D. the potential energy of the reactants is low; the potential energy decreases gradually; then increases slightly.
All inside and out in the human body
Are you sure it isn’t SO3+H2O = H2SO4 because that would be combination (synthesis) A+ B=AB
Or SO3 + H2SO4 = H2S2O7
Because that would also be synthesis
At room temperature hydrogen chloride is a colorless gas with a sharp or pungent odor. Under pressure or at temperatures below –85°C (-121°F), it is a clear liquid.
Atomic number, because the atomic number is unque to each individua element.
