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Over time, hydrogen peroxide (H2O2) decomposes into water (H2O) and pure oxygen (O2) according to the decomposition reaction equation 2H2O2(aq) --> 2H2O(l) + O2(g). The swell in the bottle and the hiss when you open it are the oxygen gas formed.

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9y ago
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15y ago

It is probably similar to the effect of soda has when it opens. When you open it it releases the pressure the carbon dioxide in it. Its something like that I think

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Q: Why does hydrogen peroxide hiss when it is left sealed for a long time and then opened?
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