Question

what is the difference between spontaneous reaction and activation energy​

Answer 1

Explanation:

Spontaneous processes are reactions which proceed without requiring an input of energy because the products are at a lower, more stable energy state than the reactants.

WHILE

Activation energy is the amount of energy expressed in joules that is required to convert the molecules in one mole of a reactant from a ground state to the transition state. It can also mean the energy that an atomic system must have before an emission or chemical reaction can occur.

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Answer 2

Spontaneous reaction is a process which occurs without any extreme input to the system.
Well as activation energy is the minimum amount of energy that must be provided for compounds to result in chemical reaction.