Bio1A+Lecture+6_Metabolism

Work reaction coordinate diagram free energy g is

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Unformatted text preview: ergy change of a reaction tells whether or not the reaction occurs spontaneously •  Biologists want to know which reactions occur spontaneously and which require input of energy •  To do so, they need to determine energy changes that occur in chemical reactions •  A living system’s free energy is energy that is available to do work when temperature and pressure are uniform, as in a living cell Free-Energy Change, ΔG •  The change in free energy (∆G) during a process is related to the change in enthalpy, or change in total energy (∆H), change in entropy (∆S), and temperature in Kelvin (T): ∆G = ∆H – T∆S •  Only processes with a negative ∆G are spontaneous •  Spontaneous processes can be harnessed to perform work Reaction coordinate diagram Free energy, G, is plotted as a function of the reaction progress (the reaction coordinate). The starting point for the forward or reverse reaction is call...
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