"Invisible Movement" Small Particles and the Big Universe PPT Courseware

Description

"Invisible Movement" Small Particles and the Big Universe PPT Courseware

We know that matter is made up of a large number of molecules, what else do you want to know?

How are the molecules of matter arranged?

Are there strong interactions between molecules?

Do molecules move?

What's your guess?

Molecules of solids and liquids may be squeezed together one by one, while there are gaps between gas molecules.

The molecules of solids may be stationary, while the molecules of liquids and gases may be mobile.

There is gravity between molecules, otherwise there would be no matter.

What can be learned through observation?

When water and alcohol are mixed, the total volume is ___ higher than expected. Although the molecules in the substance cannot be directly seen with the naked eye, the above experiment shows that there is indeed ________ between the molecules.

Discussion and inquiry

1. The Olympic Games "Auspicious Cloud" torch also came to our Wuhu for relay. If you are a torch bearer and you get the torch and light it and burn it, is the smoke that your seatmate sees coming out a molecular movement?

From the above two experimental phenomena, we can know:

There is both attraction and repulsion between molecules. It is difficult for objects to be pulled apart, indicating the existence of attraction between molecules; it is difficult for objects to be compressed, indicating the existence of repulsion between molecules.

(1) Solid: Molecules are very close and regularly packed together. Therefore, a solid has a certain volume and shape.

(2) Liquid: molecules close together. Within certain limits, molecules can move or slide, so liquids have a certain volume but not a certain shape.

(3) Gas: The molecules are relatively far apart and can move freely in all directions. Therefore, gas has no fixed shape and definite volume.

test you

1. "The fragrance of osmanthus in August". You can smell the fragrance of osmanthus from a long distance. This is a diffusion phenomenon; it shows __________; an iron rod is difficult to compress because there are __________ between molecules; glue can hold Two pieces of paper stick together because of the presence of __________ between molecules.

2. Among the following phenomena, which one can show that the molecules of an object are constantly moving ( )

A. There are many small insects moving around in the dirty water without any pattern.

B. Put mothballs in the suitcase. After a while, the clothes will smell like camphor.

C. When the classroom was being cleaned, dust was flying all over the room.

D. When a car passes by, the dust moves behind the car.

3. Smoking is harmful to health. The International Health Organization has stipulated the "World Smoking Smoking Day", and signs of smoke-free places can be seen everywhere. Because when one person smokes in a public place, other people will also "passively smoke". Use the knowledge learned in this section to explain the reasons for this result.

Answer: Gas molecules are constantly moving irregularly, and they can reach the space they can reach.

Operation:

1. Contents of this section of basic training

2. Practical activities: Continue to complete the research on molecular motion in this lesson.

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"Invisible Movement" Small Particles and the Big Universe PPT Courseware 4:

"Invisible Movement" Small Particles and the Big Universe PPT Courseware 4 Learning Objectives 1. Know that matter is composed of molecules, and the molecules of all matter are constantly moving irregularly. 2. Be able to identify diffusion phenomena and explain them from the perspective of molecular thermal motion. 3. Know..

"Invisible Movement" Small Particles and the Big Universe PPT Courseware 3:

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"Invisible Movement" Small Particles and the Big Universe PPT Courseware 2:

"Invisible Movement" Small Particles and the Big Universe PPT Courseware 2 Matter is composed of molecules. How are the molecules arranged? Are there gaps like a team of soldiers or are they airtight like a wall? Matter is composed of a large number of molecules. What else do you want to know? The division of matter..

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Update Time: 2024-11-22

This template belongs to Physics courseware Shanghai Science Edition 8th Grade Physics industry PPT template

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