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Hydrogen Peroxide H2O2 is chemically unstable, and exposure to a catalyst will cause it to convert into Oxygen Gas and Water. The bubbles are Oxygen Gas.

The equation that describes this change is

2H2O2 ---> O2 + 2H2O

Even light, heat or age can trigger this decomposition reaction.

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13y ago
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Q: Why does hydrogen peroxide bubbled?
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