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Unformatted text preview: Activation Energy Barrier Temperature determines the fraction ( f ) of all molecules with E ≥ E a f = e − Ea / RT Arrhenius equation k = A e − Ea / RT frequency factor exponential factor Rate = k [H 3 CNC] = A e Ea/RT [H 3 CNC] Catalysts decrease the activation energy barrier 2 NO N 2 + O 2 Pt Catalysts decrease the activation energy barrier The catalytic converter in your car 2 CO + O 2 CO 2 2 NO N 2 + O 2 Pt catalyst Pt Pt 3 Enzymatic catalysis http://www.indiana.edu/~oso/animations/An6.html Wrap-Up Points: * Rates of reactions depend on the concentration of reactants and the temperature. * Temperature determines the fraction of reactants capable of overcoming E a , the activation energy barrier. As the temperature increases, a larger fraction of molecules have E > E a . * Catalysts increase rates of reactions by lowering their activation energy barriers....
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