Ch_322a_6.08

Ch_322a_6.08 - The Role of Kinetic Energy The Boltzmann...

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The Role of Kinetic Energy The Boltzmann Distribution At a given temperature, molecules will have a distribution of kinetic energies (1/2 mv 2 ) called a Boltzmann distribution . The shape of the curve changes with temperature as shown below. fraction of molecules kinetic energy ( 1/2 mv 2 ) The distribution of kinetic energies moves to higher values and the curve broadens with increasing temperature. T 1 T 2 T 2 > T 1
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Kinetic Energy and the Energy Barrier Only those colliding molecules with sufficient kinetic energy to reach the free energy barrier, ! G , will react. fraction of molecules Distribution of Kinetic Energies of all Colliding Molecules energy ! G A fraction of effective collisions = Area A Total Area under curve When reactants collide, their kinetic energies are available to move them towards the top of the barrier in the free energy diagram. As molecules surmount the energy barrier, kinetic energy is being transformed into chemical potential energy . Note that the fraction of
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Ch_322a_6.08 - The Role of Kinetic Energy The Boltzmann...

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