Two aqueous reactions, R1 and R2, occur separately at the same temperature with identical initial reactant concentrations of 0.10M.
R1: rate = k1[A]2[B] (overall order = 3)
R2: rate = k2[A][B]0.5 (overall order = 1.5)
Both reactions involve the same reactants A and B but proceed by different mechanisms.
(1) Part 1: For each reaction, predict the factor by which the initial rate will change if the concentration of A is doubled while B remains at 0.10M. Show your calculations.
(2) Part 2: Compare the sensitivities of R1 and R2 to changes in concentration of A. Explain the chemical significance of the difference.
(3) Part 3: Under otherwise identical conditions, which reaction would you expect to reach 75% completion first? Justify your answer using the overall reaction orders as evidence.