Which term best describes the measure of the increase in the concentration of a product per unit time?

Question

activation energy, kinectics, reaction reaction rate, reaction time

im stuck i think its activation energy can someone confirm this or let me know what is the correct anwser?

I've answered this before but perhaps not for you. The reaction rate is a measure of the change in concentration of a substance per unit time. Activation energy is the energy that must be attained before a reaction will start although thermodynamics tells us that the reaction is spontaneous.