<p>Hey guys</p>
<p>how did you do on the chem test?</p>
<p>couple of questions</p>
<p>1)how do you saperate KI from iron and sand</p>
<p>sieve? or distillation?</p>
<p>2) what is not used in a dilute of acid.</p>
<p>nobody here took the chem test?</p>
<p>I said a sieve but I dont even know wut that is. I just took an educated guess.</p>
<p>1, water extraction
2, crucible</p>
<p>HiLine</p>
<p>I aggree with you on the 2nd one</p>
<p>and i put distillation for the 1st one, could you plz explain what water extraction is?</p>
<p>KI sublimes</p>
<p>ok…</p>
<p>what did you guys get for the last question?</p>
<p>was it 0.005(6.02)^23?</p>
<p>I don’t exactly remember the choice, but I thought it was the only one that could be right. The other choices did not seem reasonable to me.
Do you remember the numbers in the last questions ?</p>
<p>i don’t even know hwt the last qustion is…</p>
<p>sorry…</p>
<p>For the KI extraction thing I put sublimes…</p>
<p>i put sublimation as well but I’m not sure of it a bit</p>
<p>how come i rememer that the mixture contains not only KI, Fe, and sand, but also KCl? </p>
<p>If there’s no KCl, the answer would defintely be water extraction, since Fe and sand don’t dissolve. (magnet would only attract Fe, acid woud react with Fe but KI and sand would remain; sieve is kind of impossible since it can only roughly seperate something of different sizes)</p>
<p>could someone verify what the original mixture is? if there were KCl, water extraction can’t help anything at all since KCl and KI would both remain dissolved and the only choice left is sublimation. </p>
<p>btw, I checked Wiki and it said that KCl sublimes. The back-up information for picking sublimation is that Fe, KI (and KCl, if that’s the case) have different melting and boiling points. </p>
<p>ah…chem, physics is so easy. What kind of raw scores do you guys think could guarantee a 800 in chem? (though every book says 80) Is there fluctuations?</p>
<p>well, the offical guide says.it depends on how students do on each test,so it may fluctuate a little bit.</p>
<p>for the question, how come i remember the KI is in solution., if so it shoulod be sublimation, but if not so, i don’t konw then</p>
<p>what about the second last question</p>
<p>the Ka of the acid is what?</p>
<p>I don’t think there is KCl in the mixture.</p>
<p>and is KI in solution?</p>
<p>I don’t believe it mentioned it was in solution…all I remember it saying was there was sand, Fe, and KI in a mixture…I figured they’d all be in the solid state…so therefore I put sublimes because it should let the KI come out easily w/out taking out the Fe and sand…</p>
<p>////////
then i must be wrong. should be water extraction then.
sigh.</p>
<p>We can not do anything to change our result now. Let’s hope for the best.</p>
<p>lol, yeah.</p>
<p>i’ve just got a question
since this is my first time to take SAT and have no experience abour curve predictions whatsoever, i don’t get it why for physics u could get a perfect with skipping more than a dozen out of 75, whereas a chem perfect is about 80/85? do students performance in the two tests differ by this much? or it’s pre-set by test writers? or anything?</p>
<p>I believe Chem is supposed to be less hard.</p>