<p>@dipole… I agree but It’s also a sheilding/effective nuclear charge argument. Compare 4s vs 3d orbitals. The Repulsion argument is superceded because of the different orbitals and the diff in their energy levels. Zn+2 was my answer</p>
<p>could i still get a 5, with around 50-55 MC, and only messing up Q in the eq, correct Q but i mistakenly put that it was less than Ksp, and maybe the voltage increase with decrease concentration of Al3+ correct answer but incorrect explanation, and maybe small bits and parts of other explanations but nothing else major on the free response like electron configuration of Zn 2+ i forget what i put.</p>
<p>Is the consensus that Zn+2 has > ionization energy? I really thought it was Zn since it has a tighter hold on its valence e-s…I’ll ask my teacher on monday.</p>
<p>I completely messed up #1…teacher decided not to do ksp. I got around 35 points, 40 if they’re feeling generous w/ my work and explanations. If I get around 60% of mc right, where would that place me?</p>
<p>@glenny Yeah dude, you’re right. I think I missed it because I didn’t realize it was one of those wierd exceptions for the electron config. But yea that definitely supersedes the electron-electron repulsion! So final answer is Zn+2>Zn and for the reason Glenny posted.</p>
<p>darn. </p>
<p>If I had a chem rxn for #4 not net ionic, is that totally wrong? I know nitrates are soluble, but I didn’t feel comfortable putting just oh- + H+ –>H2O, so I put the whole equation…would I get partial credit, or no credit since I got no parts right?</p>
<p>@Beta_Fist…I agreed with you on Zn having a higher ionization energy…lol
I guess I still don’t know hahaha
I should have asked my teacher today…crap haha</p>
<p>hmmm I still disagree with people’s 4a
why would it be acidic???
The formula is correct H+ + OH- –> H2O
but how would it be acidic??
the concentration of the base…was double that of the acid
so going past the equivalence point…where both amounts are equal…it would be basic! not acidic</p>
<p>and you should make a 5 if you did that well on everything lol</p>
<p>cuz ur titrating a strong base with an acid, and u overshot the equivalence point</p>
<p>the base is being titrated, meaning they’re adding acid to it. if it’s past the equiv. point, then too much acid has been added, meaning the resulting solution is acidic, which is shown by the indicator turning yellow.</p>
<p>I know lol
exactly…
both are strong…so if you go past the equivalence point it’s a basic solution I thought</p>
<p>KNO3 and H2O are formed…you’re thinking in equilibrium terms. This isn’t in equilibrium. It’s pretty simple if you think about it…you have a base, you add too much acid so it’s not basic or neutral, so what is it? Acidic.</p>
<p>oh! ok I gotcha lol
I missed that point then… boo haha</p>
<p>No, it’s an acid past the equivalence point. Zn2+ has the higher ionization energy, by A LOT.</p>
<p>I wuold go on but I just checked the last page and saw that blizzardpenguin summed it up pretty nicely. I concur with him, because I got the exact same answers on all accounts.</p>
<p>Also, for k I believe it was 1.93x10-7.</p>
<p>well I was also thinking the acid was being added to the base…
LOL</p>
<p>I still don’t get the zinc question…but I don’t even care lol
I’m done with this thread now hahaha
I’m just gonna wait until July and see whether I passed or not :D</p>
<p>is getting a raw score of about 55-60 on the MC, but only getting half of the points on the free response enough to get a 5, or am i looking at a 3-4? i just screwed up terribly on the free response…</p>
<p>I’m form B, and god damn it, the FR paper came out, and I found that I missed a question (the last one)!!! I’m so unlucky, though it’s the truth. Anyone have an idea what the formula (raw score to grade) is this year?</p>
<p>65/75 MC , 75% FR
anybody have an idea if I have a chance to get a 5?</p>
<p>@takayu (#128 on page 9),
all your answers are correct (I am 100% sure), but for 3d, no it cannot be a single elementary step as the reaction coefficients are not the same as the reaction orders.</p>
<p>that day just wasnt a good day to take tests for me (i probably got a 14/28 on 1, 2, and 3, and a 6/8 on question 6); the mc i think i got like 8-12 wrong</p>
<p>can that be a 5?</p>
<hr>
<p>the grading is out of 160 (max)</p>
<p>multiple choice: 75 total points x (80/75) = 80 points (50% of test)
raw score for multiple choice is calculated by adding the number of questions you got right and subtracting from that number .25 x the number of mc wrong. You do not lose .25 off your raw score for leaving it blank, but you will lose 1 point for not getting that questions right.</p>
<p>short answer (50% of test):</p>
<p>Part A
1, 2, and 3 are out of 28 points (60% of short answer)
28 x (48/28) = 48 points </p>
<p>Part B
4 (reactions question) is out of 15 points (10% of short answer)
15 x (8/15) = 8 points
5 and 6 are out of 16 points (30% of short answer)
16 x (24/16) = 24 points</p>