Morning PP, happy days. I remember doing this chemistry stuff at age 14/15 (for specific heat) - actually it was in Physics too- and maybe first year A level for the pH log calculation, but A level was my limit for Chem/Physics.
It's amazing how much we remember though- we must have been taught well because if i have to do a science cover lesson now it all comes back to me and the kids assume I'm a science professor (Some say I do look like Einstein though which helps.)
I did some contract and company law for a year or two after university (where I'd done Maff as you say) but it was a slog-. All I remember now is Donoghue v Stevenson- probably the first one you ever did.