"Molecules and Atoms" PPT courseware on the mystery of matter composition

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"Molecules and Atoms" PPT courseware on the mystery of matter composition

1. Learning objectives:

1. Know that molecules and atoms are the particles that make up matter.

2. Can use the perspective of particles to explain some phenomena in daily life. (emphasis)

3. Gradually develop microscopic imagination and abstract thinking abilities in the process of observing and analyzing experimental phenomena. (difficulty)

2. Independent learning:

Knowledge point 1: Particles of matter: Matter is composed of tiny particles - ____, ____ and ____, etc.

Knowledge point 2: Basic properties of molecules:

1. Both ____ and ____ of the molecule are very small.

2. Molecules are always ________; as the temperature increases, the movement of molecules ____.

3. There are ____ between molecules; the distance between gas molecules ____ the distance between liquid molecules ____ the distance between solid molecules.

【Explore and communicate】

(1) Why choose ammonia water for the experiment?

Ammonia is easy to evaporate, and the phenomenon can be seen quickly.

(2) Why do the particles of ammonia water enter the phenolphthalein, but not the particles of phenolphthalein enter the ammonia water? What does this mean?

Ammonia is easily volatile and ammonia molecules move quickly; this shows that different particles move at different speeds.

(3) Ammonia gas and water are dissolved in concentrated ammonia water, so is it possible that it is water molecules rather than ammonia molecules that can make the phenolphthalein solution turn red?

It will not be water molecules, because Experiment 1 has already proved that water cannot make phenolphthalein solution turn red.

5. Classroom exercises: Textbook P51~52 Questions 1 and 2

1. Among the following items, it cannot be proved that there is a gap between molecules ( )

A. Red ink is dropped into the water, and after a while the water will all turn red.

B. The volume of water increases when it is heated and turns into water vapor.

C. When 1 volume of soybeans and 1 volume of millet are mixed together, the total amount is less than 2 volumes

D. After mixing 100mL alcohol and 100mL water, the total volume is less than 200mL.

2. Which of the following views do you think is incorrect? ( )

A. The world is material, and matter is made of molecules.

B. From a macroscopic perspective, matter in a stationary state is in perpetual motion from a microscopic perspective.

C. Although molecules are small, they still have a certain mass and volume.

D. When the weather clears after a rain in summer, the water stains on the road surface quickly dry up and the water no longer exists.

3. Use the molecular point of view to explain the following phenomena. Which one is unreasonable ( )

A. Food spoilage - the molecules themselves have changed

B. Gasoline volatilizes - molecular size changes

C. Thermal expansion and contraction - changes in the distance between molecules

D. The fragrance of flowers is overflowing - molecules are diffusing

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Update Time: 2024-11-24

This template belongs to Chemistry courseware People's Education Press Ninth Grade Chemistry Volume 1 industry PPT template

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