<p>i already did this one during spring break so will let others try it. by the way tryingmybest if you get like 70% on the m/c you are probably looking at a 5</p>
<p>you forgot to include that the [OH-] = 5.60E-4 M</p>
<p>Does anyone know the cutoff for getting a 5. I took a practice test (PR) and got a raw score of 108.5. Is that a 5 or is that a 4...also, by how much?</p>
<p>107-160....5
85-106......4
61-84.......3
42-60.......2
0-41........1</p>
<p>from the AP Chem 2002 Scoring Guide</p>
<p>Yikes...the last test i took is a borderline 5...and the one before that is high 4</p>
<p>Arrange the following from having the least boiling point to the greatest boiling point and justify:</p>
<ol>
<li>Li, Na, K</li>
<li>Ar, He, Ne</li>
<li>BeO, NaI, KCl</li>
</ol>
<p>^don't u go by the ionization or something??</p>
<ol>
<li>Smaller Atom= higher boiling point (nature of metallic bonds) </li>
<li>More electrons= higher boiling point (stronger London dispersion)</li>
<li>?</li>
</ol>
<p>what % on the M.C. should "guarantee" a 5? i'm averaging like 60% on practice tests arrgh. but i got 90% on a mock ap exam (with some luck involved..well ok lots of luck).</p>
<p>On my practice test graded like a real exam, I only got 46 right with 8 omits and 21 wrong. However, I did really well on part III to pull me into the 5 range. You should have 50 raw score points if you're even across the board on all parts. My parts I and II were barely 4-level scores, but I did so well on part III that I was launched into the 5 range.</p>
<p>for 3:
highest boiling point=BeO, cuz it has +2 and -2 charges.
second highest=KCl, cuz it has the same charges as NaI, but (I think) smaller molecules so they get closer
lowest=NaI</p>
<p>No doubt in my mind that NaCl has a higher boiling point than KI, but what about NaI and KCl?</p>
<p>Na+ is smaller than K+, but I- is larger than Cl-.</p>
<p>I'd go with NaI for a higher boiling point because Cl has a higher electronegativity which means it'll be harder to dissociate into solution. Definitely not sure on that one though.</p>
<p>I dont think such a problem would be on the actual test because there is not a definite and clear answer, one could argue both ways (espcially for the NaI and KCl ones)...Sorry for the confusion guys :-)
p.s. but i do believe MADEINUSA has got it for #3</p>
<p>that question up there is from PR - test 2, isn't it?</p>
<p>i got high 4 on that., mc. i'm worried, because i'm bound to flunk part II, and i want a 5</p>
<p>Yeah...I thought I saw that question today...I think I got it wrong.</p>
<p>high on life 76: which questions did you get wrong? I just took the practice test a few hours ago.</p>
<p>Yes, highonlife, but i didnt have the book in front of me, and so i recalled the question, but parts of it were wrong</p>
<p>Btw, I still wanted to know what the curve was for this test: like for getting each score 5....4...3...for example like What score you would get for MC and the corresponding average FR score to get a 5</p>
<p>so how do u determine which has a higher boiling point or a lower freezing point? i never went through this before, or i was just sleeping when my teacher went over this.</p>
<p>alright guys i'm back.... AP physics was a *****.</p>
<p>post some questions, let me slap some answers down.</p>
<p>feelin very confident for this test --> we took a practice test, I got 58 right on the MC, 12 wrong, 5 omitted....... = domination....... plus my FR's were good enough for a solid 5.</p>
<p>i have several questions,</p>
<p>for an ideal gas, i know that the kinetic molecular theory predicts that any collisions between molecules are elastic, but what about collisions with the container, are they elastic too?</p>
<p>are these soluble: Cr2O7, Cr2O4, MnO4?</p>