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Equation 1 · Part 2 · How Chemical Dynamics and Catalysis Actually Work

Symbol A

k=A e−Ea/RTk = A\, e^{-E_a/RT}
AA

What this part means

A is one of the signed contributions combined to compute the quantity on the left.

Its job in the formula

A is one of the signed contributions combined to compute the quantity on the left.

The passage around this formula

A useful way to see why the peak exists at all is the Arrhenius picture underneath it. The observed rate constant is k=A e−Ea/RTk = A\, e^{-E_a/RT}. and a catalyst’s whole job is to substitute a smaller EaE_a — the barrier of the new surface-mediated path — for the barrier of the uncatalyzed reaction, without introducing a rate-limiting binding or release step that reintroduces a large barrier somewhere else in the cycle.

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Learn the underlying idea

A variable is a named place for a value. Its letter is a local label: x can mean position in one formula and a data point in another.

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Sources cited in the article section

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