In yesterday's IGCSE science exams I was given the equation:
C2+O2 ---> CO2
Then it asked me "Does CO2 have more, or less potential energy than oxygen and carbon, or does it have the same amount of potential energy?" or something like that.
I had to say more, less or same and then give an explanation.
Well...they need energy to bond together but the reaction is exothermic so releases energy but then when you want to break the CO2 bonds apart you need even more energy
Does that mean it has less potential energy?