Question

which is the best definition of activation energy? the energy required to end a chemical reaction the energy required to bind a substrate to an active site the energy required to form or break the bonds of reactant molecules the energy required to re - form bonds in product molecules

Explanation:

Activation energy is the minimum energy that reacting molecules must possess to undergo a chemical reaction. It is related to the energy needed to break or form bonds in reactant molecules to start the reaction. Binding a substrate to an active - site is related to enzyme - substrate interactions, ending a reaction and re - forming product bonds are different concepts from the initial energy input for the reaction to start.

Answer:

the energy required to form or break the bonds of reactant molecules