"Thermal Motion of Molecular" Heat and Energy PPT Courseware 3

"Thermal Motion of Molecular" Heat and Energy PPT Courseware 3

1. Composition of matter:

*The molecules are very small, about 10-10m in diameter

*Huge number of molecules

Normally, there are about 2.7×1019 molecules in 1cm3 of air. If the speed of counting people could reach 10 billion per second, it would take more than 80 years to count this number.

Think: Are the molecules that make up matter stationary or moving?

2. Diffusion phenomenon:

Phenomenon 1: Gas diffusion

Phenomenon 2: Liquid diffusion

Phenomenon three: solid diffusion

Diffusion phenomenon: The phenomenon of objects in contact with each other entering each other is called diffusion.

The phenomenon of diffusion shows that the molecules of all substances are constantly moving irregularly.

summary:

1. The molecules of all substances are constantly moving irregularly;

2. The movement of molecules is related to temperature. The higher the temperature, the more intense the movement of molecules.

3. Since the motion of molecules is related to temperature, this irregular motion is called thermal motion of molecules.

Basic viewpoints of molecular kinetic theory:

1. Substances are composed of molecules;

2. The molecules that make up matter are constantly moving irregularly;

3. There is a certain gap between molecules;

4. There is both attraction and repulsion between molecules.

1: Fill in the blanks

1. The main physical knowledge involved in "Blooming flowers inside the wall and fragrance outside the wall" is ( ).

2. The diffusion phenomenon can occur between ( ), in ( ), and in ( ).

3. When red ink is dropped into hot water and cold water respectively, it can be found that the hot water changes color faster than the cold water. This shows that the higher the temperature, the thermal motion of a large number of molecules in the water ( ).

2. Multiple choice questions

1. Which of the following phenomena cannot explain that "the molecules of all substances are constantly moving irregularly" ( )

A. Spray some perfume in the room and the whole room will smell the fragrance.

B. In corners where media have been piled up for a long time, the deeper parts of the wall will also turn black.

C. When sweeping the floor in the morning, I often see dust flying indoors under the sunlight.

D. Put a piece of sugar in boiling water and the whole cup of water will become sweeter.

2. The speed of thermal motion of a large number of molecules in an object is related to the following factors ( )

A. The temperature of the object B. The speed of the object

C. The size of the object’s density D. The size of the object’s mechanical energy

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"Thermal Motion of Molecular Energy" PPT download:

"Molecular Thermal Motion" Internal Energy PPT Download Part One Content: Introductory Design Learning Point 1 Diffusion Phenomenon Experiment 1: On top of the bottle containing reddish-brown nitrogen dioxide gas, turn an empty bottle upside down so that the mouths of the two bottles face each other, with the middle Separate it with a glass plate, as shown in Figure 13-1.

"Thermal Motion of Molecular Energy" PPT:

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"Thermal Motion of Molecular" Heat and Energy PPT Courseware 4:

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