<p>Every single thing in the AP chemistry curriculum assumes that you already know basic stoichiometry. So because you didn’t take chemistry before, you’ve been spending the entire year learning the basic concepts that most people in the class already learned.</p>
<p>And unfortunately, yes, a C both semesters is going to be a significant negative. AP classes are meant to be hard, but that doesn’t mean colleges don’t expect you to do well in them.</p>