Give the rate equation , overall order and molecularity of the following elementary reactions.
(1) `A+BrarrC` (2) `2ArarrD`

Explanation

In the rate equation of an elementary reaction , the power of the concentration terms of reactants is equal to the stoichiometric coefficient or number of moles of the reactants in the balanced equation of the reaction.
The overall order of an elementary reaction = molecularity of the reaction = total number of moles of reactants in the balanced equation of the reaction
(1) reaction rate = k [A] [B] and overall order = melecularity = (1+1) = 2
(2) reaction -rate = `k[A]^(2)` and overall order = melecularity = 2