"Molecular" PPT courseware of particles that constitute matter

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"Molecular" PPT courseware of particles that constitute matter

Can you clearly explain the following phenomena?

1. The perfume is not sprayed on your nose, so why can you smell the pungent fragrance?

2. Why do we often smell the fragrance of flowers or wine near gardens or hotels?

3. Water stored in an open container will gradually decrease at room temperature, but will decrease faster if it is heated. Why is this?

4. Sugar dissolves in water. The sugar disappears, but the water still has a sweet taste?

1. Most substances are composed of molecules

1. Some substances are made of molecules, such as oxygen, hydrogen,

Carbon dioxide, water, alcohol, ammonia, etc.

Example: Oxygen is made up of oxygen molecules;

Carbon dioxide is made up of carbon dioxide molecules;

Water is made up of water molecules;

2. Molecules are one of the particles that make up matter.

2. Properties of molecules

1. The molecule has a small mass and small volume.

A drop of water contains 1.67×1021 water molecules. Guess how many people and how long it takes to count all these water molecules?

Counting by 1 billion people, each person counts 100 per minute, day and night, and it will take 30,000 years to finish counting!

2. Molecules are constantly moving

3. There are gaps between molecules

The volume after mixing 25mL water and 25mL alcohol

From this, you can get what properties the molecule has?

Explain the following phenomena from the perspective of particles

1. You smell a pungent smell when cutting onions

2. Thermal expansion and contraction

3. There are approximately 1.67×1021 water molecules in a drop of water.

4.100ml alcohol and 100ml water are mixed, the volume is less than 200ml

5. The ancients once had a poem praising the chrysanthemum: The fragrance reaches the sky and penetrates Chang'an.

chemical way of thinking

The basic characteristic of chemistry is to study the composition, structure, properties and changes of substances at the molecular and atomic levels;

The connection between macro and micro is the most characteristic way of thinking that distinguishes chemistry from other disciplines.

Provide corresponding microscopic explanations of common physical phenomena:

Changes in the three states of gas, liquid, and solid. Changes in the distance between particles.

Volatilization phenomenon the movement of molecules (or atoms)

Thermal expansion and contraction The movement and spacing of molecules (or atoms) change with temperature

Dissolution Phenomenon Molecular Movement and Space Between Molecules

Hydrogen burns in chlorine to form hydrogen chloride (picture below). Try to analyze the changes of molecules and atoms in chemical changes such as the reaction of hydrogen and chlorine and the decomposition of water. Infer that in chemical changes, is it the molecules or the atoms that change?

In chemical changes it is the molecules, not the atoms, that change. Atoms are the smallest particles involved in chemical changes.

In chemical changes:

decompose, reaggregate, gather into

Molecule → Atom → New Molecule → New Substance

The essence of chemical changes:

In chemical changes, molecules break into atoms and the atoms recombine into new molecules.

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For more information about the PPT courseware "Molecular Particles Composing Matter", please click the "Molecules PPT Particles Composing Matter PPT" tab.

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Update Time: 2024-07-03

This template belongs to Chemistry courseware Beijing Curriculum Reform Edition Ninth Grade Chemistry Volume 1 industry PPT template

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