Question

What are activation energies?

Answer 1

In chemistry and physics, activation energy is the energy which must be provided to a chemical or nuclear[1] system with potential reactants to result in: a chemical reaction,[2] nuclear reaction, [3]or various other physical phenomena.[4][5]

The activation energy (Ea) of a reaction is measured in joules (J) and or kilojoules per mole (kJ/mol) or kilocalories per mole (kcal/mol).[6]

Activation energy can be thought of as the magnitude of the potential barrier (sometimes called the energy barrier) separating minima of the potential energy surface pertaining to the initial and final thermodynamic state. For a chemical reaction, or division[7] to proceed at a reasonable rate, the temperature of the system should be high enough such that there exists an appreciable number of molecules with translational energy equal to or greater than the activation energy.

The term Activation Energy was introduced in 1889 by the Swedish scientist Svante Arrhenius

Answer 2

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➺ the energy required to form this intermediate , called activated complex (C) , is also known as activation energy