Activation Energy

For Edexcel Chemistry Unit 4. It's only short, because so far this is all I understand!

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  • Created by: Alice
  • Created 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.

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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.

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