"What changes have occurred in matter" Changes in matter PPT courseware 3

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"What changes have occurred in matter" Changes in matter PPT courseware 3

How do material changes occur? In life, we often need to mix some substances, such as mixing condiments and vegetables when cooking.

Do substances change when they are mixed with each other?

Pour the sand in the cup into the cup with beans and mix and stir. Did the sand change during the process of mixing the sand and beans? Have the beans changed?

Use a sieve to separate the mixture of sand and beans. Have they changed compared to the original sand and beans?

Conclusion: We observed no significant changes in them.

Note: Observing "no significant change" is equally important as observing "significant change".

Observe changes in sugar

Use a long-handled metal spoon to take a small spoonful of sugar, carefully transfer it to the candle flame and heat it slowly. Predict what will happen to the sugar. When the heating is complete, extinguish the candle, place the spoon on a plate in the middle of the table to cool, and record the observations.

Experimental requirements

1. Operate the student to hold the top part of the iron spoon handle;

2. Place the iron spoon on the outer flame to heat;

3. Don’t get too close to the iron spoon when observing;

4. Use multiple senses to observe changes in sugar and record them in time; (state, color, smell, etc.)

5. After heating, place the iron spoon on the plate, do not touch the heated part with your hands, and extinguish the candle.

The changes I observed in the burning of the candle

The rope and wax oil in the candle wick burn, and the candle changes from solid to liquid.

When the candle burns (reacts with oxygen in the air) to generate carbon dioxide and water, a chemical change occurs (new substances are generated). When the candle burns, a part of the candle melts and changes to wax oil, and a physical change occurs (the three states of matter). Change is a physical change). Therefore, the candle burning process involves both chemical changes and physical changes.

Matter changes either quickly or slowly. Some changes only change the shape, volume, state, etc. of matter, but do not produce new matter that is different from the original. We call such changes physical changes. Some changes produce new substances. We call changes that produce new substances chemical changes.

The essential difference: is there any new substance generated?

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"What Changes Happened to Matter" PPT teaching courseware on changes in matter:

"What changes have occurred in matter" PPT teaching courseware on changes in matter Part 1: Review: What changes have you observed? Changes that only change the state, shape, size, etc. of matter without producing new matter are called physical changes. New substances are generated...

Download PPT "What Changes Happened to Matter": Changes in Matter:

"What Changes Have Happened to Matter" Changes in Matter PPT Download Part One Content: New Lesson Exploration (1) Observing Sand and Beans Experimental Conclusion: The characteristics and properties of beans and sand have not changed, sand is still sand, and beans are still beans. That is, the matter does not change. observe..

"What changes have occurred in matter" Changes in matter PPT:

"What happened to matter?" Changes in matter PPT Part 1: Mixing sand and beans Pour the sand and beans on the white paper, observe and describe their characteristics. Pour the sand in the cup into the cup with beans and mix and stir. In the mixture of sand and beans..

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Update Time: 2024-11-20

This template belongs to science courseware Science Edition for Sixth Grade Science Volume 2 industry PPT template

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