I found Irish pretty difficult because I wasn’t very good at languages. I’m still trying to get better at Gaeilge though. I even have a book on computing written entirely in Irish that I am trying to read at the moment:
I did not like chemistry. I think it was to abstract for me – I couldn’t grasp the idea why some elements will react and why some won’t. Although, now that I think of it, it is very mathematical and logical.
However, I would love in chemistry classes when the teacher would show us some experiment. I remember once he dipped a very small piece of sodium (which is a metal) in water and then — wooow — it caught fire, inside the water. That was pretty cool!