1. Test #3 – Phase Changes Table H and Boiling Point http://www.youtube.com/watch?v=quo-RjT1-fk

2. Normal Boiling Point NBP is the temperature when the Vapor Pressure of the liquid = Standard Pressure Standard Pressure = 101.3 kPa or 1 atm kPa = kilopascals atm = atmosphere

3. Changing Boiling Points Increasing the air pressure on a liquid increases its boiling point and vise versa Examples: Pressure Cookers Inc pressure, inc BP Baking at High Altitudes Dec pressure, dec BP

4. Table H: Vapor Pressure of 4 Liquids 1. Notice axes 2. Note: Increasing temperature increases the vapor pressure 3. Table can be used to predict: NBP at standard pressure (see dotted line) BP at different pressures which liquid has strongest intermolecular attractive forces (it’s the one with the lowest vapor pressure at any temp)

5. Table H – Vapor Pressure of 4 Liquids