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541.37-548
EDUCATIONAL FILM GUIDE
COLLOI DS — <:!ontinued
llQuld). Failure to settle is explained by Brownian movements, protective films, and chargres on particles. The Cottrell process of smoke precipitation concludes the presentation
54 1 .37 Electrochemistry
ELECTROCHEMISTRY, EBF 1937 llmin sd (Chemistry ser) $45, rent $2.50 541.37
Jh-sh-c Guide
Collaborators: Hermann I. Schlessinger and Warren C. Johnson, University of Chicago
The abstract concepts of electrochemistry are made clear by cinematic techniques. The electrolytic decomposition of hydrogen chloride is followed by the production of electric current from the action of chlorine and hydrogen on platinum. An explanation of the storage battery Integrates both processes. Electroplating illustrates participation of electrodes; electrorefining illustrates preferential discharge; and electrolysis of sodium chloride to yield caustic soda illustrates participation of the solvent. The production of aluminum from a molten electrolyte concludes the subject
542 Experimental chemistry
OXIDATION AND REDUCTION. EBF 1932 llmin sd (Chemistry ser) $45, rent $2.50
542 Jh-sh-c Guide
By Dr Hermann I. Schlessinger and D. Harvey B. Lemon of the University of Chicago
The simultaneous process of oxidation and reduction is presented first by burning phosphorus and rusting iron under experimental conditions. Mercury rust is then decomposed to discover the component of air responsible for oxidation. Other examples of oxidation and oxidizing agents follow. The process of reduction is presented in the operation of the blast furnace, magnesium burning in dry ice, and thermite welding. Everyday examples of oxidation and reduction conclude the picture
546 Inorganic chemistry
CARBON AND ITS COMPOUNDS. Coronet 1949 lOmin sd $45; also color $90 546
sh-c-tr-ad Guide
Collaborator: Therald Moeller, associate professor of chemistry, University of Illinois
A diamond ... a pencil . . . and a chunk of charcoal. Beginning with these familiar objects, this film explains carbon's simple compounds and introduces hydrocarbons and the more complex chain and ring compounds. It teaches appreciation and understanding of the tremendous importance of carbon in our domestic and industrial worlds
THE HALOGENS. Coronet 1947 lOmin sd $45; also color $90 546
jh-sh-c Guide
Collaborator: Dr Therald Moeller, University of Illinois
Combines laboratory demonstration and lecture techniques to present the members of this important group and their properties, free and in tlieir compounds
OXYGEN. Coronet 1947 lOmin sd $45; also color $90 546
Jh-sh-c-ad Guide
Collaborator: Dr Therald Moeller, University of Illinois
Introduces students to this Important element thru dramatic experiments. The need for oxygen in the support of life and in combustion and the part oxygen plays in electrolysis and in oxidation reactions are shown
ROMANCE OF RADIUM. TFC lOmin sd (Pete Smith specialties) apply 546
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Produced by Metro-Goldwyn-Mayer "This is the story of the discovery of radium. . . Highly recommended for college courses in public health. Recommended for general science courses, grrades 6 through high school. The achievement of Mme. Curie might interest girls' vocational groups. The commentary tends to overemphasize the curative powers of radium." Advisory committee
543 Chemical analysis
FLUE GAS ANALYSIS (ORSAT APPARATUS). Castle 1945 19min sd $30.74 543
sh-tr-ad Guide Produced by the U.S. Office of Education Setting up the Orsat gas analyzer; drawing in an air-free sample of flue gas; absorbing and measuring the amounts of carbon dioxide, oxygen, and carbon monoxide In the sample; and how to calculate the amount of nitrogen
PROPERTIES OF WATER. Coronet 1941 ♦ lOmin sd $45; also color $90 543
Jh-sh-c-tr Guide
Collaborators: E. C. Waggoner, Illinois state Audio-Visual Dept. and Gilbert I. Renner, Elgin (Illinois) Public Schools
Shows some of the chemical and physical properties of water by means of experiments and demonstrations. Composition of water is shown by electrolysis. Boiling under various
firessures is shown. Solubility of solids, iquids and gases in water is demonstrated by several experiments. Saturated solutions, crystallization and super-saturation are also demonstrated. Energy changes of water to ice and to steam are shown; also water as a standard of weight and heat and volume
"An excellent film for use in general science and chemistry classes at the junior high, senior high and college levels. Content is accurate, organization is good, and the various experiments are clearly pictured. Photography and sound are well above the average. '• Don White in Ed. screen
548 Crystallography
CRYSTAL CLEAR. AT&T 1948 lOmin sd color loan 543
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Tells the story of man made crystals which are so vital in the telephone industry. The narrator relates that nature takes thousands of years to grow the rare type of quartz needed for electronic crystals; but now they can be made in a short time by special processes. The growtli of the crystals is shown step by step, beginning with the seeds to final large crystal clear bars
CRYSTAL GAZERS. GE 1946 lOmin sd (Excursions in science no. 7) loan 548
Jh-sh-ad This film is a presentation of crystals, their characteristics, and some of their uses, and shows how crystal structure can be used in identifying materials
CRYSTALLIZATION. Bray 20min si $45, rent $2 548
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Part one reveals by means of the microscope the artistry of nature's creation of crystals in the form of icicles and snow flakes. Many of nature's imperishable crystals are also shown, such as quartz, amethyst, and salt, and some from the metals
Part two shows by experiments under the microscope how crystals are formed, their peculiarities of growth, and determining factors in shape
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