustion PPT, Part 3: Fire extinguishing and fire self-rescue
Thinking: What conditions are needed for substances to burn?
(1). There are flammable materials;
(2). There is oxygen (air) to support combustion;
(3).The temperature reaches the ignition point.
What would happen if the burning substance suddenly lacked one of the above conditions? From this, have you thought of any measures to put out the fire?
1. Fire-fighting measures:
1. Isolation method: remove (or isolate) combustibles
2. Asphyxiation: Isolating oxygen (or air)
3. Cooling method: Reduce the temperature of combustibles to below the ignition point.
2. Fire extinguishers and how to use them:
1. Get the fire extinguisher
2. Pull out the safety sheath
3. Control the distance
4. Aim at the root of the fire
5. Press down the handle and spray
3. Fire escape methods
Oxidation and combustion PPT, Part 4: Energy conversion in chemical reactions
Thinking: When substances are burned, a large amount of heat is released. Where does the energy come from?
1. Exothermic reaction: the process of converting chemical energy into thermal energy.
Such as: combustion, explosion, slow oxidation, reaction between metal and acid, etc...
2. Endothermic reaction: the process of converting thermal energy into chemical energy.
Such as: potassium chlorate and potassium permanganate are heated to decompose, reaction between barium hydroxide and ammonium chloride, etc...
Keywords: Zhejiang Education Edition eighth grade science PPT courseware for the second volume free download, oxidation and combustion PPT download, .PPT format;
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"Oxidation and Combustion" PPT:
"Oxidation and Combustion" PPT Part One Content: New Lesson Introduction In the long history of human development, burning has burned away the history of eating raw materials and drinking blood; burning has ignited the glory of modern society. Combustion is inseparable from everything in life. Ask students to talk about where in their lives there is burning...