According to the Arrhenius relation for reaction rate, k = A e^(−Ea/RT), what does Ea denote?

the total energy possessed by the reacting molecules at temperature T
the proportion of molecules whose energy exceeds the activation energy of the reaction
the minimum energy threshold above which every colliding molecule will undergo reaction
the energy level below which all colliding molecules will react

Correct answer: the minimum energy threshold above which every colliding molecule will undergo reaction

Solution

Ea represents the activation energy, which is the minimum energy required for reactants to successfully collide and form products. This threshold ensures that only those molecules with sufficient energy can overcome the energy barrier for the reaction to occur.

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