Activation Energy For Edexcel Chemistry Unit 4. It's only short, because so far this is all I understand! 1.5 / 5 based on 2 ratings ? ChemistryEnthalpyA2/A-levelEdexcel Created by: AliceCreated on: 25-01-12 18:05 The Arrhenius equation k = Ae^(-Ea/RT) k = rate constant A = another constant R = gas constant: 8.31 JK-1mol-1 T = temperature (K) Ea = activation energy (J) You don't have to memorise the equation, you just have to understand how it works and the relationship between the factors. 1 of 2 Some relationships 1. As Ea increases, k decreases. Therefore, a large activation energy means a slow rate of reaction. 2. As T increases, so does k. Therefore, at higher temperatures, the rate is faster. 2 of 2
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