I'm in forth year now. I'm taking some upper year courses in C&O and Pure Math. I'm also taking elective of the first year variety. In order to get this Honours Math degree, they tell me I have to take ten courses that aren't math courses. So I say to myself, "I should take chemistry. I did that in high school. It should be easy."
So I took Chem 120, and boy was I wrong. It was beyond easy. We spent 8 weeks learning multiplication! Multipli-freakin-cation. They even threw some division in there for good measure. So after an experience like that, what do I do? Why, take Chem 123 this term!
We're learning about cubes. Cubes! The three dimensional platonic solid. What's the volume of the cube? What's the mass? Now remember that division from last term — find the density!
I highly recommend that all mathies take Chem 120 and Chem 123 as electives in upper year to help take a load off of your other courses. The best part are the on-line quizzes they have. You get five chances at each quiz. Yes, five, and the quiz doesn't change between attempts and they tell you which of your answers were correect!
Take it early, take it often.