Magnesium + Hydrochloric acid reaction help :D?

The chemical reaction between Mg and HCl is called an exothermic reaction - this means it gives out heat. Consider (in a simple way) that the Mg ribbon is the fuel for the chemical "fire" that gives out the heat. Like all fires, the more fuel you add, the more heat you get out. So the more magnesium, the hotter the solution gets.