Reaction of nickel with iodine
Powdered nickel and powdered iodine are mixed together. Adding drops of water to the mixture fails to initiate a reaction.
calorimetry/thermochemistry
Reaction of zinc with iodine
Granular zinc and powdered iodine are mixed together. Adding drops of water to the mixture initiates a reaction.
Ammonium dichromate volcano
Ammonium dichromate decomposes to form nitrogen, water vapor, and chromium(III) oxide.
Nitrogen triiodide detonation
Simply touching dry nitrogen triiodide with a feather causes it to explode. Includes slow-motion replay of explosion.