<p>what did you guys get for the molarity of propanoic acid question 2 part d</p>
<p>@Chimp22
FRQ 2 Part D:
At the end point, the acid and base are at the equivalence point, so the moles of acid is equal to the moles of base. Therefore:
M1V1 = M2V2
25<em>X = 20.52</em>.173
X = (20.52*.173)/(25)
X = 0.1419984 mol/L</p>
<p>@MoonMax I said the same thing except they formed group number - 1 compounds</p>
<p>@TheClassyCuber that’s what I would have written on the test. I wrote that explanation just now without looking at the periodic table and I specifically remember triple checking the table during the test.</p>
<p>im thinking i got a i got a 35-37/46 on the 2 part and 48-50 on the MC am i in 5 range?</p>
<p>Does anyone know when the answers to the free response come out? What did you guys say for 3d.</p>
<p>Cell potential is the same, but the less molar conc will last a shorter amount of time.</p>
<p>@terrytao The MC answers don’t come out unless the entire exam itself is released for sale by the Collegeboard.</p>
<p>Also, did you guys put yes or no for 3D about the use of a different indicator?</p>
<p>I mean, when do the scoring guidelines for the frqs come out? I’m pretty sure you don’t need another indicator as pKa is basically the same. </p>
<p>Someone commented earlier that the scoring guidelines are released at the same time as the test scores. I believe the reason for this is because they actually have a contact listed somewhere I saw earlier for if you feel that a test question was wrong (as in, did not fit the topics they have listed in their test specs - publicly available). If they do receive information about this, they would update the scoring guidelines and everyone’s score.</p>
<p>Any predictions about what the percentage for a 5 on the FRQ would be?</p>
<p>For number 6 of the FRQ, that asked about those really complex polymers propene and PVC, part a asked which of the beads will sink. What did you guys say and with what justification?</p>
<p>@geobro10 I put PVC, because Cl has more mass and contributes to a large density.
I kind of bsed that one =/</p>
<p>@geobro10 PVC… D= m/V, PVC had a higher molar mass because of the -Cl instead of -CH3</p>
<p><a href=“http://www.pvc.org/en/p/specific-gravity-density”>http://www.pvc.org/en/p/specific-gravity-density</a> <—</p>
<p>:-< </p>
<p>If i just said PVC was heavier would I get the point? I was running out of time and the word density/molar mass totally slipped my mind :(</p>
<p>@jy2013 I believe (speculation) that to get the point you only needed to compare the two compounds masses and say that the heaviest one will sink.</p>
<p>@jy2013 You probably wouldn’t because density is the defining reason why it will sink/float, sorry. @Kouren @Wskimo I did the same and if that part is worth 2 points, you will get 1 for the part about the density. However some are only worth 1 point and require the proper answer and explanation to get it.
I put pretty much the same thing and I don’t know if I’ll get the point/all of them because I didn’t have time to calculate density. Also I didn’t say the chlorine made it more dense because of the weight I just said it was more dense than water and the other thing.</p>
<p>For questopn 3.c) did we have to draw the bonds in the molecules?</p>
<p>Also what was the net ionic for the last part of number 3?</p>
<p>@acttest lol no you just had to show what molecules were moving where. idk about the net ionic.</p>