1. Phase Changes Courtesy www.lab-initio.com

2. CA Standards Students know energy is released when a material condenses or freezes and is absorbed when a material evaporates or melts.Students know energy is released when a material condenses or freezes and is absorbed when a material evaporates or melts.

3. Water phase changes Temperature remains __________ during a phase change. constant

4. Effect of Pressure on Boiling Point

5. Phase Diagram  Represents phases as a function of temperature and pressure.  Critical temperature: temperature above which the vapor can not be liquefied.  Critical pressure: pressure required to liquefy AT the critical temperature.  Critical point: critical temperature and pressure (for water, T c = 374°C and 218 atm).

6. Phase changes by Name

7. Water

8. Carbon dioxide Phase Diagram for Carbon dioxide

9. Carbon

10. Phase Diagram for Sulfur