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This lesson covers reaction profile diagrams in detail, the concept of bond energy, and how to calculate the overall energy change of a reaction using bond energies as required by the Edexcel GCSE Combined Science specification (1SC0). Bond energy calculations are a Higher tier topic but understanding reaction profiles is needed by all students.
A reaction profile (also called an energy level diagram) is a graph that shows how the energy of the reacting system changes during the course of a reaction.
| Label | What it represents |
|---|---|
| Reactants | The starting energy level (labelled on the left) |
| Products | The final energy level (labelled on the right) |
| Activation energy (Eₐ) | The energy difference between the reactants and the peak of the curve |
| Overall energy change (ΔH) | The energy difference between reactants and products |
| Progress of reaction | The x-axis label |
| Energy | The y-axis label |
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