Reaction Orders
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Reaction Orders
What do reaction orders mean? And what would be the difference between a first order and second order reaction?
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Re: Reaction Orders
Order of a reaction is just the relationship between the rate and the concentration of the reactant. It is calculated utilizing a chart similar to that in the notes where we see how concentration affects the rate of the experiment we are running under different scenarios. A first order reaction is a reaction based solely on one reactant with order of one, but a second order reaction is either two reactant each with order of one or one reactant with an order of two. The difference stems from the relative effect of the reactants concentrations on the reaction rate.
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Re: Reaction Orders
The order of reaction is the power of the reactant's concentration term in the rate equation.
Therefore, for a first-order reaction, rate=k[A]^1=k[A]; while for a second-order reaction, rate=k[A]^2; so on and so forth for third-order, fourth-order or fifth-order reaction.
As the order of reaction differs, the change in that particular reactant's concentration will have different impact on the reaction rate. e.g., in a first-order reaction, when that particular reactant's concentration is doubled, the reaction rate will be doubled; while in a second-order reaction, the when that particular reactant's concentration is doubled, the reaction rate will be timed by a factor of 4.
Therefore, for a first-order reaction, rate=k[A]^1=k[A]; while for a second-order reaction, rate=k[A]^2; so on and so forth for third-order, fourth-order or fifth-order reaction.
As the order of reaction differs, the change in that particular reactant's concentration will have different impact on the reaction rate. e.g., in a first-order reaction, when that particular reactant's concentration is doubled, the reaction rate will be doubled; while in a second-order reaction, the when that particular reactant's concentration is doubled, the reaction rate will be timed by a factor of 4.
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