Activation Energy and Reaction Types — NEET Biology
📚 Practice ConceptThe y-axis represents the potential energy content. The x-axis represents the progression of the structural transformation or states through the 'transition state'. You would notice two things. The energy level difference between S and P. If 'P' is at a lower level than 'S', the reaction is an exothermic reaction. One need not supply energy (by heating) in order to form the product. However, whether it is an exothermic or spontaneous reaction or an endothermic or energy requiring reaction, the 'S' has to go through a much higher energy state or transition state. The difference in average energy content of 'S' from that of this transition state is called 'activation energy'.
Assertion (A): All chemical reactions require activation energy to proceed regardless of their energy balance. Reason (R): Both exothermic and endothermic reactions need energy input to reach the transition state.
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