1.
Big Ideas about Phase Change

2.
Phase changes happen... <ul><ul><li>Between the three states of matter: </li></ul></ul><ul><ul><ul><li>Solid, Liquid and Gas </li></ul></ul></ul><ul><ul><li>4 Types of Phase Changes: </li></ul></ul><ul><ul><ul><li>Melting </li></ul></ul></ul><ul><ul><ul><li>Freezing </li></ul></ul></ul><ul><ul><ul><li>Evaporation </li></ul></ul></ul><ul><ul><ul><li>Condensation </li></ul></ul></ul>

3.
The key to starting a phase change.... <ul><ul><li>HEAT! </li></ul></ul><ul><ul><li>More Heat = More Kinetic Energy </li></ul></ul><ul><ul><li>More Kinetic Energy = More Particle Movement </li></ul></ul>

4.
Particles and Kinetic Energy <ul><li>When particles have more kinetic energy: </li></ul><ul><ul><li>more speed </li></ul></ul><ul><ul><li>hit other particles harder </li></ul></ul><ul><ul><li>hit other particles more often </li></ul></ul><ul><ul><li>Expand </li></ul></ul><ul><li>When particles have less kinetic energy: </li></ul><ul><ul><li> less speed </li></ul></ul><ul><ul><li>hit other particles less and not as hard </li></ul></ul><ul><ul><li>Contract </li></ul></ul>

5.
Let's Compare Phase Changes <ul><li>Melting - Solid to a Liquid </li></ul><ul><ul><li>Caused by heat </li></ul></ul><ul><ul><li>heat = kinetic energy </li></ul></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li>Evaporation- Liquid to a Gas </li></ul><ul><ul><li>Caused by heat </li></ul></ul><ul><ul><li>Heat = kinetic energy </li></ul></ul><ul><li>Condensation - </li></ul><ul><li>Liquid to a Gas </li></ul><ul><ul><li>Caused by cooling </li></ul></ul><ul><ul><li>Particles slow down & contract </li></ul></ul><ul><li> </li></ul><ul><li>Freezing - Liquid to a Solid </li></ul><ul><ul><li>Caused by cooling </li></ul></ul><ul><ul><li>Particles slow down & contract </li></ul></ul>

6.
Melting & Evaporation Caused by heat---

7.
Condensation & Freezing Caused by cooling & contracting