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Topic: Science
Number of pages / Number of words: 3 / 763
Essay's paper body

It

comprises 99.76 percent of ordinary oxygen and was used in determination of

atomic weights until the 1960s.

Oxygen is prepared in the laboratory from salts such as potassium

chlorate, barium peroxide, and sodium peroxide. The most important industrial

methods for the preparation of oxygen are the electrolysis of water and the

fractional distillation of liquid air...


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In the latter method, air is liquefied

and allowed to evaporate. The nitrogen in the liquid air is more volatile and

boils off first, leaving the oxygen. Oxygen is stored and shipped in either

liquid or gaseous form.

Oxygen is a component of many organic and inorganic compounds. It forms

compounds called oxides with almost all the elements, including some of the

noble gases...


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