Lesson Plan: Bond Energy Chemistry • First Year of Secondary School
This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to describe bond energies and use net changes in bond energy during reactions to calculate the bond energies of reactants and products.
Objectives
Students will be able to
- define bond energy and state the units such values are given in,
- identify that the standard value of a bond strength is given per mole of bonds and not per bond,
- calculate the enthalpy of a reaction from given bond energies or vice versa,
- identify the relationship between bond energy and bond strength and the general trend in energies of single, double, and triple bonds,
- understand that bond making is exothermic and bond breaking is endothermic,
- understand that the overall heat change in a reaction depends upon the heat released from bond making versus the heat required for bond breaking,
- realize that many chemical reactions generally involve the breaking of chemical bonds, but the amount of energy needed can vary,
- identify the points at which bonds are broken and made on a reaction profile diagram.
Prerequisites
Students should already be familiar with
- units of energy,
- exothermic and endothermic reactions.
Exclusions
Students will not cover
- concepts of bonding using atomic/molecular orbitals,
- Hess’s cycle,
- heats of reaction.
