In the Acid-Base reaction described by the chemical equation below, which of the substances is acting as the acid?
H2CO3 + H2O HCO3 + H30+

Select all of the statements which are true. electrons are located in shells or orbits around the atom. electrons orbit slowly around the atom. electrons travel in one flat path around the nucleus of an atom. the valence of an atom is determined by the number of electrons in the atom's outermost shell.