Which definition describes activation energy.?
the speed at which reactants form products in a chemical reaction
the short-lived, high-energy intermediate between reactants and products
the diagram showing a change in energy between reactants and products
the minimum energy that a set of reactants must attain before reaction can occur

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.