"Combustion and Fire Extinguishing" Fuel and its Utilization PPT (Lesson 2)

Description

"Combustion and Fire Extinguishing" Fuel and its Utilization PPT (Lesson 2), 14 pages in total.

Introduction of new courses

"The sound of firecrackers brings the end of the year." Setting off fireworks is one of the long-standing Spring Festival customs. The cheerful sound of firecrackers adds a lot of festive atmosphere to the happy and peaceful Spring Festival.

In fact, setting off firecrackers is an explosion caused by burning gunpowder in a very small space.

New lesson explanation

1. Causes of explosions and explosion prevention measures

1. Causes of explosion:

When the content of flammable gas or combustible dust in the air reaches the explosion limit, it will burn violently when exposed to an open flame, causing a large amount of heat to accumulate in a limited space in a short period of time, causing the volume of the gas to expand rapidly, thereby causing an explosion. .

2. Explosion-proof measures: Fireworks must be strictly prohibited in places where combustible materials exist!

[Thinking] Gas stations, oil depots, flour processing plants, textile mills and coal mines are all marked with "No Fireworks" words or icons. Do you know the reason?

The air in these places is often mixed with flammable gases or dust, which may explode when exposed to open flames.

2. Icons related to burning and explosions

[Thinking] We are exposed to many flammable and explosive substances in production and life. What should we do?

When producing, transporting, using and storing flammable and explosive materials, relevant regulations must be strictly followed, and illegal operations are never allowed.

Summary

1. When the content of flammable gas or combustible dust in the air reaches the explosion limit, it will burn violently in a limited space when exposed to an open flame, causing an explosion.

2. Fireworks must be strictly prohibited in places where flammable materials exist!

Reinforcement exercises

1. In order to avoid gas (including methane and carbon monoxide) explosions in mines, which of the following measures is incorrect ()

A. Reduce the ignition point of gas gas B. Strictly prohibit fireworks

C. Check whether the circuit is damaged D. Improve ventilation capacity

2. The sign that should be affixed to the warehouse where fireworks and firecrackers are stored is ()

3. Frequent chemical leaks or explosions in recent years have repeatedly sounded safety alarms for us. Improper operation will cause safety hazards. Which of the following is correct ()

A. When heating the liquid in the test tube, the mouth of the test tube can be facing yourself or others.

B. The waste gas from iron smelting plants contains a large amount of CO and is directly discharged into the air without treatment.

C. Fireworks are strictly prohibited in oil depots, flour mills, textile factories, and coal mines.

D. When a natural gas leak occurs in the kitchen at night, you should immediately turn on the lights to check and open the doors and windows for ventilation.

Homework

The main component of domestic natural gas is methane. To prevent gas leakage, a gas leak alarm can be installed in the kitchen.

(1) Should the alarm be installed above or below the kitchen? Why?

(2) When the gas combustion is insufficient, the flame will appear yellow and black smoke. At this time, the amount of air or gas entering the gas stove can be adjusted. How to adjust it?

Keywords: Free download of PPT courseware for the ninth grade of Chemistry from the People's Education Press, PPT download of combustion and fire extinguishing, PPT download of fuels and their utilization, .PPT format;

For more information about the PPT courseware "Fuel and Its Utilization, Combustion and Fire Extinguishing", please click the Fuel and Its Utilization PPT Combustion and Fire Extinguishing PPT tab.

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Update Time: 2024-08-02

This template belongs to Chemistry courseware People's Education Press Ninth Grade Chemistry Volume 1 industry PPT template

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