Chem112 Day 8.docx - Chemistry 112 – Day 8 The effect of Temperature on Reaction Rate o A good approximation for the effect of temperature is that at

Chem112 Day 8.docx - Chemistry 112 – Day 8 The effect of...

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Chemistry 112 – Day 8 (9/23/2019) The effect of Temperature on Reaction Rate o A good approximation for the effect of temperature is that at temperatures around room temperature an increase of 10 C will result in a reaction being 2-3 times as fast. o In our rate laws, how is the temperature factored in? Arrhenius Equation o k = Ae -Ea/RT o A = frequency factor o Ea = activation energy o T = temp in K o R = gas constant 8.314 J/(mol x k) Arrhenius Equation Break Down o Frequency Factor Number of approaches to the activation barrier per unit of time. Just because a molecule approaches the barrier does not mean that it makes it over. Arrhenius Plots o ln k vs 1 t o ln k = - Ea R ( 1 T ) + ln A o 2-point version o ln k 1 k 2 = Ea R ( 1 T 2 1 T 1 ) Problem: o You run a series of experiments of a 1 st order reaction at varying temperatures. You plot the natural log of the rate constant vs. the inverse of the temperature in Kelvin. Your graph is a straight line with the following equation: y = -1.12 (10 4 x) + 26.8 What is the energy of activation?
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