If we have reaction: A + B = AB
The reaction rate from the Law of mass action is: V(1) = k*[A]*[B]
if the concentration of A is doubled(2*[A]) and the concentration of B is halved(1/2*[B]), the reaction rate become: V(2) = k*2*[A]*1/2*[B] = k*[A]*[B].
So reaction rate doesn't change: V(1)=V(2).
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