You will definitely need calculus (and math beyond calculus up to differential equations, linear algebra) for physical chemistry. In particular, the concepts of differentials is very important in thermodynamics, differential equations and linear algebra are central to quantum (i.e. Schroedinger's equation is a differential equation), and statistical mechanics involves multidimensional calculus.

Even if you plan to do synthesis, you'll likely take a few advanced p-chem courses in college, so you'll need to take at least 1.5-2 years of college math for a chemistry major.