Chemistry 5070 · O Level · Exothermic and endothermic reactions

Exothermic and endothermic reactions — practice question

The diagram shows an energy profile. What does arrow R on the diagram indicate?

  • Aan endothermic energy change
  • Bthe activation energy
  • Cthe energy taken in by the reactants
  • Dthe enthalpy change of the reaction

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