1. The States of Matter A screencast.

2. Preview questions What are the three states of matter? Write down an example of matter changing from one state to another. What caused this change?

3. Kinetic theory States of matter are physically different. Solids have shape and volume. Liquids change shape, not volume. Gases are free to spread in all directions. Solid Gas Gas Liquid

4. The role of energy Thermal energy is the kinetic energy of a substances atoms. Higher temp-particles move faster. Lower temp-particles move slower. Energy is the capacity to do work (change or move matter).

5. Measure of average kinetic energy. More kinetic energy (atoms moving) the higher temperature. Temperature Phase change graph

6. Energy and changes of state Evaporation-liquid to gas. Condensation-gas to a liquid. Freezing-liquid to a solid. Melting-solid to a liquid.

7. Conservation of mass and energy Mass cannot be created or destroyed. Think of a burning match… List the products of this reaction Total mass of the match and oxygen=to the products (ash, smoke, and gases) Energy cannot be created or destroyed

8. Preview Questions, reflection The three states of matter are: –Solid –Liquid –Gas

9. Preview Questions, reflection Ice to liquid water melting. Liquid water to Ice freezing. Liquid water to gas evaporation. Gas to liquid condensation. Examples