| Category | Format | Size |
|---|---|---|
| Lu Jiao Edition Ninth Grade Physics Volume 2 | pptx | 6 MB |
"Molecular Composition of Matter" Heat and Energy PPT Courseware 2
Description
"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: 2024-07-07
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