good chem website

http://csi.chemie.tu-darmstadt.de/ak/immel/script/redirect.cgi?filename=http://csi.chemie.tu-darmstadt.de/ak/immel/tutorials/chirality/index.html

Bioenergetics and thermodynamics studies in biochemical reaction.

Bioenergetics is the studies of how organisms manage their energy resources and how energy is transformed in biological systems.it is the studies of the energy changes accompanying biochemical reactions.it provides the underlying principles to explain why some reactions may occur while others do not.

The change in free Gibb's energy or the Gibb's free energy is that portion of the total energy change in a system that is available for doing work.

if the change in free Gibbs energy is positive,the reaction is endergonic and non-spontaneous.
if the change in free Gibbs energy is negative,the reaction is exergonic and spontaneous.

at equilibrium,the change in free Gibbs energy is zero.

the first law of thermodynamics states that the total energy of a system including its surroundings,remains constant.However,the energy may be transformed or tranfered to another form of energy.

The second law of thermodynamics states that the total entropy of the system must increase for a reaction to occur spontaneously.Entropy is the measure of the degree of randomness and disorder of a system while enthalpy is the heat content of a system.Entropy is a portion of the enthalphy that is not available to do useful work.

Catabolism is an exergonic process releasing energy that involves the break down and oxidation of molecules.
Anabolism is an endergonic process requiring energy input that involves the building up of substances.
A metabolism consists of catabolism and anabolism.it is the sum of the chemical reactions of biomolecules in an organism.