1. Chapter 2 Chemistry Lesson 2 Changes of State Essential Questions: 1.) What happens to particles of a solid as it melts? 2.) What happens to particles of a liquid as it vaporizes? 3.) What happens to particles of a solid as it sublimes?

2. Particles In A Liquid, Solid and Gas Animation http://www.harcourtschool.com/activity/states_of_matter/

3. The change from a solidMelting to a liquid Particles in a solid Energy is added. The particles vibrate faster and break from their fixed position. Particles in a liquid

4. The change from a liquidFreezing to a solid Particles in a liquid The water loses energy. The particles move so slowly they take on a fixed position. Particles in a solid

5. The change from a liquid Vaporization to a gas Particles in a liquid The particles gain enough energy to move independently. Particles in a gas

6. Takes place Evaporation only on the surface of a liquid Takes place Boiling below and at the surface of a liquid

7. The change from a gas Condensation to a liquid Particles in a gas The particles lose energy. Particles in a liquid

8. The surface particles Sublimation of a solid gain energy and form a gas Surface particles in a solid Particles in a gas Gain enough energy