Third, upholstery foam produces deadly gases when it burns. Ignited polyfoam sofas can reach temperatures over 1400 degrees Fahrenheit within minutes. Studies show that PU foam releases significantly higher amounts of hydrogen cyanide at a faster rate than cotton, wool, and nylon (source and source...
This refers to a "blow-by-blow" description of what happens when the atoms in the reacting species re-arrange themselves into the configurations they have in the products. [image link] Mechanisms, unlike energetics, cannot be predicted from information about the reactants and products; ...
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