Physical Chemistry is a lot more headache inducing than either the introductory chem or physics classes. Like most classes the professor is always a big factor. If you like math and do it well, you'll have no problems and may even enjoy PChem! Make friends with a math major - if you can convince one to take PChem with you, pay them in copious quantities of pizza and beer for math "tricks" and your life will be much easier. I picked their brains for OChem pearls in return. I was told by four people that if I hadn't helped them through the math part they probably would have failed PChem. I wish I'd had abstract algebra before PChem - would have made symmetry groups MUCH easier to really grasp and manipulate.
but I found it much easier after complex analysis, linear algebra I and II, noneuclidean geometries, and a few other upper level math classes. You can definitely do PChem with Calc I, II and III. I'll say with absolutely no qualms that the other people in my class were NOT as happy in that class as I was - they didn't have the extensive math background. Actually thought it was easier than second semester OChem, and WAAAY easier than advanced calc. Isn't this what classmates and college friends are for? Surely you know someone at your school who has taken P-chem. Even so, it's going to vary widely from school to school and professor to professor. Then you would know-oh, I suck at calc, I better watch out for P-chem OR oh, I rock at calc, bet I'll ace P-chem. It might serve you better to ask what P-chem is comprised of-calculus, lots of equations, theoretical models, derivatives and integrals, etc. Plus, P-chem is different at every single college. The point is, what can you possibly learn by asking people who are incredibly varied how hard a random class is? It just feeds this pre-med mentality of freaking out over every little class and every little grade.
I'm sure gold once was pretty hard, then it was iron, then it was steel, now it's titanium. If it's the former pretty soft, if it's the latter, pretty damn hard. How hard is a feather bed? Well, it depends if you're lying on it or if your hurdling towards it at terminal velocity. What's hard is entirely a matter of opinion and varies with perspective. People have different abilities and learn at different rates.
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