Animated video: 37 principles of chemical reactions and their dangers---Fire balls

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Principle: The solids and liquids in the two petri dishes on the right are potassium permanganate and concentrated sulfuric acid, respectively. Here, concentrated sulfuric acid exhibits its \"dehydrating property\"; it reacts with solid potassium permanganate to produce manganese heptoxide (permanganic anhydride). Manganese heptoxide is an unstable strong oxide; when it comes into contact with cotton, it can react with it and cause combustion. Fun fact: Historically, sulfuric acid was also used to light matches. The first match in the modern sense was invented in 1805 by Jean Chancel; it contained substances such as potassium chlorate, sulfur, and sugar, and to use it, it had to be dipped into a small bottle containing sulfuric acid to initiate the reaction. Hazard: Medium to high. Concentrated sulfuric acid requires careful handling; proper protection measures must be taken, and it should be kept away from flammable materials. The operation must take place in a well-ventilated area. Permanganic anhydride is corrosive, highly oxidizing, and explosive; safety goggles or a face shield should be worn during experiments, and only small amounts should be mixed. Do not increase the amount of reactants on your own or use other organic substances in the reaction, as it may become too vigorous. Recorder: Royal Chemistry Society