1. The Particle Theory of Matter

2. Review From last class…
Did you…?
Finish the Physical Transformations Worksheet?
Put your name on it?
Put it in the pass in bin?

3. Review from last class…
What happens to the molecules when you apply energy (heat)?
What happens to the molecules when you remove energy (heat)?
What is it called when you go from a solidliquid?
What is it called when you go from a liquidgas?
What is it called when you go from a gasliquid?
What is it called when you go from a liquidsolid?
What is it called when you go from a solidgas?
What is it called when you go from a gassolid?

4. Theory vs Model
A theory is a set of statements which are developed to explain several related observations
A model is used as a guide for the imagination when using a theory

5. Particle Theory of Matter
All matter is made up of particles.

6. Particle Theory of Matter*
Particles are always moving.

7. Particle Theory of Matter*
The spaces between particles are larger compared to the size of the particles themselves.

8. Particle Theory of Matter
All particles of the same substance are made of the same particles regardless of state (solid, liquid or gas)

9. Particle Theory of Matter
Particles are attracted to each other. The closer the particles are the stronger the attraction.

10. Particle Theory of Matter*
Particles move faster when heated and slower when cooled down