<p>Can someone show me the question and why K is 1/min and not 1/sec. I'm pretty sure the rate in the table was per second. I could be wrong tho.</p>
<p>
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aren't london dispersion forces th weakest form of ionic bonding????
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</p>
<p>no, they aren't even close. London Dispersion forces have to do with gaseous molecules - sorta like weaker dipole-dipole moments. Ionic bonding involves the actual transfer of electrons from one atom to another (and then they are called ions) You're way off base with that analysis.</p>
<p>tm2000 - go to CB and look at the 2005 FR for chem. On FR three, the portion that involves the units of k has minutes in it. All of you are confusing parts a and b, which had seconds. But part c has a new chemical equation that has minutes in it.</p>
<p>aren't London forces merely electrons favoring the more electronegative side of a molecule over the other side?</p>
<p>But, wouldn't I be right in the 2nd part because NACl forms a crystalline lattic???</p>
<p>k was definitely 1/minutes</p>
<p>it has to be because the time was in minutes</p>
<p>Not enough information there; both molecules form crystalline lattice structures. Just merely stating that won't get credit. You definitely have to mention the lengths of the ionic bonds to even have the possibility of getting credit, and relating that to Coulomb's Law is the surest bet.</p>
<p>Crap, how do you think i did on the fr as a whole though?</p>
<p>No idea - go back in this thread and check all the previous answer posts and the confirmed answers. I'm pretty sure we've covered all the FR.</p>
<p>I was lucky I knew solubility rules. My lab instructor didn't really teach us anything, but I remembered AgCl was white, so Ag2S had to be the black one.</p>
<p>I think I did surprisingly decent on the ap test. I liked the flame test question the best. For N2 I wrote that the result would be a massive explosion causing cascading of Rainbow Skittles. I hope this counts.</p>
<p>yeah, actually that's wrong. The N2 would put the splint out. lol, not sure if you're trying to be funny there... lol</p>
<p>what? I've heard a lot of stuff on the board about N2 forming brown gas, i.e. NO2. Why would it put it out?</p>
<p>could anyone give the score breakdowns of each question on the fr along with the amount of points that each part of a question is worth? Also, when people say 60% gets a 5 on the ap chem exam, does that mean, overall if u get 6 out of every 10 points, you're going to get a 5, or is it 60% weighted? Anyone know the formula to figure out ur score?</p>
<p>FRs are 55% MC is 45%
MC is a pt for each right -1/4 for each wrong
FR
I posted this somewhere else can't find what I put down, but do a search you should find it.</p>
<p>I really hope it counts.</p>
<p><a href="http://img.sparknotes.com/content/testprep/pdf/apchemistry.pdf%5B/url%5D">http://img.sparknotes.com/content/testprep/pdf/apchemistry.pdf</a>
Grading Rubric...</p>
<p>The one for this exam should be very similar..</p>
<p>What was the correct answer to the question where it asked the make up of H20, it was potassium and Orangutan, right?</p>
<p>Almonds- that one stumped me for a bit but you're right- only it wasn't for water, it was the nitric acide one. Good luck!</p>
<p>Can someone please go through FR #8 with me? It seemed most people went for #7 -- a choice I respect -- but seriously, I'm sure somebody here knows something about #8.</p>
<p>Ok, this really has nothing to do with the ap exam but is chemistry-related: What is a pro-base and when is it used??? I'm stumped!</p>