"Microscopic Particle Model of Matter" PPT

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"Microscopic Particle Model of Matter" PPT

Part One: Review of Molecules

1. A molecule is a particle that constitutes matter;

2. The volume and mass of molecules are small;

3. The same kind of molecules have the same properties, while different kinds of molecules have different properties;

4. Molecular kinetic theory:

① Molecules are constantly moving irregularly

② There are gaps between molecules

③ There is mutual attraction and repulsion between molecules

How many types of atoms are involved in Figure 2-6?

How many atoms are there in a molecule?

Can these atoms form other molecules?

The gray balls represent carbon atoms,

The brown balls represent nitrogen atoms,

Dark blue balls represent sulfur atoms.

Microscopic particle model of matter PPT, part 2: practice

1. Use the knowledge of atoms and molecules to analyze the essential difference between the following two changes.

(1) Water turns into water vapor when heated.

(2) Water is turned into hydrogen and oxygen by electricity.

In (1), the water molecules themselves do not change, only the distance between water molecules changes;

In (2), the water molecules are changed and new hydrogen and oxygen molecules are produced.

The essential difference between these two changes is whether the water molecules participating in the change have changed.

2. Observe the laboratory model and describe the composition of ammonia molecules.

Each ammonia molecule consists of 1 nitrogen atom and 3 hydrogen atoms.

3. When red mercury oxide powder is heated, mercury oxide molecules (one mercury oxide molecule consists of 1 mercury atom and 1 oxygen atom) will decompose into oxygen atoms and mercury atoms, and every 2 oxygen atoms combine to form 1 oxygen atom. Molecules, many mercury atoms aggregate into metallic mercury. Try to draw a model diagram of the decomposition of mercury oxide molecules.

Microscopic particle model of matter PPT, the third part: size and mass of particles

1. The atomic radius is generally on the order of 10-10 meters.

2. The mass of hydrogen molecules is on the order of 10-27 kilograms.

3. Different types of molecules and atoms have different masses and different volumes.

Number of revelations?

1. The number of molecules in a drop of water: 1021 water molecules. 1ml of water requires about 20 drops of water.

2. If water molecules are enlarged to the size of a ping pong ball, then the ping pong ball will be enlarged to the size of the earth.

3. The black writing left by the pencil is the accumulation of carbon atoms. There are actually 1018 carbon atoms in a period.

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"Microscopic Particle Model of Matter" PPT courseware:

The first part of the PPT courseware "Microscopic Particle Model of Matter": What are molecules made of? Try it. Can you use an intuitive method to express the difference between the two changes in the picture on the right? The vaporization of water is a physical change in the distance between water molecules. Get bigger. The water molecules themselves did not grow...

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Update Time: 2024-06-29

This template belongs to science courseware Zhejiang Education Edition Eighth Grade Science Volume 2 industry PPT template

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