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

Description

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

combustion definition

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?

2. Why doesn’t white phosphorus in hot water burn?

3. Can white phosphorus in hot water be burned?

Fire extinguishing principle:

1. Isolate or remove flammable materials

2. Isolate the burning material from air or oxygen

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

Want to discuss:

The following are some examples of fire extinguishing. Try to analyze the principles of fire extinguishing.

1. If the oil in the pan accidentally catches fire while cooking, you can put it out with the lid;

Isolate oxygen (or air)

2. When cartons stacked with debris catch fire, water can be used to put it out;

Reduce the temperature below the ignition point.

3. One of the effective ways to extinguish forest fires is to cut down a tree in front of the fire spreading route.

Remove flammable materials

4. Safety knowledge of flammable and explosive materials

2. Hold the lit match vertically upward. The match will not continue to burn easily. The reason is ( )

A. The temperature of the match stem does not reach the ignition point

B． The ignition point of the match stem is higher than that of the match head

C. The match stem is moist and difficult to continue burning.

D． Match stems have less exposure to oxygen

3. Why do we need to ignite paper and firewood first when lighting a coal fire?

Coal has a high ignition point, so paper and firewood are ignited first. Paper and firewood have lower ignition points, and the heat released by combustion is enough to reach the ignition point of coal.

4. Explain the fire extinguishing method and the reasons:

(1) While doing experiments, I accidentally knocked over the alcohol lamp and the alcohol burned on the table;

Use a wet rag to cover the fire or cover it with sand to extinguish the fire by isolating oxygen.

(2) The neighbor accidentally ignited the quilt due to smoking and a fire broke out;

Kill with water. The main reason is that water turns into water vapor and takes away part of the heat first, causing the temperature to drop below the ignition point.

(3) Fire occurs due to aging short circuit.

Cut off the power first, then use a fire extinguisher. Failure to cut off the power supply to extinguish the fire may cause leakage of electricity.

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

"Combustion Conditions and Principles of Fire Extinguishing" Life-Sustaining Gas Oxygen PPT Courseware 3 1. Combustion Conditions What conditions do substances need to meet to burn? Experimental exploration: Analyze wood strips, small pieces of paper, and cotton threads as combustibles; stones, glass rods, and porcelain flakes Not combustible. in conclusion ..

"Combustion Conditions and Fire Extinguishing Principles" Life-Sustaining Gas - Oxygen PPT Courseware 2:

"Combustion Conditions and Principles of Fire Extinguishing" Oxygen, the Life-Sustaining Gas PPT Courseware 2 1. Definition of combustion and combustion phenomena Normally, combustion is a violent oxidation reaction between combustibles and oxygen that produces heat and light. (As shown in the picture below, all are burning) Remarks:..

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Update Time: 2024-09-08

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

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