What is the difference between spontaneous reaction and activation energy​

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.

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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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colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.