"Moving Water Molecules" Exploring the Water World PPT (Lesson 1)

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"Moving Water Molecules" Exploring the Water World PPT (Lesson 1), 22 pages in total.

1. Course introduction

How to distinguish physical changes from chemical changes? Why are the following two changes physical changes?

three states of water

2. Introduction to new courses

1. Three state changes of water

Thinking: If you boil a small amount of water enclosed in a syringe, what will happen to the syringe?

Have the water molecules themselves grown larger?

The distance between water molecules has become larger?

The number of water molecules increased?

When the water molecules are heated, they move to the other end of the needle?

2. Molecule

Molecules are basic particles that make up matter, and they are all made up of atoms.

in conclusion

(1) The mass and volume of molecules are small.

(2) There is a gap between them. (The distance between gas molecules is larger, and the distance between solids and liquids is smaller. The distance between molecules increases as the temperature increases and decreases as the temperature decreases).

(3) Molecules have energy and are always in constant motion. (Gaining energy, the movement speed increases; losing energy, the movement slows down)

(4) There are interactions between molecules. (Thus, molecules come together to form substances)

3. Practice in class

1. In the park in July, flowers are in full bloom, and the fragrance of flowers is refreshing. Explanation of the phenomenon of overflowing flowers ( )

A. Molecules are in constant motion B. Molecules have a certain mass

C． Molecules are made of atoms D. There is a certain distance between molecules

2. Which of the following facts cannot be explained by knowledge about molecules ( )

A. Dust flies when the wind blows

B． Enter the garden and smell the flowers

C． Put 25m3 of petroleum gas into a 0.024m3 cylinder

D． The volume after mixing 50mL alcohol and 50mL water is less than 100mL

4. Class Summary

In this lesson, we explored the properties of molecules through experiments and were able to explain the difference between physical changes and chemical changes from a microscopic perspective. Through the activity world, we learned that the characteristics of molecules are small size, gaps between molecules, and constant movement.

Keywords: Free download of Chemistry PPT courseware for the first volume of the ninth grade of the Lujiao Education Edition, PPT download of moving water molecules, PPT download of Exploring the Water World, .PPT format;

For more information about the PPT courseware "Exploring the Water Molecules in Movement in the Water World", please click on the "Exploring the Water Molecules in Movement in the Water World" PPT tag.

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Update Time: 2024-12-11

This template belongs to Chemistry courseware Lu Jiao Edition Ninth Grade Chemistry Volume 1 industry PPT template

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