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Hunan Education Edition Fourth Grade Science Volume 2	pptx	6 MB

"Burning Candle" PPT

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Upload Time: 2024-11-20

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Hunan Education Edition Fourth Grade Science Volume 2, Burning Candle PPT

Part 1: Think about it

think about it

The small handful of ash remaining after burning is obviously much lighter than the original charcoal, but the weight of the entire closed container has not changed. Why is this?

Experimental methods and steps:

1. Pour a small amount of clear lime water into a clean beaker, leaving lime water droplets on the wall of the cup.

2. Place the beaker over the burning candle.

3. Observe the changes in lime water on the wall of the cup.

Experimental phenomenon: The lime water droplets on the wall of the cup turned milky white.

Explanation of the experimental phenomenon: The burning of the candle produces gas, which turns the lime water into milky white.

Burning Candle PPT, Part 2: Lavoisier’s Research

Lavoisier's research

The burned charcoal becomes lighter, and the air in the container becomes heavier, and the added weight of the air is exactly equal to the weight of the burned charcoal. It can be seen that the charcoal does not disappear without a trace during combustion, but forms a new gaseous substance together with oxygen.

This gas is what people now call "carbon dioxide".

Carbon dioxide can make clear limewater cloudy.

(This phenomenon is often used to test for the presence of carbon dioxide.)

Keywords: Hunan Education Edition fourth grade science PPT courseware for the second volume free download, burning candle PPT download, .PPT format;

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"Burning Candle" PPT courseware:

The second volume of Science for Grade 4 in Hunan Education Edition, Burning Candle PPT Courseware Part One: Asking Questions Objects in nature are ever-changing, such as seedlings being unearthed, puppies growing up, classmates growing taller, etc. These are all changes of living objects, then, there is no living thing...

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Update Time: 2024-11-20

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"Burning Candle" PPT