CHEM 101 Lecture Notes - Lecture 24: Bond-Dissociation Energy, Trigonal Bipyramidal Molecular Geometry, Endothermic Process

• School: University of Victoria
• Department: Chemistry
• Course: CHEM 101
• Professor: Neil Burford

Document Summary

The energy lost or gained in any chemical reaction. If h reaction is negative, energy was released (exothermic reaction) If h reaction is positive, energy was absorbed (endothermic reaction) The heat of reaction can be estimated using bond dissociation energies. H reaction = (enthalpies of bonds broken) - (enthalpies of bonds formed) Chem 101-lecture 24-bond dissociation energy and expanded octets. The energy required in order to break a bond. Bond dissociation energy is always a positive number, as the breaking of chemical bonds is endothermic (energy is absorbed) Bond dissociation energies for common bonds are given on the data sheet. Add up all the energy which was absorbed by breaking bonds, and then subtract the energy which was released by forming bonds, to determine the net energy loss or gain. Graphs of the change in energy over the course of a reaction https://courses. lumenlearning. com/introchem/chapter/exothermic-and-endothermic-processes/