012609 - Factors Affecting the Rate of a Reaction Reactant...

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Factors Affecting the Rate of a Reaction y Reactant Concentrations – more reactants leads to more collisions and formation of more products y Stoichiometry of Elementary Steps – the more things that need to collide the harder it will be to organize y Temperature – Kinetic Molecular Theory of Gases, the higher the temperature the higher the velocity and the more likely things are to collide
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Factors Affecting the Rate of a Reaction y Molecular Orientation – need to have the reactants properly oriented with respect to each other otherwise we cannot form the products
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Collision Model y Molecules must collide to react. y Only a small fraction of collisions produces a reaction. y Activation Energy – threshold energy that must be overcome to produce a chemical reaction (E a ) y Activated Complex – the arrangement of the atoms at the top of the barrier
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Collision Model
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Molecular Orientations
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Rate Constant y k = zpe -(Ea/RT) y R = 8.3145 J/K*mol y T = Temperature in K y E a
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012609 - Factors Affecting the Rate of a Reaction Reactant...

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