Ions

Lesson one demonstrates the circumstances under which common materials, such as sugar and table salt, conduct electricity. The process of electrolysis is demonstrated in the making of metallic leaves. In investigating the movement of ions, permanganate ions spread toward the anode side of a liquid chamber when electricity is applied. Lesson two demonstrates the formation of a metallic copper crystal tree, and silver crystals are formed when copper wire is immersed in aqueous sulfur nitrate. Lead iodide is formed by heating a mixture of potassium iodide and lead nitrate solutions. In lesson three, chemical batteries are made of copper, zinc, a grapefruit, and an eggplant. Fuel cells generate pollution-free electricity. (38 minutes, color