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Changing the concentration of substances taking part in a reaction usually changes the rate of the reaction. A rate equation shows this effect mathematically. Orders of reaction are a part of the rate equation (the exponent). If the order of reaction with respect to A is 0 (zero), this means that the concentration of A doesn't affect the rate of reaction. Mathematically, any number raised to the power of zero (x^0) is equal to 1. That means that that particular term disappears from the rate equation. If a reaction rate depends on a single reactant and the value of the exponent is one, then the reaction is said to be first order. A second order reaction is a type of chemical reaction that depends on the concentrations of one second order reactant or on two first order reactants. Thisreaction proceeds at a rate proportional to the square of the concentration of one reactant or the product of the concentrations of two reactants.
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