A
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Re: A
[A]0 represents the initial concentration and [A] represents the concentration of the reactants!
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Re: A
Also note if you were ever confused that A naught is how we refer to [A]0, and that the little 0 symbol, or naught, does often mean the initial or starting point when it is in the lower position (whereas it would usually mean under standard conditions if it were in the upper position).
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Re: A
In the Arrhenius equation, A does not represent concentrations. Instead, it is a reaction-based constant that describes the spatial requirements for the reaction to occur. If k is large, meaning that the reaction rate will be large, then A will also be large. A large A tells us that the spatial requirements for the reaction to occur are not demanding, whereas a small A tells us that they are.
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