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<br />. <br /> <br />constituents of the water molecule. Chalkboard models and <br /> <br />computer generated models (HyperChem) were used to support <br /> <br />student understanding of the water molecule. <br /> <br />2. Next the Hoffman apparatus was used to demonstrate the <br /> <br />electrochemical properties of water. The water molecules <br /> <br />(H20) were separated into the diatomic gases of O2 and H2. <br /> <br />The hydrogen gas generated was used to fill an egg shell for <br /> <br />. <br /> <br />a demonstration of an "egg's'plosion". The oxygen gas <br /> <br />generated was used to demonstrate burning in a pure oxygen <br /> <br />atmosphere. The demonstration also showed the constituents <br /> <br />of water to be indestructible by ordinary (chemical) means, <br /> <br />that low energy levels (car battery) could cause <br /> <br />disassociation of the water molecule, that it took energy to <br /> <br />break up the molecule, and that the constituents of water <br /> <br />could be "burned" to release energy with the product of <br /> <br />combustion being water. The possible social benefits of <br /> <br />using hydrogen and oxygen as an alternative motor vehicle <br /> <br />fuel were presented to the students. Special emphasis was <br /> <br />placed on the finite quantity of hydrogen, oxygen, and water <br /> <br />on earth. <br /> <br />. <br /> <br />11 <br />