"Combustion Conditions and Fire Extinguishing Principles" Life-Sustaining Gas - Oxygen PPT Courseware 3

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"Combustion Conditions and Fire Extinguishing Principles" Life-Sustaining Gas - Oxygen PPT Courseware 3

1. Combustion conditions

What conditions do substances need to meet to burn?

Experimental exploration:

analyze

Wood sticks, small pieces of paper, and cotton thread are flammable materials;

Stones, glass rods, and porcelain tiles are not flammable.

in conclusion

For a substance to burn, it must itself be combustible.

Think about it:

Will wood sticks burn if stored at room temperature? What about after it's lit?

The wood sticks will not burn at room temperature, because the room temperature cannot reach the minimum temperature for wood sticks to burn; it will reach the minimum temperature when ignited, and the wood sticks will burn after ignition.

Experimental exploration:

Experiment: Light two candles A and B, and cover candle B with a beaker.

observe

Candle A continues to burn and candle B is extinguished soon.

analyze

Candle A burns with oxygen support; candle B goes out due to lack of oxygen.

in conclusion

To be able to burn, a substance needs to be exposed to oxygen or air

Three conditions are required for the combustion of substances

1. The substance itself is combustible;

2. The combustible material reaches the lowest temperature for combustion, that is, the ignition point;

3. Combustible materials come into contact with oxygen or air.

Similarities and Differences between Combustion and Slow Oxidation

Same point

1. They are all oxidation reactions.

2. All give off heat

difference

1. Burns violently and oxidizes slowly.

2. There is luminescence when burning, but there is no luminescence during slow oxidation.

When the heat released by slow oxidation accumulates and the temperature reaches the ignition point of the combustible, it will cause the combustible to burn automatically, which is called spontaneous combustion.

The principle of fire extinguishing:

Blow it out with your mouth and pour it out with water

Reduce the temperature of the burning material to below the ignition point.

Cover with beaker and put out with rag

Isolate the burning material from air or oxygen.

Cut the burning candle wick with scissors

Separate combustibles from other combustibles or remove combustibles.

Exercises and Practice:

During the Gulf War in 1992, a large number of oil wells in Kuwait were bombed, setting off raging fires. Our country's rescue workers took many measures during the fire-fighting process. The following does not need to be considered (D)

A. Try to isolate the flame from the air

B. Try to lower the temperature of the oil wellhead

C. Try to stop the oil injection

D. Try to reduce the ignition point of oil

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For more information about the PPT courseware "The Combustion Conditions and Fire-Extinguishing Principles of Oxygen, a Life-Sustaining Gas", please click the Combustion Conditions and Fire-Extinguishing Principles of Life-Sustaining Gas Oxygen ppt tag.

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"Combustion Conditions and Fire Extinguishing Principles" Life-Sustaining Gas - Oxygen PPT Courseware:

"Combustion Conditions and Principles of Fire Extinguishing" PPT courseware of oxygen, the life-sustaining gas. The definition of combustion. Normally, combustion is a violent oxidation reaction between combustibles and oxygen that produces heat and light. [Discussion and exchange] 1. Why does the white phosphorus on the copper sheet burn but the red phosphorus does not...

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Update Time: 2024-10-14

This template belongs to Chemistry courseware Cantonese Education Edition Ninth Grade Chemistry Volume 1 industry PPT template

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