Vapor Pressure: H-bonding vs. dipole-dipole attraction
The vapor pressures of butanol and diethyl ether are compared using barometers to show the effect of hydrogen-bonding on vapor pressure.
physical properties
Vapor Pressure: Molecular Polarity
The vapor pressures of chloromethane and dichloromethane are compared using barometers to show the effect of polarity on vapor pressure.
Heat Conduction by Diamond - Part 1 of 2 - With Ice Cube
A synthetic diamond wafer and an aluminum disk are held between a thumb and forefinger (to provide heat). When pressed against an ice cube, the diamond penetrates more rapidly than does the aluminum.
Heat Conduction by Diamond - Part 2 of 2 - With Butter
Butter is used to glue a piece of pasta to each disk. When the edges of the disks are immersed in hot water, the butter on the diamond melts more rapidly, releasing the piece of pasta.
Thermochromism: Mercury(II) Iodide - Temperature Increases
Mercury(II) iodide is heated to convert it from its red low-temperature alpha form to its yellow high-temperature beta form.
Thermochromism: Mercury(II) Iodide - Temperature Decreases
When the beta form of mercury(II) iodide cools to below the transition temperature of 126°C, it returns to the red/orange alpha form.
Memory Metal - Demonstration
When memory metal is bent, it deforms. When placed into hot water, the metal "remembers" its original shape.
Memory Metal - Animation
An animation shows how memory metal can be deformed then go back to its original shape.
Hardness of Solid Substances - Peeling Layers of Molybdenum Disulfide - Animation
An animation illustrates how peeling occurs between layers where bonding is weak in molybdenum disulfide.
Liquefaction of Carbon Dioxide - Part 1 of 4
The liquefaction of carbon dioxide is shown. In Part 1, dry ice is placed in a strong plastic tube and a pressure gauge is attached.