Describes two demonstrations for use in chemistry instruction. The first illustrates the preparation of a less common oxide of iron, showing why this oxide is rare. The second is an explosion reaction of hydrogen and oxygen that is recommended for use as an attention-getting device. (TW)

Describes two demonstrations used in laboratory chemistry courses. Discusses a "pH-activated" display used to chemically and visually supplement lecture demonstrations. Outlines another demonstration designed to show that copper(II) chloride is made of two ions, blue and yellow, which are combined to produce green. (TW)