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ChemDemos II is a laser videodisc that includes 39 demonstrations suitable for use in introductory chemistry classes either at the high school or college level. As in the original ChemDemos Videodisc the emphasis is on the chemistry, with most demos shown close up, full screen. In only a few cases, where scale is important, can more than the demonstrators' hands be seen. Each demo has been selected because it illustrates an important aspect of chemistry, involves substances or equipment that are not available in many schools, and/or is hazardous or causes problems of disposal or cleanup. Some demos are brand new and not yet published; others are old standards, sometimes with a new twist. All are certain to stimulate students' curiosity and help them learn.

ChemDemos video is now included in the Chemistry Comes Alive! collection of CD-ROMs.

The reaction of sodium metal and chlorine gas to produce sodium chloride is initiated by the addition of a drop of water. Click play to view QuickTime video. (550 KB)

John W. Moore, Jerrold J. Jacobsen, and Kelly Houston Jetzer
University of Wisconsin-Madison, Madison, WI 53706-1396

George Gilbert
Denison University, Granville, OH 43023

Fred Mattes
Hastings College, Hastings, NE 68902-0269

David Phillips
Wabash College, Crawfordsville, IN 47933

George Lisensky
Beloit College, Beloit, WI 53511

Gerald Zweerink
Missouri Western State College, Saint Joseph, MO 64507

Gases and Liquids

• Fluidity of Gases
• Effusion of Gases
• Gas Volume
• Boiling by Cooling
• Critical Point of Benzene
• Viscosity of Liquids

Solid State

• Simulation of Dislocations in Metals
• Heat Treatment of a Metal Bobby Pin
• Heat Conduction by Diamond
• Hardness of Solid Substances
• Piezoelectric Effect
• Superconductivity
• Paramagnetism: Oxidation States of Manganese
• Curie Point of Nickel
• Ferromagnetic Fluid
• Thermochromism: Mercury(II) Iodide
• Memory Metal

Rates of Reactions

• Thermodynamic vs. Kinetic Control: Forming HgI₂
• Temperature and Reaction Rate
• Visible Intermediate: Tartrate + Peroxide
• Autocatalysis: Permanganate + Oxalate
• Iodine Clock Reaction
• Oscillating Reaction: Briggs-Rauscher
• Oscillating Reaction: Belousov-Zhabotinskii

Electrochemistry

• Pulsating Electrochemical Reaction: Hg Beating Heart
• Oxidation States of Vanadium
• Halogen/Halide Redox
• Electrochemical Series: Metal Trees
• Overvoltage
• Metal/Iodine Reaction and Cells
• Simulated Lead Storage Battery
• Electrolysis of Water
• Electrolysis of Aqueous Solutions
• Cathode Ray Tubes
• Conductimetric Titration

Chemical Properties

• Chemical Properties of Sulfur Dioxide
• Relative Reactivity of Alkali Metals
• Sodium + Chlorine
• Potassium + Bromine