By Geoff Rayner-Canham et el.
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In 1962, Neil Bartlett, a British chemist, decided to challenge this long-held belief. Working as a professor at the University of British Columbia (UBC) in Vancouver, he assigned his first research student the task of identifying an unknown compound that he, himself, had prepared as a graduate student. The unknown compound proved to be O2PtF6, which is composed of O2ϩ and PtF6Ϫ ions. The interesting thing about this compound was that PtF6 had an electron affinity greater than the ionization energy of the oxygen molecule.
That Is the Question What types of compounds, when dissolved in water, conduct electricity? Materials solutions (distilled water, tap water, table salt in water, baking soda in water, sugar in water, antifreeze in water) conductivity tester spot plate 1. 2. Place a few drops of the solution in labelled depressions of the spot plate. Keeping the probes 1 cm apart, determine the brightness of the bulb using a scale from 0 (bulb did not glow) to 3 (bulb was very bright). Group the solutions based on the degree of brightness.
10). For each ionic compound, it has been found that the cations and anions are packed together in a threedimensional array called a crystal lattice, which has a specific shape. 11 shows the crystal lattice for sodium chloride. The larger, green spheres are the chloride ions, ClϪ, while the smaller, grey spheres are the sodium ions, Naϩ. Why is a cation almost always smaller in radius than an anion? The reason is that the location of the outermost electrons determines the radius of an atom or, in this case, an ion.
Addison Wesley Chemistry 11 by Geoff Rayner-Canham et el.