if when a reactant is increased ,say doubled, and the rate of reaction also dsoubles this reactant is said to be a first order reactant , the amount by which the reactant changes is equal to that of the change in the rate of reaction
If the reactant is doubled and the rate of reactantion is quadrupled this means that the this is a second order reactant, as the rate of reaction is increasing by the change in the reactant squared. So if a second order reactant was tripled the rate of reaction will be increased 9 times.
a reactant with zero order has no effect on the rate of reaction when it is increased or decreased.
The overall order of a reaction is the sum of the orders of each of the reactants and if a reaction has an order which is not a whole number this means that there is more than one rate determining step and that it is a chain reaction
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