| Topic | Chapter-Section | Name of Videodisc Demonstration | Description |
|---|---|---|---|
| Acids and Bases | 12e | Oxidation of Ascorbic Acid | Ascorbic acid (vitamin C) is oxidized with aqueous Fe(CN)63-. |
| Role of ascorbic acid as a natural antioxidant in food. | |||
| Redox reaction | |||
| 13c | Extraction of 2,6- dichlorophenol | Demonstrates use of separatory funnel | |
| Acid/base chemistry | |||
| immiscible liquids | |||
| polar and nonpolar forces | |||
| 15a | Conductivity of Carboxylic Acid | Conductivity of water, glacial acetic acid, and dilute acetic acid compared. | |
| Role of water in ionization of electrolytes | |||
| Neutralization of weak electrolytes acetic acid and aqueous ammonia produces a salt which is a strong electrolyte | |||
| Electrolyte strength of 0.1 M HCl and 0.1 M acetic acid compared. | |||
| 15b | pH of Acetic Acid Derivatives | pH of 0.1 M HCl and 0.1 M acetic acid compared using pH meter and methyl violet indicator | pH of acetic acid, monochlor-, dichloro-, trichloro, and trifluoroacetic acids compared using pH meter and methyl violet indicator |
| 19a | Effect of pH on the Solubility of Casein | A basic solution of the milk protein casein is titrated with HCl. About pH 6, the protein precipitates as its change is neutralized. At lower pH, the protein develops a positive charge and redissolves. | |
| Illustrates the curdling of sour milk. | |||
| Thermal Chemistry | 1a | Combustion of Methane Balloons | Ignition of balloons containing methane and methane + oxygen |
| Density differences | |||
| Stoichiometry | |||
| Balanced equation | |||
| 6c | Addition of Iodine to alpha - Pinene - Relief of Ring Strain | reaction of alpha - pinene (from turpentine) with iodine results in a highly exothermic reaction accompanied by a large purple cloud from sublimation of excess iodine | |
| formerly used to treat infected horses' hooves | |||
| 7a | Preparation and Combustion of Acetylene | Calcium carbide lumps are dropped into a beaker of water. Bubbles of acetylene are produced. Acetylene is ignited to produce a sooty flame. | |
| Equation | |||
| 7b | Spontaneous Combustion of Acetylene in Chlorine | Acetylene produced from reaction of calcium carbide and chlorine water bursts into flame and produces a copious amount of soot | |
| Combustion Reaction | |||
| 11b | Oxidation of Glycerine with Solid Potassium Permanganate | demonstrates effect of particle size on rate of reaction | |
| redox reaction | |||
| exothermic reaction | |||
| 16d | Combustion of Polystyrene and Polyethylene | Samples of polyethylene (milk bottle) and polystyrene (medicine cup) are burned. Polystyrene burns with a smoky flame. Polyethylene burns with a clear flame. | |
| 18a | Dehydration of Sucrose with Sulfuric Acid | sucrose (table sugar) and conc. sulfuric acid react in a highly exothermic manner to form a cylinder of carbon that "grows" out of the beaker | |
| exothermic reaction | |||
| biochemistry | |||
| 18d | Oxidation of Sucrose with Potassium Chlorate | Sucrose bursts into flame when oxidized by potassium chlorate | |
| exothermic reaction |
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