G450: Prep Notes
Introduction
Balloons filled with H2, He, and O2 are shown immediately after being inflated and then again in the following lecture. Differing rates of effusion can be seen.
Rate of effusion for gas 1: rate of effusion for gas 2 = √M2/√M1
(M = molecular or atomic weight)
Supplies
Short List
- Balloons
- String
- Ring stand
Chemicals
- H2, He, and O2
Prior to Lecture (prep time ~ ? min.)
- Inflate three balloons to the same size with H2, He and O2. Tie to a ring stand to make transport easier.
To Conduct Demonstration
- Show H2, He, and O2 balloons inflated to the same size.
- Let them sit undisturbed until the next lecture. Show again. Gases effuse out of the balloons according to the size of the gas molecule.
Reaction Time: ?