Well duh, my point is that Newtonian physics is a subset of QM, but doesn't need to be. In fact it's an important result in QM that QM becomes Newtonian in the

Well duh, my point is that Newtonian physics is a subset of QM, but doesn't need to be. In fact it's an important result in QM that QM becomes Newtonian in the limit. Chemistry, on the other hand, is QM. All of it. You can empirically get around it like alchemists did for a while. But it sucks. This is partially why chemists accepted the existence of the atom far (far) earlier than physicists who stuck with continuum theories - their empirical methods were banging against the wall.