Which is the best definition of activation energy? a. the energy required to end a chemical reaction
b. the energy required to bind a substrate to an active site
c. the energy required to break the bonds of reactant molecules
d. the energy required to re-form bonds in product molecules

Four objects each with charge +2.0×10−7c are located at the corners of a square whose sides are 2.0 m long. part a what quantities can be determined using this information? check all that apply. the electric force on a charged object placed at the center of the square. the mass of each object. the total electric potential energy of the system consisting of the four charged objects. part b find the electric force on a charged object placed at the center of the square.