I am doing a little independent research, and I am having a hard time finding an answer to this question. I want to know what some of the reactions are that absorb the most heat possible from their surroundings. I can find lists of exothermic reactions pretty easily, but for some reason it is tough to find the endothermic ones. If possible I would prefer to know the reactants, with the amount of energy absorbed. I would much appreciate any help I could get on finding this information.