I somehow doubt it, unless either the chemical reaction PRODUCE arsenic or arsenic is already contained in the gunpowder.
Burning powder
When it burns, as hot as a burning match.
700 yrs give or take
A portion of the gas generated by the burning gun powder is used to operate the action.
Depending on the weight of the gun. The 7mm magnum uses a slow burning powder and also uses a lot of powder creating a higher barrel pressure which gives the gun the kick. A heavier gun will kick less than a lighter gun of the same caliber.
Gas from burning gun powder is used to extact, eject and load the next round into the chamber.
Black Powder.
Gun powder is always a mixture.
gun powder was udes for fireworks, then weapons
Gun Powder is the most important thing in a war because if you don't have gun powder you wouldn't stand a chance.
That portion of the firearm through which the projectile is propelled by the burning of the powder charge. Unless a smoothbore, it also imparts spin on the projectile to stabilize it.
Gun powder is a powder.