The Ancient Greek section is conservation of energy because energy is needed to create anything. albert einsiten is both. engery of reactents is eneryg because it has energy in it. 26 grams of bla bla bla is in mass because it contains mass mats. (mats are materials) endo stuf stuf is mass because it is created by too elementos. Na+Cl is conservation of both because it takes energy to make it and mass.