This Shows a 2 step reaction A into I then I into B.
A to B is the overall reaction.
Step 1 : Rate determining step where A turns into I this is
an endothermic reaction as I is higher in energy than A. also high activation
Step 2: This is the faster step of the reaction where I turns
into B. B is lower in energy so is exothermic. Also low activation energy (Ea)