H2O2 à 20 volumes et poudre de permanganate de potassium. This reaction is an oxydation of H2O2 by MnO4- AND a dismutation of H2O2 because of the heat... This reaction produce oxygen AND steam ( because it's exothermic ) BUT, we can't see oxygen, it's a gas, it's invisible. Steam is a gas too, BUT condensing steam produce a visible "fog"...
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