"Exploring Combustion and Fire Extinguishing" Knowledge of Combustion PPT Courseware 2

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"Exploring Combustion and Fire Extinguishing" Knowledge of Combustion PPT Courseware 2

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1. The definition of combustion.

2. Three conditions required for combustion.

3. Principles and methods of fire extinguishing.

1. Combustion definition:

A violent oxidation reaction that produces light and heat between combustibles and oxygen.

2. The combustion of substances generally requires three conditions:

1. Combustibles

2. Oxygen (or air)

3. Reach the minimum temperature required for combustion (i.e. ignition point)

The three conditions must be met at the same time, one of them is indispensable.

Comparison of combustion conditions and fire extinguishing principles:

The conditions for burning are the principles of fire extinguishing

1. Combustibles 1. Remove (or isolate) flammable materials

2. Oxygen (or air) 2. Isolate oxygen (or air)

3. The temperature reaches the ignition point 3. The temperature drops below the ignition point

(Three conditions must be met at the same time) (One of the three conditions must be met)

3. Principle of fire extinguishing:

Destroy the conditions for combustion and stop the combustion reaction.

1. Remove combustibles or isolate combustibles from other items

2. Isolate oxygen (or air)

3. Reduce the temperature to below the ignition point

Summary: Burning and extinguishing

burning conditions

① Combustibles ② Oxygen (or air) ③ Reaching the ignition point

Principles of fire extinguishing

①Remove (or isolate) combustible materials

②Isolate oxygen (or air)

③Reduce the temperature to below the ignition point

1. Which of the following statements about combustion is incorrect ( )

A. Changes that produce heat and light are not necessarily combustion.

B. Substances that cannot burn in oxygen cannot burn in air.

C. When combustibles burn, they must emit light and heat.

D. When combustibles burn, there must be flames and light.

2. After a forest fire, when the fire spreads too fast and cannot be extinguished, firefighters usually open a "fire isolation zone" for the purpose of ( )

A. Reduce the ignition point of combustibles

B. Convenient to transport water

C. Isolate flammable materials

D. Isolate the air

3. Water can be used to extinguish burning wood because ( )

A. Water evaporates and absorbs heat, reducing the ignition point of wood.

B. Water is denser than wood

C. Water evaporates and absorbs heat, increasing the ignition point of wood.

D. A large amount of water evaporates and absorbs heat, lowering the temperature below its ignition point, and the water vapor takes off again to isolate combustibles from the air.

4. When a liquefied petroleum gas leak is discovered at night, the emergency measures that should be taken are ( )

A. Spray water into the room to dissolve the liquefied petroleum gas and prevent it from continuing to burn.

B. Turn on the light and carefully check the source of leakage

C. Close the air source valve and open all doors and windows for ventilation

D. Call the police and ask maintenance personnel to come for repairs.

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For more information about the PPT courseware "The Knowledge of Combustion Exploring Combustion and Fire Extinguishing", please click the "The Knowledge of Combustion ppt Exploring Combustion and Fire Extinguishing" ppt tag.

"Exploring Combustion and Fire Extinguishing" PPT Courseware on Combustion 3:

"Exploring Combustion and Fire Extinguishing" Combustion Knowledge PPT Courseware 3 Learning Objectives 1. Knowledge and Skills: Use chemical science knowledge to explain some phenomena and causes of combustion and fire extinguishing in daily life. 2. Processes and Methods: Through understanding of combustion conditions and fire extinguishing Exploration activities on principles, etc..

"Exploring Combustion and Fire Extinguishing" PPT courseware on combustion knowledge:

"Exploring Combustion and Fire Extinguishing" Combustion Knowledge PPT Courseware Combustion: It is a violent chemical reaction that emits light and releases heat Note: 1 Combustion is an exothermic reaction 2 Chemical reactions Exothermic reaction Endothermic reaction Exothermic reaction: There are All chemical reactions that release heat...

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Update Time: 2024-11-22

This template belongs to Chemistry courseware Beijing Curriculum Reform Edition Ninth Grade Chemistry Volume 1 industry PPT template

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