Official course description: Chemistry 235 is a co-requisite of Chemistry 233. If you have already taken, and passed, Chem 235 in a previous semester, you do not have to take it again. If you chose to withdraw from Chem 233 later in the semester, you may remain in Chem 235 with the consent of your laboratory instructor. There have also been issues related to scheduling of the lab. If all lab sections are full, and/or you cannot fit Chem 235 into your schedule, you may take it in a later semester.