May 2013 SAT II Chemistry

<p>I guess I did ask that question! Sorry ddlk. I did put that answer, I must have guessed C on some other problem near the end.</p>

<p>@2redpartyhats</p>

<p>I had S2O3 for that (if we’re thinking about the same question).</p>

<p>oh your right, because it decomposes in diatomic oxygen.</p>

<p>Wait we may not be thinking about the same question. </p>

<p>My answer S2O3 was for the question about an 8g gas sample with 4.8g oxygen or something like that.</p>

<p>Actually I got that one wrong; it should be SO3 :x</p>

<p>wow collegeboard made different test forms then…because my form asked 8g gas sample with 3.2g of sulfur</p>

<p>could someone please explain the N2 and H2 gases mixed in 2L container pressure question? i put 8 atm. thanks!</p>

<p>@shocho that’s the same thing 3.2g sulfur + 4.8g oxygen = 8g sample</p>

<p>anyone else?</p>

<p>On the question about how many electrons the oxygen lost in KClO3 -> O2(g) + KCl</p>

<p>Was it as simple as 2 electrons since the oxidation state for O is -2? I think I chose 0 for some reason… lol.</p>

<p>i gas was contained in a 1 L system and its pressure was 4 atm
the other was contained in a 4L with a pressure of 1atm</p>

<p>PV=nRT where RT is constant so PV=n and youll see that there are equal moles of N2 and H2 so the new pressure would be P=n/V or P=8moles/2L = 4atm</p>

<p>yeah each O atom loses 2 electrons in the redox equation</p>

<p>the answers were SO3 NOT S2O3 because u divide by the molar mass of the oxygen atom not the molar mass of the o2 molecule</p>

<p>also there was 780 atom because you add it to 750</p>

<p>Well -2 so far. Any ideas on the curve for this one?</p>

<p>Definitely SO3.
For the one that was NOT a redox reaction, I put Silver Chloride + Copper Sulfate or something, because boiling alcohol isn’t a chemical reaction at all, and I thought none of the others were redox. Am i right?</p>

<p>i heard May subjects “usually” have a decent curve… but i wouldn’t expect much from collegeboard</p>

<p>yeah i had that one two fleet1x and you’re right</p>

<p>Yeah I had AgCl + CuSO4 since all of the elements retain their oxidation states.</p>

<p>@fleet1x …wait which one wasn’t a redox?</p>

<p>BROMINE IS A RED LIQUID @STP YEAH whatta bro</p>