Essentials of Chemical Education by Hans-Dieter Barke

By Hans-Dieter Barke

For everyone educating chemistry or turning into a chemistry instructor, the authors supply a practice-oriented evaluation with various examples from present chemical schooling, together with experiments, types and workouts in addition to suitable effects from learn on studying and educating. With their confirmed suggestion, the authors hide classical subject matters of chemical schooling in addition to glossy subject matters resembling every-day-life chemistry, student’s misconceptions, using media or the demanding situations of motivation. this can be the thoroughly revised and up-to-date English version of a hugely winning German title.

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11). 12). 13). Many false conceptions regarding gases are derived from everyday language. 14), strong pressure has to be placed on butane gas with the help of the piston: a drop of liquid butane forms in the presence of gaseous butane. It needs to be clarified that lighters and camping gas cartridges contain liquid and gaseous butane. It is also helpful to 14 1 Learners Ideas and Misconceptions show the big volume of gaseous butane compared with the volume of the liquid: the drop of butane fills the whole pump with gaseous butane.

Wait 1 min. Put some drops into the Erlenmeyer flask with glass beads, attach the gas syringe, shake the Erlenmeyer flask, and observe the moving piston. Observation: The balance shows a decreasing mass until the liquid has evaporated. The gas syringe fills bit by bit until the gas volume is constant. 4. ” One has to show to students that the metals and water react to new substances: on the one hand a gas is formed (hydrogen) and acid–base indicators switch their colors indicating an alkaline reaction.

9. Conservation of Matter by Carbon Combustion Problem: The experiments with iron wool and matches show that combustion products like solid iron oxide or the wooden remnants of the matches remain. ” So it seems very important that the gaseous combustion product carbon dioxide must be shown and weighed to convince students that the law is valid even in this case. 10) will also show that gases have specific densities, that the density of carbon dioxide is higher than that of air. Material: Digital scales, 2 L round bottom flask, balloon, burner, gas syringe with 20 cm glass tube, test tube; small pieces of charcoal, oxygen, lime water.

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