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A salt, by definition, is the molecular bonding of a metal or meteloid to a nonmetal. Ie, sodium chloride, potassium chlorate, etc
Potassium nitrate isnt inherintly explosive. In fact, its sold in bulk at hardware stores under the name "stump remover"
Be proud of your nerdyness. It means youve been at least somewhat properly educated
Rocket fuel doesnt explode if used properly. It combusts, much like the gasoline or diesel fuel in your engine. But instead of pushing a piston head, it applies the thrust directly out its jet