yes
"firework powder" is usually gun powder or blackpowder... So yes both of these options can be used in cannons, but don't mix blackpowder with gun powder since they burn at different rates.
Black Powder.
Gun powder is always a mixture.
Gun powder is white and it is flammable there is your answer !!
I am going to punt here, "How far does gun powder go when you shoot a gun"? It will leave the bore and go about 2-3(perhaps more depending on burn rate and size of powder) feet before dissipating completely. Close range (contact and 2-3 feet) gun shots often result in powder burns around the penetrating point. It is commonly used to gauge the distance from muzzle to point of impact for forensic purposes.
gun powder was udes for fireworks, then weapons
Gunpowder- both the original black powder, and today's smokeless powder, is a combination of a fuel and an oxidizer to make that fuel burn. It must have both to work. One without the other is useless.
Gun Powder is the most important thing in a war because if you don't have gun powder you wouldn't stand a chance.
Because China invented gun powder.
Saltpetre+sulphurSaltpeter + sulfer = Gun powder
KNO3 (potassium nitrate) is used in gun powder as an oxidizing agent. When gun powder is ignited in a confined space, it rapidly decomposes to release gases that build pressure, propelling a projectile like a bullet out of a firearm. Potassium nitrate supplies oxygen for this reaction to occur.
you go to the viking mountain and use the gun powder