I would rather help you to understand something before a test or before a lab report is due, than to find out you don't understand it while grading your work. Only absences notified ahead of time may be excused. Barring exceptional circumstances, all subsequent missed exams will receive a grade of zero. Because students often work in groups in lab, absences hurt everyone and should be avoided. In addition, most days there will be graded homework problems assigned.
Many students find it useful to keep a copy of the problem to review.
No late homework will be accepted and the lowest homework grade will be dropped. If you must be absent, have someone else take notes and hand in any assignments for you. Students are responsible for knowing material in the assigned reading, problems, labs, and lectures. Working problems, studying and understanding the material are keys to doing well. It is assumed that the students are familiar with the background material in Chemistry, Physics and Mathematics.