<p>yea, i thinking core electrons wouldn’t change across the period, so just I and II</p>
<p>12, I’m not sure, would like clarification, I put D cuz you tryin to get to 0 K, so wouldn’t you want negative celsius measurements?</p>
<p>right now sitting at a 57…lol said i wouldnt come but its like inevitable that i come back to this thread</p>
<p>funny thing is i got perfect on organic last year, but only like 44 right, this year all the wrong ones in organic/last page</p>
<p>thanks guys!</p>
<p>here’s an answer key I made for the test: <a href=“https://docs.google.com/spreadsheet/ccc?key=0AhQfjO3cStz4dERFZnJBSmxmeWFCNi1YNlJ3M3h2Y1E&usp=sharing[/url]”>https://docs.google.com/spreadsheet/ccc?key=0AhQfjO3cStz4dERFZnJBSmxmeWFCNi1YNlJ3M3h2Y1E&usp=sharing</a>
[Chem</a> Olympiad - Imgur](<a href=“http://imgur.com/a/8X8AU]Chem”>Chem Olympiad - Album on Imgur)
could someone please make sure everything looks right?</p>
<p>also, is a 47 good enough for honors?</p>
<p>Yea I put D too for 12, but my friend insisted that it was A. I don’t think the atmospheric corrections are that important and it’s nice to be able to extrapolate less.
58-59 for me, lol, just hope that I didn’t do too badly on the FR and Lab.</p>
<p>the atmospheric corrections shouldn’t matter imo since they would occur for every data point (it’s like what we learn in AP Stats I think??). </p>
<p>silly mistake on the molecular bond order f me.</p>
<p>The cutoff in 2010 was 43, so you have a good shot at making honors</p>
<p>@universeis42: For #31, why is the answer A? For every choice except B, there is no change in the number of moles.</p>
<p>In Kp = Kc(RT)^n, n reflects the change in mol of gas. Liquids and solids are not included in the equilibrium constant, so their presence doesn’t matter.</p>
<p>12 - when you cool a gas, you change its pressure too. Since this is volume vs temperature, it’s an isobar: you want to keep pressure as constant as possible or at least have your numbers corrected to a standard pressure. If pressure changes too, it messes up your line and even if you had more points it wouldn’t matter.</p>
<p>Hello could someone post the part ii frqs?</p>
<p>@SciMathNerd </p>
<p>For 31, use Kp=Kc(RT)^delta n</p>
<p>RT is at 25 degrees Celsius and R is the ideal gas constant so RT=0.08206*298=24.5</p>
<p>So if delta n > 1, Kp > Kc. This is true only for choice A</p>
<p>yeah I would love you if you post FRQ (anyone?)</p>
<p>I think I did really good on lab 1 (less than 2% error for both Cu and Al), lab 2 ok but I didn’t get the compound, I only could get the correct order of unknowns to add.</p>
<p>~58 on MC, I think I got 88-91 on FRQ but dunno, stupid mistakes plague me a lot.
I will buy everyone cookies if I make camp</p>
<p>@universeis42: Shoot, thanks. I didn’t even realize that they weren’t all gases.</p>
<p>2% error wow…pretty sure i got >500% error on that part…</p>
<p>for 2nd part compound what was it? some vanadium thingy??</p>
<p>I THINK it was iodine…
You added a colorless solution of iodide into a oxidizing agent, which turns the solution brown. You then add the really viscous substance (which I think was starch), which forms a blue complex with iodine. Then you add a reducing agent which reduces I2 to once again form the colorless iodide ion.
LOL Sophia insists that it was some weird iron complex. I’m not sure either way.</p>
<p>I think it was vanadium. I put manganese; I don’t know why. :(</p>
<p>hmm well i think it could be multiple different compounds…</p>
<p>and sophia7x making camp with those stats danggg</p>
<p>i’m at a 45 +/- 2 (bad memory) >.<
does anyone think that the cut-off will be higher this year?</p>
<p>Also, is there a debate over number 12? Isn’t it supposed to have more data points near 0 K for better extrapolation? I mean, all the data points are at the same pressure so no need to normalize? And there would not be a point to normalizing since can’t we assume 1atm anyways?</p>
<p>Yeah I put permanganate for part 2 of lab 2. I DO think that it was oxidation-reduction since there were bubbles in the yellow solution. Everyone else in my testing center put acid base and thought it was an indicator, which I’m pretty sure is wrong.</p>
<p>I saw bubbles and put oxidation-reduction too. I am fairly sure it was oxidation-reduction, but I’m wrong a lot. :P</p>
<p>@ownzandy I looked at past exams and the MC seemed a little harder than average, or at least as hard. So I don’t think the cutoff will be higher this year (I sure hope it won’t).</p>