Respuesta :
The term that refers to a substance that is formed in one step of a reaction mechanism and consumed in a subsequent step of the reaction mechanism would be a reaction intermediate. It is a molecular entity that is formed from the reactants and reacts further to give the directly observed products of a chemical reaction.
Answer: Intermediate
Explanation: Intermediate is the term used to describe the mid term complex which have a very short life time during the process of the whole reaction mechanism.
It is formed as the product of the first step of the mechanism and it will be the reactant of the second step of the mechanism.
The life time of intermediate is approximately 10^{-6} seconds and it is detectable as well. Thus the geometry and other physical and c hem ial properties can be determined within its lifetime.