An intermediate in a chemical reaction is a species that the reactant molecules interact with during an early step in a reaction that is regenerated during a later step in the reaction. True or False? Please explain why so I can understand. Solution yes Areaction intermediateor anintermediateis a molecular entitythat is formed from the reactants (or preceding intermediates) and reacts further to give the directly observed products of a chemical reaction. Most chemical reactions are stepwise, that is they take more than one elementary stepto complete. An intermediate is the reaction product of each of these steps, except for the last one, which forms the final product. ractive intermidiatesare usually short lived and are very seldom isolated. Also, owing to the short lifetime, they do not remain in the product mixture..