What happens to the average kinetic energy of the molecules of a warm substance when the temperature of the substance is slightly decreased? It increases. It decreases. It becomes zero. It remains unchanged

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The closer the atoms are to becoming ionic the more highly dense the negatively charged side gets.

Remember that rust prevented by placing a sacrificial electrode in electrical contact with the iron. the sacrificial electrode must be composed of a metal that  oxidizes  more easily than iron (that is, it must be below iron in table 18.1).

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