Most first-year students are supported on graduate teaching assistantships (TA), which are normally guaranteed upon admission to the graduate program (and demonstration of proficiency in written and spoken English). The current TA stipend is $23,000/year (less for those non-native english speakers who do not pass the university english exam with a 3 or higher - see below). Furthermore, students are automatically considered for Department and College scholarships and many applicants receive substantially higher offers.
Typically, as a graduate teaching assistant, you will have primary teaching responsibility for a group of undergraduate students in general, organic or analytical chemistry. This responsibility includes supervising laboratory instruction, leading recitation and discussion groups, grading and attending meetings.
Beyond the first year, students may be supported on research assistantships. Research assistantships generally are made available by specific professors, who have funding through grants and contracts to support students working on their research projects. These assistantships are generally awarded to second-year or more advanced students, and frees the student from teaching responsibilities and allows full effort to be devoted to research activities.
Several fellowships are available to incoming graduate students.