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42-Kinetics-Arrhenius-Eq-Ans - CHEMICAL KINETICS...

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CHEMICAL KINETICS TEMPERATURE RELATIONSHIP ARRHENIUS EQUATION GCHEM II CONCEPT ANSWERS Temperature Reaction Rate Dependency states that a reaction rate is faster at higher temperature because the reaction rate constant (k) is larger. Reaction rate constant is fixed for a given temperature. Reaction rate constant ln (k) plotted versus 1/temperature (1/K ) for a given reaction will result is a exponential shaped curve represented by the following equation: Arrhenius Equation: k = A e —Ea/RT ln(k) = lnA – Ea/R * 1/T y = b slope * x where A = frequency factor [ln(A) = equal b (y intercept)] Ea = activation energy (J/mole) T = temperature (K) R = gas law constant 8.314 J/mole - K Activation Energy: Ea = – (slope) * R Two Point Activation Energy: ln (k 2 /k 1 ) = + Ea/R (1/T 1 – 1/T 2 ) where k 2 and T 2 are higher values 1) The following equation was obtained from a plot of ln k versus 1/T for the reaction of NO(g) + O 3 (g) NO 2 (g) + O(g) y = – 2345x + 23.54. What is the activation energy ? frequency factor ?
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