A student drew a reaction profile for the reaction between hydrogen and oxygen - AQA - GCSE Chemistry - Question 7 - 2020 - Paper 1

The activation energy should be represented as a line that begins from the reactants and rises to the peak of the curve representing the transition state. In the student's profile, the activation energy line may not start from the reactants as required.

The products should lie below the reactants in energy level since the overall reaction releases energy. If the products are shown as having more energy than the reactants, it depicts an endothermic reaction, which contradicts the nature of the reaction that releases energy.