What is the difference between chemical and physical methods for studying chemical kinetics? What ...

In chemical methods, a chemical process is used to quantify molecular concentrations. For example, a portion of the reaction sample may be removed, the reaction terminated, and the concentration of reactants or products is then measured. Physical methods involve measurement of some physical property of the system that changes as the reaction proceeds. Physical methods are in general more convenient, as the probe for the physical change are often located within the reaction vessel permitting measurement without having to disrupt or terminate the chemical reaction.