Kinetics of Nucleophilic Substitution 9. the exact rate at which a starting material reacts to give product is called the reaction rate and can often be measured In all chemical reactions there is a direct relationship between reaction rate and reagent concentrations When we measure this relationship We measure the kinetic of the reactionOrganic Chemistry Organic Chemistry Xiamen Xiamen University University Kinetics of Nucleophilic Substitution „ The exact rate at which a starting material reacts to give product is called the reaction rate and can often be measured. „ In all chemical reactions, there is a direct relationship between reaction rate and reagent concentrations. When we measure this relationship, we measure the kinetic of the reaction