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Activation energy

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Chemical kinetics index
Activation energy diagram
The Arrhenius equation shows that a plot of 1/temperature against ln(reaction rate) is linear, with a gradient corresponding to the activation energy of reaction. This calc uses two points to determine activation energy (Ea).
Rel. rate at lower temp
lower temperature
Rel. rate at higher temp
higher temperature

Activation energy (Ea)
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For this calc it is necessary to fill in the relative reaction rates at two different temperatures. Once found, the activation energy can be used in other calcs. We should note that two points are not normally sufficient for an accurate calculation, and usually a plot is required.
The Arrhenius equation is also used to as a mathod to make "accelerated aging" tests on (for example) consumer products under certain conditions.