My 2017 AP Chemistry Released Exam Draft Answers & Comments appear below. The questions are here. These are DRAFT answers and may change as errors are pointed out to me, and other thoughts come to my mind. Should you find an error PLEASE let me know by commenting on this post below, rather than emailing me or using the contact form me (that way all problems can be addressed in this post), and I will comment/change as necessary.
PLEASE NOTE: Any of my comments below about how your individual answers might be graded, are highly speculative – you should not take them as fact.
Many, many, many words. Reading comprehension rules more than ever, but overall an easy exam I think.
Specific Question Comments
Not much to report here, although in 1(c)(ii) I suspect the effect of lone pairs is now well and truly dead and buried, so not only will a wide-range of angles be acceptable, they will probably be quite content with 109.5°.
In d(i) don’t put hydrogen bonding! It may or may not cost a point, but just don’t do it!
In (a) a ton of people that CAN calculate formal charge will not get the point about negative charges residing on more electronegative atoms.
Part (d) is tricky IF it wants something OTHER than capacity. The ratio change is a subtle point, and gets far too (indeed perilously) close to an exclusion statement for my liking, i.e., that the computation of changes in pH of buffers are not required. Yes, I know no calculation is required here, but still…
In (b) I cannot imagine a calculation of Rf would be required.
I’m confused by part (c). A MASSIVE amount of unnecessary text seems to complicate the question and the chemistry much more than required, but this is what the TDC/CB does these days. They want “storytime” context, and “real life situations”. Get ready for more of this nonsense.
I think that there is the possibility of DIFFERENT answers to mine scoring full credit! Maybe…
Nothing to add.
Nothing to add.