This song describes the difference between exothermic and endothermic potential energy diagrams. All music and lyrics copyright 2007 by Mark Rosengarten. All rights reserved. Lyrics: Map it, graph it show me how Reaction PE change Exo, endo, whats the diff? Whys it look so strange? Reaction coordinate on the X PE on the Y Time to draw a PE graph Or at least to try! Heat of reactants where we start The left side, on the nose Activation energy Is what we need to go! Activate your reactants, yeah Take it to the top The activated complex Is too hot to stop! The activated complex Breaks up at the end It will form your products Look how that line bends! Map it, graph it show me how Reaction PE change Exo, endo, whats the diff? Whys it look so strange? (Exothermicnegative delta H) If you start reactants high End with products low Its an exothermic change Say it once more, slow! (Exothermicnegative delta Hnegative delta H) EX-OH-THERM-IC CHANGE! ITS NOT STRANGE! (I think the guy who wrote this song is deranged!) If you start reactants low Products higher still Its an endothermic change That means it is a-chill! (Endothermicpositive delta H) EN-DO-THERM-IC CHANGE! ITS NOT STRANGE! (North Dakota has a town called Home On The Range!) Map it, graph it show me how These diagrams bring me joy I dont ever want to end this song