Acatalyzed reaction will have a activation energy, and this leads to a in the reaction rate.

A catalyzed reaction will have a lower activation energy, and this leads to an increase in the reaction rate. Having a catalyst would make an alternative pathway for the reaction leading to lower activation energy. Hope this answers the question.

stands for electromotive force and it is measured in volts. despite its name, it is not actually the force in the sense of being a "pushing" or "pulling" (not measured in newtons).an equation that relates emf,  ℰ,  to a battery's terminal voltage, v, current, i, and internal resistance, r, is    ℰ = v + irin this case, the emf can be interpreted as a voltage—a difference in electric potential.i would not say that it would be considered an energy. if emf can be defined as the energy/work per a unit charge from a battery or other electric source, then it is not strictly energy.