<p>So are we allowed to bring calculators or something? I hate division ;)</p>
<p>and did he post the answer key and take it away already? I remember him talking about it last wed, but I can't remember when he said it was going to be up....</p>
<p>i hope so .</p>
<p>anyone know if he’s going to put up the key for summer 2009?</p>
<p>for the TLC skeleton notes, how do we answer the last question?</p>
<p>is he going to post notes for the lectures online or is he not :/</p>
<p>wait… are we allowed to use our lab notebooks… for this? or do we have to memorize the molar mass for compounds… -.-</p>
<p>you get a periodic table.</p>
<p>molar mass. cmon guys. lol</p>
<p>for the TLC skeleton notes, how do we answer the last question? </p>
<p>which last one? carboline notes? </p>
<p>is he going to post notes for the lectures online or is he not 
</p>
<p>doubt it</p>
<p>wait… are we allowed to use our lab notebooks… for this? or do we have to memorize the molar mass for compounds… -.- </p>
<p>probably not…it’s not that bad, but if we don’t get a calculator (unlike the quizzes) i don’t want to screw up a simple division/multiplication…</p>
<p>lmao…1234, i said for the TLC skeleton notes…there’s a question about ID’ing different compounds but then a fourth dot pops out…</p>
<p>And no he’s not going to post notes for the lecture. I don’t think he does in the first place except for the two/three times that 1) he forgot to put skeleton notes and 2) he made some mistake in the previous lecture.</p>
<p>lol…i think i need hooked on phonics :D</p>
<p>oh good. you get periodic table. how come that wasn’t specified.</p>
<p>because nearly every legitimate chem test you take will provide you with one, at least in the LD classes? lol I don’t know.
ANother question, splitting tree: triplet of doublet example…did viernes just draw it weird? I thought a triplet, three lines was supposed to branch out from the initial line, but he draw it two then another two which overlapped into a triplet and then drew doublets from each of those…or do they just all come out to be the same?</p>
<p>but I think that it comes out the same…pedersen taught it a different way than viernes</p>
<p>Viernes’s lab final seems so easy compared to pedersen’s. Hey is reverse TLC the same as C_8 chromatography?</p>
<p>^yeah, I C8 is the stationary form instead of SiO2 in reverse phase chromatography</p>
<p>pedersen’s final wasn’t exactly difficult though…</p>
<p>the chem 3 lab portion has been pretty good…the pace, labs, questions, discussion…it was a pretty decent application of what we learned in lecture (more than other classes/labs at least)</p>
<p>wait if you increase solvent system polarity: SiO2 Rf increases and C8 Rf …?</p>
<p>decreases (10char)</p>
<p>This is confusing, spring09 exam question 4</p>
<p>Reverse phase chromatography - the more polar the solvent system, the slower it will elute? So if the mobile and stationary phases are more similar, the whole thing will just go faster?</p>
<p>so my understanding is that decrease polarity of solvent system, then Rf goes up for C4, C8, etc chromatography. Increase polarity of solvent system in a SiO2, then Rf values go up.
If they’re similar, then you’re running a bad tlc…i’d imagine the spots will not elute very well.</p>