The Steaming Gun
In a dark bottle at room temperature, hydrogen peroxide decomposes very, very slowly. But add manganese dioxide, and that same reaction happens thousands of times faster, with very… tall results.
Teaching Notes:
Chemical Transformation I: Decomposition with H2O2 with MnO2 (PDF)
Chemical Transformation II: Decomposition with H2O2 with KI (PDF)
Chemistry Magician: Dr. John Dolhun
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