"Molecules and Atoms" The Mystery of Material Composition PPT Courseware 5

Description

"Molecules and Atoms" The Mystery of Material Composition PPT Courseware 5

1. Matter is composed of molecules, atoms and other particles

For example: water is made of water molecules, oxygen is made of oxygen molecules, and mercury is made of mercury atoms.

Made of molecules: water and most gases (except rare gases), etc.,

Such as: H2O, H2, O2, N2, NH3, CO2, SO2

Directly composed of atoms: metals, rare gases and non-metallic solids,

Such as: Mg, Fe, Cu, He, Ne, Ar, P, S, C, Si

2. Properties of molecules:

1. The mass and volume of molecules are small

2. Molecules are constantly moving. As the temperature increases, the movement of molecules accelerates.

3. There are gaps between molecules

Generally speaking, gas > liquid > solid

Concept of molecules and atoms

1. Molecule: A substance composed of molecules, which are the smallest particles that maintain their chemical properties.

2. Atom: Atom is the smallest particle in chemical changes.

Happy Meal

1. "There are several plum blossoms in the corner, and Ling Han blooms alone. I know it's not snow from a distance, because there is a faint fragrance." (Wang Anshi's "Plum Blossoms") The reason why the poet can smell the faint fragrance of plum blossoms in the distance is ( )

A. The molecules are very small

B. Molecules are constantly moving

C. There are gaps between molecules

D. The molecule is divisible

2. Explain the following phenomena from a molecular perspective:

(1) As the saying goes, "The aroma of wine does not fear the depth of the alley."

Molecules are constantly moving

(2), the mixing volume of 50ML water and 50ML alcohol is 100ML smaller;.

There is a certain distance between molecules

4. Differences and connections between molecules and atoms

1. Difference: In chemical changes, molecules can be divided into atoms, but atoms cannot be divided again.

2. Contact:

① Some substances are composed of molecules, and some substances are directly composed of atoms, so molecules and atoms are particles that constitute matter.

②Molecules are made up of atoms

The same kind of atoms form single molecules, such as O2 molecules and H2 molecules

Different types of atoms make up compound molecules, such as H2O molecules

5. Comparison between molecules and atoms

The same points are that the basic particles that make up matter have small mass, constant movement, and separation.

Difference (essential difference) In chemical changes, molecules can be subdivided, but atoms cannot be subdivided.

Interrelationships Molecules can be split into atoms, and atoms can combine with each other to form molecules; molecules and atoms are particles that make up matter.

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"Molecules and Atoms" The Mystery of Material Composition PPT Courseware 9:

"Molecules and Atoms" The Mystery of Material Composition PPT Courseware 9 Learning Objectives 1. Know that molecules are composed of atoms 2. Be able to explain physical changes and chemical changes from the perspective of molecules and atoms; 3. Understand the concepts of molecules and atoms. Learning focuses on understanding molecules. It's about keeping things..

"Molecules and Atoms" The Mystery of Material Composition PPT Courseware 8:

"Molecules and Atoms" The Mystery of Matter Composition PPT Courseware 8 Lesson 1 Matter is composed of microscopic particles Why can people be intoxicated by the refreshing fragrance of flowers when walking in the garden? [Experiment] Magenta diffuses in water 1. Why does magenta in still water...

"Molecules and Atoms" The Mystery of Material Composition PPT Courseware 7:

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Update Time: 2024-11-25

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