BI110 Lecture Notes - Lecture 23: Endergonic Reaction, Activation Energy, Living Systems
Document Summary
Gibbs free energy can be calculated for any molecule. The g of a + b = ginitia. G for the reaction can then be calculated: g = gfinal ginitial. If g is positive, it is an endergonic reaction. In endergonic reactions, the source of the energy is almost always atp. Spontaneous does not necessarily imply fast; it means energetically favourable . Two factors can give rise to -, and therefore spontaneous reactions: negative. Large loss of potential energy: products are less ordered than reactants (entropy increases a lot), there is a large positive, Associated with stability: more free energy, less stable, greater work capacity. Spontaneous change : less free energy, more stable, less work capacity. Equilibrium is maximum stability: reached when reactants are converted to products and products are converted back to reactants equal rates, every reaction has a different equilibrium state. Endergonic reactions are non-spontaneous and require and input of energy to proceed.
