Heat, Energy and now Enthalpy? What is going on? Our episode starts by defining and distinguishing between these concepts (0:54) before taking a closer look at enthalpy itself. The episode connects the mathematical sign of enthalpy to the heat being absorbed / released (1:39) and discusses the extensive character of enthalpy (2:06) as well the value of reversed reactions (2:23) and its dependency on the state (2:47). We also recap two approaches to calculate the enthalpy of a reaction: taking into account the bonds broken and bonds formed (3:06) as well as the standard enthalpies of formation (5:25). To clarify the calculations using the standard enthalpies of formation, we discuss the combustion of propane (7:10).Question (9:20): What is the law called that allows us to use the sum of enthalpy changes, independent of the steps?Thank you for listening to The APsolute RecAP: Chemistry Edition!(AP is a registered trademark of the College Board and is not affiliated with The APsolute RecAP. Copyright 2021 - The APsolute RecAP, LLC. All rights reserved.)Website:www.theapsoluterecap.comEMAIL:TheAPsoluteRecAP@gmail.comFollow Us:INSTAGRAMTWITTERFACEBOOKYOUTUBE