Free energy of activation vs. activation energy [ENDORSED]

[Alyssa_Hsu_2K]

Does Free energy of activation = activation of energy?

Hence, if we know the activation energy of something, could we then figure out delta G and whether the reaction is spontaneous or not?

[Chem_Mod]

The free energy of activation is directly related to the activation energy but they aren't exactly the same. The free energy of activation takes entropy into account while the activation energy does not.

[sarahforman_Dis2I]

The free energy of activation is directly related to the activation energy but they aren't exactly the same. The free energy of activation takes entropy into account while the activation energy does not.

What do you mean when you say "the free energy of activation takes entropy into account"?

[Chem_Mod]

Activation energy includes only the enthalpy.

Free energy of activation includes both the enthalpy and entropy.

[Julianne_Sue_3A]

So to clarify ...

Free energy is amount of energy available for work in a thermodynamic system, which includes the enthalpy and entropy. This means that it must be determined by the present system, and not the history of it. Are Helmholtz and Gibbs two different types of free energy, or are they the same terms for it? I remember that Gibbs involves constant pressure and temperature, but I think the volume varies, hence affecting the energy.

On the other hand, activation energy only includes enthalpy and it's the amount of energy required for chemical reactions (see chart below). Activation energies can also be reduced by catalysts (enzymes).

Are the statements above correct?