The employer probably received many applications for this position, and he needs to know why you’re more qualified for the job. It’s a difficult question to answer, especially since you know nothing about the competition. However, this is a good opportunity to sell yourself. Be specific and highlight personal qualities that make you an excellent match for a chemistry position. For example, you might be a problem-solver, safety conscience, detail-oriented and possess excellent math skills. Also, highlight any awards or recognition you’ve received in chemistry research.