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They realized that the known reversible reaction 2BaO (s) + O2 (g) ↔ 2BaO2 (s) was deactivated by the formation of barium carbonate from carbon dioxide in the air; treating air to remove the carbon …

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O2 (brand), a global brand name owned by the Spanish telecommunications company Telefónica O2 Store, a chain of retail stores owned and operated by Telefónica Europe, with regional subsidiaries:

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O2 is the chemical formula for oxygen, which is also known as dioxygen. Because oxygen normally joins with another oxygen by establishing a covalent bond, this formula is given.

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Oxygen (O2) is reduced by both enzymatic and nonenzymatic processes to the superoxide radical (O2-). This radical species of oxygen is postulated to be formed in vivo in animals through activity of some …

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