What type of energy is released when a firecracker explodes

There is heat, light and sound energy, that is released.

- - Sound energy. That's how you hear it explode.

- - Light energy. That's how you see it in the sky.

- - Heat energy. That's why you get burned if sparks fall on you.

- - Potential energy, as all the pieces fall to the ground.

These were all stored in it as chemical energy before it exploded.