In this video, I explain the concept of an enthalpy change, and go through every enthalpy change definition that you will need to know. Looking for a shorter video that quickly goes through the definitions of the enthalpy changes? Here's what you're looking for: The EASIEST method for solving Hess cycles: The EASIEST method for solving Born-Haber cycles: Timestamps: 0:00 - Introduction 0:11 - What is an enthalpy change? 0:32 - What is a standard enthalpy change? 1:26 - What is a standard state? 1:46 - Endothermic vs. exothermic 2:35 - What causes the change in heat energy? 4:30 - Mean bond enthalpy 6:11 - Enthalpy of reaction 7:34 - Enthalpy of formation 8:39 - Enthalpy of combustion 9:45 - Enthalpy of neutralisation 10:38 - First ionisation energy 11:07 - Second ionisation energy 11:44 - First electron affinity 12:14 - Second electron affinity 12:45 - Enthalpy of fusion 13:10 - Enthalpy of vaporisation 13:35 - Enthalpy of sublimation 14:05 - Enthalpy of transition 14:21 - Enthalpy of solution 15:28 - Hydration enthalpy 16:01 - Enthalpy of atomisation 18:34 - Lattice formation enthalpy 18:59 - Lattice dissociation enthalpy -------------------------------- ** If you find my videos helpful, and would like to provide me with caffeine to make more videos, I’d really appreciate it: ** You can also check out my store: Thanks for your support! -------------------------------- #chemistry #alevel #physicalchemistry #education