The background to the 2020 ‘exam’ (I use the term loosely), is that the CB have announced that UNITS 1-7 of the CED will be examined, but that UNITS 8-9 will not. That immediately creates problems, and poses questions that may never be answered. We’ll see.
So what’s the issue? Well, LO 7.14 asks students to understand that ∆G° is dependent upon on enthlapy and entropy. Not a problem when the course is complete, but unfortunately for the College Board, entropy and Gibb’s Free Energy are both UNIT 9 topics! That’s an issue.
What’s the answer? Well, it should be that the AP chemistry czar comes out and makes an amendment to the original announcement and says it it will be UNITS 1-7 that are examined, MINUS 7.14, OR he says that the CB expect that the WHOLE course will have been taught by teachers, even though some of it is not going to be examined in 2020. See the mess that this is already becoming? Do you suppose that type of absolute clarity will be forthcoming? We will see, but based upon the College Board’s track record I doubt it.
7.14 is ONLY the beginning of these issues, more on other in future posts.