I think when potassium metal is put into a hydrogen peroxide solution is more dangerous than puting in HCl, right? The energy released more? Or just the energy released within a period of time is high?

it depends on the concentrations of hydrogen peroxide and hydrogen chloride

 

i'll get back to you later with specific calculations of heat changes, but i have a biology lab that should take 10 hours of time. a friend of mine started it yesterday and in five hours only finished half of it.

That's kind of like saying "What's more dangerous; a nuclear bomb or a thermonuclear bomb?" hehe. They are both incredibly dangerous as the potassium will be reacting with the water in the solution, and the peroxide or HCl. I would just guess that the peroxide would be far more dangerous because the potassium would break down the water quite violently, producing hydrogen gas. At the same time, it would break down the hydrogen peroxide making more water and oxygen gas. The presence of oxygen and hydrogen at an elevated temperature would equal an incredible explosion.