"Molecular Composition of Matter" Heat and Energy PPT Courseware 2

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"Molecular Composition of Matter" Heat and Energy PPT Courseware 2

what is molecule

The smallest particles that retain the original properties of matter are called molecules

*The molecules are very small, about 10-10m in diameter *The number of molecules is huge

How many molecules are there?

Under normal temperature and pressure, 1cm3 of water contains approximately 3.35×1022 water molecules. If these water molecules are evenly distributed on the surface of the earth, more than 5,000 water molecules can be obtained in 1cm3 area!

2. Microscopic models of solid, liquid and gaseous states

Simulation animation of intermolecular distances in three states of matter

General situation: the distance between molecules becomes larger

Comparison of solid, liquid and gaseous states

molecular arrangement

Solid molecules are tightly packed

There is no fixed position, so movement is relatively free.

Extremely scattered, widely spaced, and moving around at high speed

molecular distance

very small

larger than solid

very big

intermolecular forces

very big

Less force than solids

Extremely small and easily compressed

external characteristics

Solids have a certain volume and shape

No definite shape, fluid

Gas is fluid

Most substances decrease in volume when changing from liquid to solid (the exception is water, which increases in size when it freezes), and increase in size when changing from liquid to gas.

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"Molecular Composition of Matter" Heat and Energy PPT Courseware:

"Molecular Composition of Matter" Heat and Energy PPT Courseware Introducing a new lesson 1. What are the basic units that constitute the structure and function of sugarcane? 2. What are the main substances contained in sugarcane juice? Experiment 1: Observing sucrose 1. Use a magnifying glass to observe a square piece of sucrose. You see...

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Update Time: 2024-12-04

This template belongs to Physics courseware Lu Jiao Edition Ninth Grade Physics Volume 2 industry PPT template

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