<p>The last part of the second lab was pretty lame.</p>
<p>And when can we start discussing questions?</p>
<p>2nd part of the second lab was lame, and I think we can discuss now, I don’t think anybody in America is taking it at 6 oclock (or 7,8,9 oclock depending on where you live) on the last night.</p>
<p>My section doesn’t give us our packets back until next week. Could someone post the questions and answers so I can know whether I made the cutoff?</p>
<p>The test taking period isn’t even over; I don’t think anyone has answers or questions.</p>
<p>Hey guys so basically the answers to part 1 of the exam will be available online on April 27th?</p>
<p>@ justin</p>
<p>No, not necessary. They submitted the local exam much later than when they should have. So, I wouldn’t count on it. On the other hand, in the past, they have submitted camp results and the top 50/150 earlier than they said they would post it. So, just keep checking the website. But, give it at least a week or 10 days.</p>
<p>t_t the website says camp will come out in a month. I’ll stick to hoping that they grade as quickly as last year.</p>
<p>Yeah I hope so too!</p>
<p>Who here thinks they have a chance at camp?</p>
<p>bump on the question of whether the acs website is correct in saying top 150 comes before top 20, or if that’s just a typo?</p>
<p>Also is anyone familiar with how the FRQ is graded for partial credit? I’ve checked a number of my responses and I’ve found that while I got some of the first questions in #6 wrong, I had explained my logic clearly and used a number of correct assumptions. Would I still get each part completely wrong, or would I get some credit?</p>
<p>I think it’s safe to start discussing individual answers tomorrow on this thread, like the USABO thread usually does.</p>
<p>@thenerdyjew
lol we all hope that we have a chance at camp, but the 20 spots are still up for grabs considering how many of each year’s campers don’t post on cc, and as such it’s hard to estimate the actual cutoffs. This year’s cutoff should be depressed considering the difficulty of certain topics of the test, but if at least 20 people in the whole country knew how to answer those questions, then the notion of those questions depressing the cutoff score is invalid. (I personally hope most people who make camp didn’t answer those correctly, just so the cutoff score is a bit depressed :3)</p>
<p>Seeing how everyone did here on cc though (>53 MC and >80% of FRQ), I think a lot of cc’ers have a pretty damn good chance of making camp 
Hopefully some of us get a pleasant email in the next few weeks haha</p>
<p>ACS is so messed up in their dates on the website, just rely on last year honestly. </p>
<p>The FR gives partial credit, but I don’t know the specifics. I know that for #5, its 1 point if all the reactants are right, then 2 points if all the products are right, then they scale it to 12%.</p>
<p>The graders are told to be strict, from what I hear. :(</p>
<p>Anybody putting together a test/answer key tomorrow?</p>
<p>^ I will be getting my test booklets back soon</p>
<p>
</p>
<p>I wasn’t able to take the national exam though:/</p>
<p>@pandapwner</p>
<p>That’s okay. Still, making nationals is an accomplishment. If you have another year, keep studying and hopefully you will get the opportunity to take the exam and do well!</p>
<p>here’s a scanned copy of the test: [Chem</a> Olympiad - Imgur](<a href=“http://imgur.com/a/8X8AU]Chem”>Chem Olympiad - Album on Imgur)
let me know if there are anymore that are wrong</p>
<p>I think:</p>
<p>10) D
<a href=“Infrared spectroscopy - Wikipedia”>Infrared spectroscopy - Wikipedia;
Isotopes are different masses and give different IR Spectra</p>
<p>11) B
[Permanganate</a> - Wikipedia, the free encyclopedia<a href=“reduces%20by%201%20electron%20in%20basic%20solution”>/url</a></p>
<p>12) Not sure, probably A or D</p>
<p>15) B</p>
<p>18) D</p>
<p>19) C</p>
<p>30) B
ln (k2/k1) = Ea/R (1/T1 - 1/T2)
ln (k2/8.54e-4) = 10921(-2.11e-4)
k2/8.54e-4 = -10
k2 = 8.54e-5</p>
<p>31) A
Kp = Kc x (RT)^n
Say, if n = +1, Kp = Kc x 24.5
so Kp > Kc</p>
<p>32) B
K = (1.52)^2 x (1.52/2) / (2 x 0.24)^2</p>
<p>34) D
See structure of alanine at pH = 7 near bottom.
[url=<a href=“http://en.wikipedia.org/wiki/Alanine]Alanine”>Alanine - Wikipedia]Alanine</a> - Wikipedia, the free encyclopedia](<a href=“http://en.wikipedia.org/wiki/Permanganate]Permanganate”>Permanganate - Wikipedia)</p>
<p>38) B
E(reac) = E(red) - E(ox)
The easiest metal to oxidize is copper, and the substance must oxidize Cu and Cu only. So E(reac) must be + for copper and - for all other substances. V must be above .34 and below .8</p>
<p>45) Not sure, I put C, since the core electron shell never changes as you move right across the periodic table.</p>
<p>55) Not sure what you put there, but D</p>
<p>56) B
<a href=“http://wps.prenhall.com/wps/media/objects/724/741576/Instructor_Resources/Chapter_02/Text_Images/FG02_10.JPG[/url]”>http://wps.prenhall.com/wps/media/objects/724/741576/Instructor_Resources/Chapter_02/Text_Images/FG02_10.JPG</a></p>
![http://wps.prenhall.com/wps/media/objects/724/741576/Instructor_Resources/Chapter_02/Text_Images/FG02_10.JPG[/url]](http://wps.prenhall.com/wps/media/objects/724/741576/Instructor_Resources/Chapter_02/Text_Images/FG02_10.JPG%5B/url%5D){kind=link}
<p>wait for 30 aren’t you supposed to use kilojoules per mole for E_a?</p>
<p>EDIT: nevermind I think you’re right with using joules</p>
<p>Ea/R (1/T1 - 1/T2) must be unitless
(90800 J)/(8.314 J/K) x (1/318K - 1/298K)
= 10921 K x (-2.11e-4 K^-1)
= -2.304</p>
<p>Or you could use kJ for Ea, but then you’d have to use 0.008314 kJ/K for R</p>
<p>lol looks like I got 52/53 for the MC, about 50% on the FRQ and not so hot on the labs. Honors it looks like!</p>