What happens to burned up hydrogen?

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Antymattar
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What happens when hydrogen is burned up? Does it disappear? An element is defined as something that can not, in any way, be changed by a chemical reaction. But fire is a chemical reaction. What happens when hydrogen catches fire?
 
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For something to burn you need Oxygen.

So the reaction is Hydrogen plus Oxygen: 2H + O = H2O (The equation is along those lines, may be a bit more to it.)

The resultant product is water, H20.