SDN Members don't see this ad. (About Ads) When ATP is hydrolyzed to ADP + Pi, is this an endothermic/ exothermic reaction? Also, is it exergonic/ energonic? I saw a destroyer problem that stated that hydrolysis of ATP is exergonic. But breaking a bond requires energy, so would that mean ATP hydrolysis is endothermic AND exergonic??? Please help, thanks!