- Halogens – Display flasks containing the halogens chlorine, bromine, and iodine.
- Add a special flask of bromine that can be frozen in liquid nitrogen
- Halogens.pdf
- Polarity and Geometry – Show the dependence of dipole-dipole forces on geometry by contrasting the effect of a charged rod on streams of H2O and “CCl4” (actually hexane) flowing from burets.
- Use pairs of space-filling models of n-pentane and isopentane to show that increased branching increases compactness, decreases polarizability, and decreases London forces
- Pair with velcro models to simulate the strength of IMF between branched and un-branched hydrocarbons
- Viscosity of Liquids – Compare the viscosity of several liquids via the viscosity apparatus – hexane, ethanol, water, and glycerin.
- Dry Ice Sublimation – Make the sublimation of dry ice “visible” by dropping a piece of dry ice in a beaker of water. (Optional: place a piece of dry ice in a glove, tie it off, and allow the dry ice to sublime, inflating the glove.)
- Changes of state – Pour liquid nitrogen into a beaker to demonstrate a variety of phase changes: the boiling of N2(ℓ), the deposition of H2O(g) as H2O(s) on the outside of the beaker, and the melting of H2O(s) to H2O(ℓ) as the beaker eventually warms up again
- Comparing the Vapor Pressure of Two Liquids – Show the effect of intermolecular forces on the vapor pressure of liquids by contrasting the vapor pressures of two isomers, diethyl ether and 1-butanol.
- Boiling Water at Room Temperature – Show water boiling at room temperature in a beaker in an evacuated bell jar, then put your hand in the water after boiling to convince students of its low temperature. (Upon request, we can give you a clean beaker and tap water if you want to drink the boiled water)
- Triple Point of CO2 – Demonstrate the existence of three phases of CO2 at the triple point by adding crushed dry ice to a clear acrylic tube fitted with a pressure gauge and a release valve