"Exploring the Conditions of Combustion" Quantitative Study of Chemical Reactions PPT

Description

"Exploring the Conditions of Combustion" Quantitative Study of Chemical Reactions PPT, 18 pages in total.

Experimental study one

Dip cotton in alcohol and water respectively, put it on an alcohol lamp and heat it for a while to observe the phenomenon.

Experimental phenomenon: Cotton dipped in alcohol can burn, but cotton dipped in water cannot burn.

Experimental conclusion: Alcohol is flammable, but water is not flammable

If you were given a fire, which of the following substances could you ignite?

Stones, wood strips, glass pieces, cotton

Through this experiment, one of the conditions for combustion is explained: the substance is flammable

Questions and exchanges

1. In the above experimental step 1, what will happen if the cotton dipped in water is heated on the alcohol lamp for too long? Can you explain why?

Cotton dipped in water will still burn if heated over an alcohol lamp for too long, because the water on the cotton has evaporated, and cotton is flammable and flammable, so the cotton will continue to burn.

2. The use of fire marks the great progress of human civilization, from drilling flints to make fire to aerospace. In short, our lives are inseparable from "fire". However, improper use of fire may cause fire, so when a fire occurs, we hope to put out the fire quickly. In fact, it is not necessary to put out fires only when a fire breaks out. Fire extinguishing is actually something that is often done in life. Please look at the following example of how to put out a fire? What is its principle?

① Extinguish the alcohol lamp; ② Forest fire; ③ Building fire; ④ The cooking pot catches fire; ⑤ Alcohol is sprinkled on the table and burns; ⑥ Aged wires and short circuits cause fire; ⑦ Smoking accidentally ignites mosquito nets

Practical exercise one

1. The reason why paper ignites more easily than coal is ( )

A. Paper has a larger contact area with air than coal

B. Paper has a higher ignition point than coal

C． Paper has a lower ignition point than coal

D． Paper is less dense than coal

2. If the lit match is held 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

Section

Burning conditions:

1. The substance is flammable

2. The temperature of the combustible reaches its ignition point

3. The combustible material is in contact with sufficient oxygen (or air). Meaning

The principle of fire extinguishing:

1. Remove flammable materials

2. Cool down the temperature

3. Isolate oxygen (or air)

Keywords: Free download of Chemistry PPT courseware for the first volume of the ninth grade of the Lujiao Education Edition, PPT download to explore the conditions of combustion, PPT download to quantitatively study chemical reactions, .PPT format;

For more information about the "Quantitative Study of Chemical Reactions to Explore the Conditions of Combustion" PPT courseware, please click the "Quantitative Study of Chemical Reactions PPT to Explore the Conditions of Combustion" PPT tag.

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Update Time: 2024-10-03

This template belongs to Chemistry courseware Lu Jiao Edition Ninth Grade Chemistry Volume 1 industry PPT template

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