The answer is;
first blank-
A
Second blank-
B
Activation energy raised the potential energy of reactants to begin a chemical reaction. This requires an initial input of energy into the reaction before the reaction can then proceed spontaneously. That delta G of the activation energy is usually positive. This activation energy destabilized the stable bonds of the reactants so they can form new bonds. This results to a transition state that is a high-energy state.
