<p>darn hydroxylamine 56 now. Don’t think many people would’ve gotten that though.</p>
<p>I’m confused by the date that finalists will be notified. The paperwork my S received from his coordinator says May 15th for finalists, May 22nd for top 150. I saw in this thread that there were 2 different links/dates. The ACS website kills my dialup connection so I’m not able to verify, but does anyone know “for sure” if the date for notification will be May 4th of 15th? IMO, May 15th makes more sense as it is 1 week before general announcement, not a week and a half. Finalists must respond “quickly” which will give ACS enough time to make sure they have a full 20 for camp… a week is long enough for that.</p>
<p>I don’t know for sure but I really think that’s the case.</p>
<p>@YT35 yes that was a tricky one. It’ll be one of those “anomalies.”</p>
<p>@HarveyMuddLove
That is true, but the atmosphere is mostly nitrogen and if you don’t heat the crucible long enough, you will get some magnesium nitride, which will introduce error.</p>
<p>hm idk if we should trust wikipedia >< here it says pkb for hydroxylamine is 7.97 [url=<a href=“http://www.science.uwaterloo.ca/~cchieh/cact/tools/pkb.html]Constants[/url”>http://www.science.uwaterloo.ca/~cchieh/cact/tools/pkb.html]Constants[/url</a>]</p>
<p>Moral of the story: don’t trust the wiki.
Restored to 58!!!</p>
<p>Other sources seem to have a value of ~8 too.</p>
<p>yay 57 again. lolz wikipedia - I have to say I didn’t believe it when I saw it.<br>
YT35 = U235</p>
<p>I guess the two lone pairs on the oxygen would actually only enhance nucleophilicity and not basicity then.
[Alpha</a> effect - Wikipedia, the free encyclopedia](<a href=“http://en.wikipedia.org/wiki/Alpha_effect]Alpha”>Alpha effect - Wikipedia)
Darn it. I didn’t notice that about your username…</p>
<p>lol why am I trusting wikipedia again?</p>
<p>The inorganic professor who administered our exam said later that the answer for the Magnesium Oxide EF was that magnesium peroxide also formed</p>
<p>Same, I asked my chem teacher about that one and he said magnesium peroxide is a possibility.</p>
<p>That’s wrong. No mixture of magnesium oxide and peroxide will have a mass % of magnesium equivalent to Mg5O4.</p>
<p>MgO - Mg5O5
MgO2 - Mg5O10</p>
<p>No possibility for Mg5O4.</p>
<p>I got 4 and 27 wrong. 56… Ack it keeps going down.</p>
<p>Yea, just assume that the experiment sucked and the only compound formed was magnesium peroxide… MgO2 no way you could get Mg > O.</p>
<p>On the other hand, assume the experiment sucked and you got all Mg3N2. You would calculate Mg3O2 (Mg>O), so Mg5O4 is possible.</p>
<p>Yeah, that’s how I thought about it: I separated the four answers into “too little Mg” or “too much Mg”. I don’t remember my answer though</p>
<p>Can you post the exact question? I can’t really remember the question</p>
<p>And I can’t remember if I chose magnesium nitride or peroxide lol</p>
<p>@barley what were 4 and 27? and 56 is still higher than 55 which is the average, don’t worry!</p>
<p>55 is average for only 2010, which was easier than this year’s so you’ve got a good chance</p>
<p>4 was copper nitrate. I didn’t see the ratio of NO : NO2 (2:3). 27 was an easy calculation of rate constant. I misread it (36.5% to completion. I thought 36.5% reactants left).</p>
<p>And btw, another one of their little tricks was on the C4H8 question. cis- and trans- 2-butene are different compounds, so there are 4 isomers (D).</p>
<p>That’s when memorizing how many isomers different stuff has comes in handy :)</p>
<p>Oh thank god I got that one. I was trying to decide if a geometric isomer counted as a different compound and decided 4 
I got 9 on the balancing copper one, anyone else?</p>
<p>Yeah, I got something that included coefficients where Copper was 4.5, so i multiplied it by 2 and got 9 (i think that was D?)</p>