1. States of Matter 7SCIENCE Thurs. April 7

2. Review: Kinetic Theory of Matter What is the kinetic theory of matter? All particles in matter are in constant, random motion What determines state of matter (solid, liquid or gas) ? Arrangement Movement (motion) of atoms

3. Kinetic Theory of Matter These energy produced by these moving particles is called kinetic energy The higher the temperature, the faster the particles are moving and more likely they will collide into other particles When particles collide, the faster-moving particles (hotter) transfer some energy to the slower-moving particles (cooler)

4. States of Matter: SOLID The lower the temperature, the slower the particles are moving (less energy) Solids: The particles have little motion, and are shaking in a specific arrangement/shape

5. States of Matter: Melting/Freezing Points If temperature ↑, the particles will shake faster and at a certain temperature they will break free of their shape This temperature is called the melting point solid  liquid When the opposite happens (liquid  solid) this temperature is called the freezing point

6. States of Matter: LIQUID In a liquid the particles are free to move and take the shape of its container Ex. Pour a glass of water: Forces hold the particles together as a liquid while gravity holds them at the bottom of the glass

7. State of Matter: GAS If temperature in the liquid increases, the particles begin to shake faster and escape the arrangement and forces of the liquid This temperature is called the boiling point and is called vaporization Particles are free to move around inany direction or shape