Lesson: Hess’s Law Chemistry • First Year of Secondary School

In this lesson, we will learn how to define and use Hess’s law to calculate enthalpy changes.

Lesson Plan

Students will be able to

define Hess’s law,
express equivalent energy changes on diagrams representing Hess’s law,
use standard enthalpies of combustion to calculate standard enthalpies of formation,
use standard enthalpies of formation to calculate standard enthalpies of reaction,
use combinations of other standard enthalpies in the creation of Hess’s cycles,
compare enthalpy change answers calculated from standard enthalpy changes to those calculated from bond energies.