Kinetic Theory of matter

KINETIC MODEL OF MATTER

​By end of the lesson, you can

•describe the molecular structure of solids, liquids and gases;

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•describe how the motion of particles is affected by temperature.

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SOLIDS

​2. Motion

Particles vibrate about fixed positions.

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​1.Arrangement

Particles are closely packed together.

-High Density​

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​3.They are held in place by very strong attractive forces

​​-fixed volumes and shapes.

Open Ended

WHY DO SOLIDS HAVE A FIXED VOLUME AND SHAPE?

LIQUIDS

​1.Arrangement - Particles are slightly farther apart as compared to solids, and randomly arranged.

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​2.Motion- Particles are free to move about within the liquid.

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3.There are attractive forces between the particles.

​(Fixed ..................... but no fixed ......................................)

Open Ended

Liquids have fixed volumes and no fixed shapes means

​1.Arrangement -

Particles are very far apart, and randomly arranged. (LOW DENSITY)

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​2.Motion - Particles are free to move about at high speeds.

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3. NO FIXED VOLUME AND SHAPE : The attractive forces between the particles are very weak.

What happens to the motion of the particles when the temperature is changed?

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Regarding ..........................................Temperature increase or decrease

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Affecting speed of particles ............ Kinetic energy increase or decrease

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​Motion of particles.........................

air /liquid particles move faster or slower and will change direction

solid particles vibrate about its fixed position

​Summarize

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1 Arrangement

2 Motion

3 Fixed /No fixed volume or shape

4 Temperature affecting motion of particles ​