What Are The Properties Of Aluminum?

It is a very light metal, with only one third the mass of iron. Aluminum is extremely malleable and strong: it can be drawn into wire or pressed into extremely thin sheets. Aluminum also has strange chemical properties. On the one hand, it seems not to be afraid of oxidation, as we can see from POTS, POTS and other aluminum utensils; But on the other hand, aluminum has a very strong affinity for oxygen. This seems to be a paradox of nature, the great Russian chemist Dmitri Mendeleev pointed out early. The problem is that, as soon as the silvery aluminum is refined, it coats the air with a thin film of dull alumina, which prevents further oxidation. Not every metal has this self-defense capability. Everyone knows, for example, that the oxide of iron, rust, does nothing to protect it from further oxidation: it is so brittle that it is easily penetrated by air and water. The oxide film, on the other hand, is so dense and elastic that it is a reliable protective layer for aluminum.

When aluminum is heated, it violently combines with oxygen and becomes alumina, giving off a great deal of heat at the same time. This property of heat release when aluminum is burned can be technically used to extract that metal from the oxide of another metal by mixing a powder of aluminum metal with that metal oxide. This process is called thermite, in which the metal is reduced by stripping oxygen from the oxides of other metals.

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