Batteries and cells

• Calculating energy change for a chemical reaction using bond energies

  1. Break bonds on left side

  2. Make bonds on right side

  3. Calculate total energy input

  4. Calculate total energy output

  5. Subtract energy output from energy input to get overall energy change
• Bond energy


  Energy required to break or make a chemical bond
• The positive sign indicates energy input (endothermic) and the negative sign indicates energy output (exothermic)