Problem: Energy profiles for the uncatalyzed and bromide-catalyzed decomposition of H2O2.Where are the intermediates and transition states in this diagram?

FREE Expert Solution

We’re being asked to label the given energy diagram.


A graph has reaction progress on the x-axis and potential energy on the y-axis. Both axes are unscaled. Both an uncatalyzed and a catalyzed reaction are plotted; both begin with reactants at the same potential energy and lead to products at the same potential energy (lower than the reactants), but their energy profiles vary. For an uncatalyzed reaction, the reactants are 2 H2O2. The curve climbs to a smooth, high peak before leading to the products, which are 2 H2O plus O2. For a catalyzed reaction, the reactants are 2 H2O2 plus 2 Br- plus 2 H+. The curve climbs through two transition states (small peaks with the second higher than the first) before declining to the products (2 H2O plus O2 plus 2 Br- plus 2 H+). Both transition state peaks are lower in the catalyzed reaction than the single peak was in the uncatalyzed reaction.


Recall that an energy diagram is usually read from left to right


The components of a two-step energy diagram are:


View Complete Written Solution
Problem Details


A graph has reaction progress on the x-axis and potential energy on the y-axis. Both axes are unscaled. Both an uncatalyzed and a catalyzed reaction are plotted; both begin with reactants at the same potential energy and lead to products at the same potential energy (lower than the reactants), but their energy profiles vary. For an uncatalyzed reaction, the reactants are 2 H2O2. The curve climbs to a smooth, high peak before leading to the products, which are 2 H2O plus O2. For a catalyzed reaction, the reactants are 2 H2O2 plus 2 Br- plus 2 H+. The curve climbs through two transition states (small peaks with the second higher than the first) before declining to the products (2 H2O plus O2 plus 2 Br- plus 2 H+). Both transition state peaks are lower in the catalyzed reaction than the single peak was in the uncatalyzed reaction.

Energy profiles for the uncatalyzed and bromide-catalyzed decomposition of H2O2.


Where are the intermediates and transition states in this diagram?

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Energy Diagram concept. If you need more Energy Diagram practice, you can also practice Energy Diagram practice problems.