BIOL107 Lecture Notes - Lecture 5: Gibbs Free Energy, Thermodynamics, Endergonic Reaction

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BIOL107 Full Course Notes
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BIOL107 Full Course Notes
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The analysis of which reactions (chemical or physical) are spontaneous, will happen on their own. In situations of constant temperature and pressure, which is typically the situation for living organisms, the thermodynamic property gibbs free energy is what determines the direction of a reaction. If the change is gibbs free energy ( g) is negative, then the change will happen spontaneously. If g is positive, the change is not spontaneous, and the fact the reverse change will be spontaneous. The general formula for calculating the gibbs free energy of a change is: Every value of the concentrations of each product multiplied together. Applicable to conditions of constant temperature and pressure (most relevant for biological systems) Describes the linkage between enthalpy and entropy. For any chemical or psychical reaction, the g decrease for a spontaneouss reaction. G = g end - g start = h - t s.

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