Contact the graduate school office for specific questions and prerequisites for the program. There are usually subject areas and skills that you are expected to have learned as an undergraduate. For example, some programs may require a background in physical chemistry. If possible, meet with faculty and students in the program that interests you. If that is not possible, address your questions to the program via e-mail.
Doctoral programs vary, but in general they share certain common features.
Most programs involve about two years of course work at the beginning of the program. During this phase, the students also rotate through faculty research laboratories and attend research seminars. Students must have at least a B academic average to take the qualifying examination and continue in the program. Prior to beginning the dissertation research, the student will select a mentor with whom to work and will write a research proposal. The mentor, along with an advisory committee, will guide the student through the research phase.