2. Describing Matter  What you observe when you look at a particular sample of matter is its properties.  Properties used to describe matter can be classified as extensive or intensive.

3. Properties of Matter  Extensive properties  Extensive properties: depend on the amount of matter that is present.  Volume  Mass  Energy Content (Think Calories)  Intensive properties  Intensive properties: (Characteristic Properties): do NOT depend on the amount of matter present.  Melting Point  Boiling Point  Density

4. Different Physical Properties of Matter HeliumSulfur hexafluoride  Density = 0.1786 g/ l  Melting point = -272.20 C  Boiling Point =- 268.93 C  Gas at room temperature  Density =6.17 g/ L  Melting Point =-78C  Boiling Point = -64 C Gas at room temperature http://www.youtube.com/watch?v=52UAEQfMTt U

5. V6 MythBusters Video  V6 MythBusters Video  V7 Sulfur Hexafluoride

6. Physical Properties table 1.What substance(s) is a gas at 0 °C? 2.What substance(s) is a solid at 100°C?

7. Physical Properties table What substances is a solid at -125 ° C?

8. Phase Diagram - gives conditions of temperature & pressure at which a substance exists as solid, liquid and gas.

9. Triple Point - all three phases exist in equilibrium Critical Point - temperature at which the liquid state ceases to exist Supercritical Fluid -

10. Triple Point of Water  0.016° C & 0.61 kPa  Liquid, vapor & solid are all in equilibrium  Vaporization  Condensation  Melting  Freezing  Sublimation  Deposition

11. Melting Point Boiling Point Phase Diagram - H 2 O

12. Why does dry ice sublime when we use it in the lab?

13. Phase Diagram for Carbon

14. Heating Curve

15. States of Matter

16. What is happening at point c?

17. When is a liquid turning into a gas?

18. Why does heat increase at point D but not temperature?

19. What phase is water at 90 degrees celsius and 0.004 atm?

20. If you are at 0.80 atm and you temperature changes from 60 C to 95 C what phase change has happened?