"Molecules and Atoms" The Mystery of Material Composition PPT Courseware 3

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"Molecules and Atoms" The Mystery of Material Composition PPT Courseware 3

Why do people feel moist in air where water evaporates? Will there be clouds in the sky?

Why can people be intoxicated by the refreshing fragrance of flowers when walking in the garden?

In standing water, why does the liquid turn red after the magenta diffuses?

There are countless examples in our daily lives that can prove that when we carefully observe substances changing from visible to invisible, we can often still feel their existence. These facts fully demonstrate that matter is composed of countless invisible particles.

What properties do molecules have?

Why can’t we see ammonia molecules entering the phenolphthalein solution?

⒈ The mass and volume of molecules are small.

Why can ammonia molecules diffuse into the air and enter the phenolphthalein solution?

⒉ Molecules are always in constant motion.

⒊ There are gaps between molecules.

⒈ Analyze and explain from a molecular perspective why the colored gases in the diagram below diffuse?

⑴ Molecules are always in constant motion.

⑵There are gaps between molecules.

⒉ Can oxygen and nitrogen with different densities be mixed evenly in the air?

Nitrogen dioxide is denser than oxygen and also denser than nitrogen.

⒊ After the gases in the upper and lower bottles are evenly mixed (the colors of the gases in the upper and lower bottles are exactly the same), does the movement of the molecules in the bottles stop?

Analyze and explain the following questions from a molecular perspective:

1. Taking air and oxygen as examples, what is the difference between a mixture and a pure substance?

⒉Why can you smell the fragrance of flowers outside the wall when they bloom inside the wall?

⒊Are wet clothes easier to dry in the sun and in a ventilated place than in a cool and leeward place?

⒋Why should perfume, gasoline, and alcohol be kept sealed?

⒌After water evaporates, its chemical properties do not change.

⒍25m3 of petroleum gas can be put into a 0.024m3 cylinder under pressurization.

Decide whether the following statements are correct and explain why.

⑴ The molecular properties of the same substance are the same, while the molecular properties of different substances are different.

⑵ The same kind of atoms can be combined into molecules, but different kinds of atoms cannot be combined into molecules.

⑶ Air is composed of air molecules.

⑷ When nitrogen and oxygen in the air are mixed, their chemical properties have changed.

[Example 1] Which of the following statements is correct ( )

A. During the freezing process of water, the physical properties of water molecules change, but the chemical properties remain unchanged.

B． Clean air is a pure substance, water with ice cubes is a mixture

C. Pure substances are molecules that do not contain any impurities

D． After mixing 20 mL of alcohol and 20 mL of water, the total volume of the solution is less than 40 mL

[Example 2]As shown in the figure below, there is brown bromine vapor in a closed container. When the piston is pushed to the left, what phenomenon is seen? What problem does it indicate?

[Example 3]The essential difference between atoms and molecules is ( )

A. Molecules are big, atoms are small

B． Molecules can constitute matter, but atoms must first form molecules and then form matter.

C. In chemical reactions, molecules can be divided, but atoms cannot be divided.

D． Molecules can retain the chemical properties of matter, while atoms cannot

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

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Update Time: 2024-11-23

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