Vapor Pressure: Molecular Size - Pentane, Hexane and Heptane
The vapor pressures of pentane, hexane and heptane are compared using barometers to show the effect of molecular size on vapor pressure.
gases
Vapor Pressure of a Mixture: Raoult's Law
Raoult's Law, which describes the vapor pressure of a mixture, is demonstrated using barometers.
Vapor Pressure of a Mixture: Raoult's Law - Example 2
Another mixture of decane and diethyl ether is used to demonstrate Raoult's Law. Students are asked to predict the vapor pressure of the mixture.
Vapor Pressure of a Mixture: Raoult's Law - Example 2 Ending
Another mixture of decane and diethyl ether is used to demonstrate Raoult's Law. Students are asked to predict the vapor pressure of the mixture, and the answer is shown.
Boiling by Cooling - Demonstration
Water in a sealed flask is made to boil below its normal boiling point by cooling the water vapor in the flask.
Boiling by Cooling - Counter Example
Cooling the liquid does not cause the water to boil.
Rising balloons
Balloons filled with gases less dense than air will rise.
Falling balloons
Balloons filled with gases more dense than air will fall.
Fluidity of carbon dioxide gas
Carbon dioxide gas is poured down a covered trough with candles inside.
Fluidity of methane gas
Methane gas from a beaker flows up a covered trough to a candle flame.