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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)



 
                

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Copyright date: ©1997



Part of the Series : Investigations in Chemistry: Experiments and Observations
     


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Acids, Bases, and Neutralization
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In the first lesson, five aqueous solutions are tested for degrees of acidity and alkalinity. The nature of acids and bases is examined. In lesson two, table salt is produced by mixing small pieces of aluminum with solutions of hydrochloric acid and ...(more details)
 
Atoms, Molecules, and Chemical Change
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Lesson one looks at copper atoms using a Scanning Tunnelling Microscope connected to a computer. Several demonstrations of combustion include burning firecrackers under water. Lesson two shows combustion of an industrial diamond. Thermite reaction pr...(more details)
 
Pure Substances and Mixtures
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In lesson one, heat is used to distill ethanol. Iodine distilled from seaweed demonstrates the chemical phenomenon of sublimation. The principle of chromatography is explored by studying color pigments in water-base pens. Lesson two studies salt diss...(more details)
 
Laws of Chemical Change and Heat Flow
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The first lesson provides examples of the Law of Conservation and Mass and the Law of Definite Proportions. Recycling of elements is examined. In lesson two, exothermic and endothermic reactions are demonstrated by an experiment that uses the chemica...(more details)
 
Matter and Change
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In lesson one of this program, experiments are conducted on five white "mystery" powders to determine chemical content and reaction. Salt is fused into a solid block. By feeding gaseous oxygen into a plastic bag of liquid nitrogen, we observe the res...(more details)
 


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