I don’t think that order matters, I was actually taught the opposite
@Ninjadu yeah, I would think they would then calculate the % yield you should have gotten with your wrong answer and give you the point if it’s correct.
I remember my teacher saying they were close in size but she always taught that 3d10 was bigger than 4s2… weird. I’m glad that doesn’t matter though, since I believe I put 4s2 3d10 for my order in that electron configuration part.
Oh shoot also on 6b I think it was, was it necessary to show the hydrolysis equation in equilibrium? I think I put a single arrow…
Here’s what I came up with for answers; I’m pretty sure they’re all right.
@Ninjadu I did the same exact thing with calculating the number of moles that were actually used or something like that. A minor calculation error. By partial credit, it means that he grader would probably just dock off 1 or 2 points for getting the number wrong (depending on if you got either or both wrong), but you’d still get full credit for your percent yield. Of course, the grader would have to plug it into their calculator to check its accuracy, and they would be really really pissed at you, but yes they give you partial credit.
For the bond angle, will AP accept a range or a specific number? The Oxygen had 2 unshared pairs of electrons so the bond angle would be smaller than 109.5. I just put in 106.
Also, will i get marked down if i drew in lines to represent bond angles rather than actual electrons?
Shouldn’t there be two more pairs of electrons on the oxygen for the lewis structure? 20 total electrons?
Though I did just google it and found both of those answers
Are you sure the Ksp one is right? Instead of an ice table I just set ksp=(.1)*4x^2 and solved for x I got a different answer.
Your ICE table is factoring your solid into account when it’s not supposed to because it’s in equilibrium and solids are not factored in…
And besides, it’s your Ca2+ ions that are initially .1 M because you are putting the substance in a solvent full of Ca2+ ions.
Oh crap I did! Yeah, definitely shouldn’t incorporate that into the equilibrium!
I completely read the question wrong; did this in a hurry earlier this afternoon.
Also is the wavelength supposed to be decreased to 400nm then? That’s what I put but I assumed I got it wrong because I thought I got my spectrum flipped and red wavelength should be raised. Is it switched for a spectrophotometer?
Yeah thats what I did for Ksp problem too and I’m pretty sure thats the correcy way. Ksp=[.1][2x]^2
Also, I’m pretty sure drawing lines instead of the actual electrons should be fine. Realizing how well I could’ve done on the FR if I wasn’t mentally challenged at reading and interpreting the questions and time management, and by time management, not wasting 25 minutes debating whether to draw a sudden dip on the tiration curve rather than focus on other problems I could’ve done better on.
I don’t think you have to include the specific wavelength, atleast I hope you don’t… I just talked about how you need to change the wavelength due to difference in color
AP doesn’t really care whether you put in a specific wavelength. They usually just care if you just recognized that the wavelength needs to be changed. However, I would say that it needs to be higher than for the blue indicator because red is a higher wavelength than blue, so you would need to calibrate it to a higher wavelength so that it can read red wavelengths, so I don’t think 400 fits the bill.
And btw, I’m in IB SL Chemistry and I self-studied for this test, so for things like absorbance, I had to simply guess XD
The dye is red, so it reflects red light. You want to plot absorbance in a part of the spectrum that’s actually absorbed.
Would you get points for an FRQ question if you gave a wrong answer but gave a…bareeeeeelllyyyyy reasonable justification?
@Dorfdude8 thanks! But the thing is I specified the wavelength should be decreased. Will they still give me the point?
I think it may be 400 because blue’s wavelength is around 400/500 but the wavelength was set to 635nm in the problem so maybe it doesn’t correlate
@Newdle really depends on your grader. Pray you get a really generous grader X)