"Conditions of Combustion" Fuel and its Utilization PPT Courseware 5

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"Conditions of Combustion" Fuel and its Utilization PPT Courseware 5

What is combustion?

Combustion is usually a violent oxidation reaction between combustibles and oxygen that produces light and heat.

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.

【Kind tips】:

1. Each group prepares a wet rag for later use.

2. Do not take the burning material too large.

3. After the group experiment, make sure the flame is extinguished before doing the next experiment. Observe the experiment from the side to prevent the flame from burning your body.

Experimental study one

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 two

Experiment 1: 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)

Summary and review:

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

Exercises and Practice:

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. 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 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

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Update Time: 2024-10-08

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