@lp3575 usually they only check sig figs on one problem so I doubt you’ll lose more than a point or two
curve predictions?
So, here’s what I know.
Mock graded my free response based on Adrian Dingle’s draft answers… projected my points as shown (errors were credited as they have typically been over the years…
MC: At least 42/60 i know for sure are correct, no idea about the other 18. Most of them were between two or three choices.
Free Response: Q1: 5 // Q2: 9 // Q3: 7 // Q4: 2 // Q5: 4 // Q6: 2 // Q7: 4
Overall, with any potential source of error, it should be at least low 70’s, maybe high 60’s. Do you guys think this is enough for a 5?
This is my second time taking this exam. I just want my damn 5 
(4 last year, committed to Carnegie Mellon, and they only take 5’s)
I think this year’s curve will be higher. Dont rely on this prediction, but relative to the 2015 exam (which was very easy, especially frq), this exam was harder.
For the one with the student’s hypothesis to see if it’s ionic, would talking about putting the compound in water to see if it conducts electricity be an acceptable answer?
Did anyone’s school give both forms? I thought they couldn’t do that because one of the forms is the one they use for makeups or whatever but I and about 10-20 (I think) other people at my school got the alternate form. Idk if it’s protocol to give half the people one and the other half the other, it’s just never been done on an exam I’ve taken previously
@laxgoalie60 @bsdsj22 I believe there are 6 different versions of the test (2 US, 2 International, and 2 Makeup). They will only reason the “main” US version, so if you didn’t have the version that is currently up then: A) you can’t discuss your questions with anyone ever, and B) they will not be releasing those questions.
@ChessKing10 I believe that it will be acceptable… ionic compounds dissolve and conduct electricity, unlike other compounds.
7 will be the really strict sig fig problem.. If you didn't go out two decimal points on 7a, I can almost guarantee you lost the point there.
@cheri123 The makeup exam is different than the alternative version. I believe there are 6 exam versions (2 US, 2 International, and 2 Makeup).
@Homsar Keep in mind that on the MC section, only 50 of the questions actually count… The other 10 are thrown out (no matter if you get them right or wrong). So % wise, your 42/60 is actually about a 35/50… combine that with your graded FR score according to you of 36/50 (after adjustment), you will be at a 71… I think that will be just below what I expect the cut line to be at for a 5… (I’m thinking in the 72-75 range will be the cut line for 4/5)
Thank you, @APChemTeacher, for your analysis and responses.
Additionally, my AP Chemistry teacher told us that last year that the AP graders forgave one significant figure. I do not know if this policy is in place this year, but that is the information that he passed along to us. Can anybody else confirm/deny?
@Homsar Most questions yes, but occasionally there is a question where you have to have the exact correct # of sig figs to get the point (never more than one/test). Based on the ease of 7a, I’d assume that is going to be the case in that question.
Oh really? So 10 are experimental
Oh dear
@APChemTeacher 2 decimal places?? both data points were 3 sig figs and since it was a number in the 30’s 3 sig figs would be 1 decimal place? Ugh I’m so scared I lost easy points.
I already know I missed the Lewis structure and now I’m scared i just made a bunch of stupid mistakes lol
@annana When measuring something, you get the spots you know for sure plus an estimated spot. So since it is marked every tenth of a mL, you need to estimate each value to the hundredth place. Then when you subtract, the rule is least # of spots of the decimal for sig figs subtraction, so both #'s have two spots after the decimal.
There were some old multiple choice questions that showed this concept of going out one additional “nongiven” spot when measuring values from a buret (or ruler, etc).
@APChemTeacher crap, there goes that 5 :,) thanks though
@annana I don’t worry too much about students getting a 4 or a 5. Most colleges will give you atleast a semester of credit for a 4, and I recommend to most of my students (mostly Juniors) to get out of first semester in college if they can, but to take 2nd semester even if they can opt out of it.
My rationale for that is that you don’t want to go from your Junior year of HS in APChem to your sophomore year in college (Organic) without some chemistry refresher in there. Get out of first semester, but take 2nd semester no matter what. (and it should be an easy grade that way in college before the nightmare that is Orgo)
@ChessKing10 Of course! Putting it in water. God I feel like such an idiot. I put some BS down for that one like seeing if it precipitates with something or whatever… oh well.