"Conditions of Combustion" PPT courseware

Description

"Conditions of Combustion" PPT courseware

What are the conditions for burning?

1. There must be flammable materials;

2. To be in contact with oxygen (or air);

3. The temperature reaches the ignition point of combustibles.

Experimental goals

1. Understand the conditions of combustion;

2. In the process of exploring the combustion conditions of substances, formulate a chemical experiment plan in cooperation with others, and be able to demonstrate the feasibility of the experimental plan.

3. Review the knowledge you have learned with combustion as the main line.

Experimental exploration 1

Experiment: Light cotton dipped in alcohol and water respectively.

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

Conclusion: Combustion requires combustibles

Thinking: Use the items on the table to design an experiment to verify that combustion requires combustibles?

Experimental exploration 2

Experiment 2: Take a piece of table tennis and filter paper, use crucible tongs to hold them over the flame of an alcohol lamp and heat them.

Phenomenon: Table tennis balls burn immediately, and filter paper fragments can also burn.

Conclusion: Table tennis balls and filter paper are both flammable materials

Questions and exchanges:

1. Explore Experiment 2 of No. 1, what will happen if the heating time is too long on the alcohol lamp? What do you think of this issue?

2. If the table tennis fragments and filter paper in Laboratory 4 are replaced with sawdust and coal powder, what will happen? (Tip: The ignition point of wood chips is lower than that of pulverized coal)

Class summary

Burning conditions Principles of fire extinguishing

1. Need combustibles 1. Isolate combustibles

2. Full contact with oxygen 2. Isolate oxygen

3. The temperature reaches the ignition point 3. Cools down to below the ignition point

practice

2. When a forest catches fire, the purpose of firefighters opening a "fire isolation zone" is ( )

A. Reduce the temperature of combustibles

B. Isolate air

C. Isolate flammable materials

D. Create a road to carry water

3． If you hold the lit match vertically upward, it will be difficult for the match to continue burning. 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

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Update Time: 2024-11-19

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

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