Lesson Plan: Units of Energy Chemistry

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to express energy in different units and convert between them.


Students will be able to

  • identify the SI unit for energy as the joule (J) and for enthalpy as the kilojoule per mole (kJ/mol),
  • convert singular bond energies into molar bond energies,
  • convert between joules (J), kilojoules (kJ), and kilojoules per mole (kJ/mol),
  • convert between joules (J) and calories (cal) using the conversion factor 4.184 J (4.2 J) = 1 cal.


Students should already be familiar with

  • using moles and the Avogadro constant,
  • the prefix kilo.


Students will not cover

  • detailed descriptions of energy changes during chemical reactions,
  • exothermic or endothermic reactions,
  • how to measure changes in enthalpy.

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