There’s a lab FRQ?!
Sort of if you did the lab it’s based on you will be able to answer the question easily . You don’t have to design a lab though
We’ve done a whopping total of 0 labs this year. So screwed. Thanks, though!
How many of you guys are also taking AP Psychology on monday?
@APScholar18
The question about N and O was actually a question on the practice exam.
N’s 2p energy level has 3 half-filled suborbitals and O’s 2p energy level has 2 half-filled and 1 full suborbital. O has a lower IE because the highest-energy valence electron experiences repulsion from the other electron that it is paired with. This overcomes the fact that O is smaller.
Generally, I don’t think that the exam writers would ask for this without making it clear that it is an exception.
What are you guys scoring on the practice exams?
@APScholar18: I am. RIP to both of us :P. I also have to make up an AP Chem test after taking two AP tests :(.
@JuicyMango I have Calc AB the next day and AP Lit the day after that.
I am @APScholar @JuicyMango
I’m taking chem, psych, calc ab, apush and lang as a junior! Good luck to all
@baller55 I also have APUSH and Lang. It’s going to a hectic two weeks hopefully we all get 5’s!
Do you guys have and good documents or videos about titrations? I am confused on them.
What is the difference between the half equivalence point and the equivalence point?
Half equivelence is the point where half the volume of the titrant has been used.
Half of the volume at the equivalence point that is
@APScholar18 this was a good one https://www.youtube.com/watch?v=kOOOuny8G-o
just know equivalence point is where mols acid = mols base && all acid available has reacted with base to form h2o + salt along with its conjugate base
half-way equiv point can be found by halving the volume of titrant @ equiv point and it is where pH = pKa AND mols acid = mols conjugate base of the acid
between half way and equiv is when the conc. on conjugate base is >>> the acid
once you go past the equiv point, there will ONLY be conjugate base, and the base you’re adding in solution (so if you’re using NaOH you would have your conjugate base, OH- and Na ions in solution) *note that once you start leveling off after passing the equivalence point, the OH concentration is MUCH higher than the conjugate base concentration
if anyone else has anything to add feel free 
also does anyone know any good practice tests (besides the 2013 practice exam released for teachers) to work on?
No the trends are general. You want to think about the fact oxygen will have a paired shell which will increase the amount of repulsion. It is ok if there are exceptions to the “rule”
Can someone explain #17 on the practice test?
@APScholar18 - Are you talking about the 2014 test?
Yo, does anyone know if we need to know indicator chemistry? Like… Ka of HIn etc.?
@glasshours no I am talking about the 2013 practice exam of the new format not the actual 2014 exam
Also why does condensation occur at the lowest pressure for the gas with the strongest IMF’S?