The Activation Energy is the energy required before the reaction activates.
So the answer is "The additional energy required for reactions to occur spontaneously"
Answer:
<em>the answer is chemical property since acid is involved.</em>
Unbalanced,
Na + Cl2
Na = 1
Cl = 2
NaCl
Na = 1
Cl = 1
Basically, both the reactants and products must have equal amounts of each element.