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If hydrogen and oxygen are gases, then how is H2O liquid?

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Hydrogen and oxygen are gases but water is a liquid because water is generally formed when hydrogen is combusted (burnt) in the presence of oxygen. read more

In this oxidation, a molecule of hydrogen gas is ionized to two electrons and two protons. Writing a half-reaction for oxygen reduction is more complicated, since oxygen can be reduced by either one, two or four electrons, as shown by the square redox scheme to the right, below. read more

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