Chemistry
Chemistry
Problem
For a certain reaction, the highest activation energy along the uncatalysed pathway is . Introduction of a catalyst changes the mechanism so that the highest activation energy becomes . Calculate the percentage decrease in the highest activation energy achieved by the catalyst.Intuitive explanation
A catalyst works by offering an alternative route with lower energy barriers—the key is comparing the activation energies of the rate-determining steps before and after. Since activation energy directly controls reaction rate through the Arrhenius equation, lowering the highest barrier along the pathway is exactly how a catalyst speeds things up. You just need to find what fraction of the original barrier was eliminated, then convert to a percentage.
Intuitive explanation
A catalyst works by offering an alternative route with lower energy barriers—the key is comparing the activation energies of the rate-determining steps before and after. Since activation energy directly controls reaction rate through the Arrhenius equation, lowering the highest barrier along the pathway is exactly how a catalyst speeds things up. You just need to find what fraction of the original barrier was eliminated, then convert to a percentage.