By W G Frankenberg
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Unterrichtsplaner gingen lange davon aus, dass Schüler kaum eigene Vorstellungen in den Unterricht mitbringen. Fachdidaktische Erhebungen zeigen allerdings, dass Kinder und Jugendliche sehr wohl eigene Ideen zu Natur und Alltag haben. Chemiedidaktiker ermöglichen erfolgreiches Lernen, indem sie diese diagnostizieren.
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Extra info for Advances in Catalysis and Related Subjects, Volume 4
Destroyed practically all activity of the catalyst toward exchange with isobutane at 150°C. 2% D 2 0 produced a remarkable increase in exchange activity. The results of these two investigations show quite conclusively that water promotes silica-alumina in its ability to activate a saturated CHEMICAL CONCEPTS OF CATALYTIC CRACKING 19 hydrocarbon molecule, and that i t is probably not the potential water built into the lattice as hydroxyl groups which is involved. This is t o say that the Lewis type acid centers require activation by water, creating a Bronsted type acid.
Paw 31 35 1. , . . . . . . . . . . . 2. Reduction of Halogens by Hydrogen Peroxide.. . . . . . . . . . . 3. The Steady State . . . . . . . . . . . . . . . . . . . . . . . . 36 37 37 ..................... 43 2. Active Intermediates. . . . . . . . . . . . . . . . . . . . . . . . . 62 VI. Copper Compounds.. . . . . . . . . . . . . . 71 VII. ,. . . . . . . 75 I. INTRODUCTION It is a measure of the complexity and variety of the chemical reactions in which hydrogen peroxide participates that they have attracted the attention of chemical kineticists for almost a hundred years, and that many of the earliest reactions to be investigated still provide matter for further investigations.
BAXENDALE involves only the catalytic decomposition of hydrogen peroxide, then the concentrations in this state will be determined in the general case by equations similar to (a) and (c). Since for halogen Xz, tl[Xz]/dt = 0, we have F has been called "the steady state function" and has been obtained in all cases by measuring the stationary halide and halogen concentrations. According to Eq. (d), in the general case F should be a function of hydrogen ion concentration, but it so happens that over the ranges of acidity convenient for its determination, F for each halogen when corrected for salt effects, is almost constant.