<p>Kerms, I must have put down the wrong answer on this thread-I recognize A,B,D,E as correct and the exact same as to what I put down.</p>
<p>Awesome :)</p>
<p>Ur right about ur 2c which is delta G, however you shouldn't of done</p>
<p>(-257)/(-.00821 X 298) on your calculator. You need to take into sig figs of the separate calculation : -.00821 X 298.</p>
<p>Aren't you supposed to use 8.31 for the constant R because it the answer has joules?</p>
<p>well i mean I used Kj. it doesn't really matter. You just will be 10^-3 different.</p>
<p>No, one is 831 and one would be 821, placed in that kind of calculation, the answers are drastically different.</p>
<p>Guys can someone answer these questions that have been asked a lot of times (still need answers though)</p>
<p>Ni(oh)2 VS Ni(oh) 2-</p>
<p>On number 5 the final one would saying "add h2so4 to dissolve naco3 but not caco3 work"?</p>
<p>On number 6 on the first two If, included with the OH bonding and Diple - Diope bonding I put Covalent bonding would they take off points?</p>
<p>Finally can someone tell me how much number 5 and 6 were (like the individual parts. I know that The first part of 5 was three points where you named compound x,y,z, but what about the rest. Thanks)</p>
<p>P.S. Can they take off points if you MISS a FrQ?</p>
<p>i'm a 100% sure that Ni(OH)2 is a product and not Ni(OH)4 2-. it didn't say excess, concentrated, etc. it is a precipitate reaction. i triple checked this b/c i missed a question like this on a rxn quiz we had in class.</p>
<p>adding H2SO4 would not work b/c both would dissolve in it. H2SO4 is a strong acid that dissociates 100% (or very close to it). the CO3 2- ions would be pulled off the naco3 and caco3 because it is a strong conjugate base and it would form H2CO3. this is true for both. the simplest test is just to put them in water and see which one dissolves.</p>
<p>they cannot take off points, they only count how many you get right and then they multiply by the scale which is posted on the 7th page. <a href="http://www.collegeboard.com/ap/pdf/aptechman_chem_3xbp.pdf%5B/url%5D">http://www.collegeboard.com/ap/pdf/aptechman_chem_3xbp.pdf</a> don't try to read through it b/c it's basically useless information.</p>
<p>Wait I am 100% sure that Caso4 would be a precip... check sol. rules if u dont believe me.</p>
<p>Um and Adding H2o would not work because for 1 reason. They are both Sol. in H2o (ca is "moderate" sol. in h2o whereas it is totally insol. in h2so4).</p>
<p>Does anyone know?</p>
<p>CaCO3 = not soluble in H2O........
I think it is Ni(OH)2</p>
<h1>5, the h2SO4 wouldn't do anything..... only difference is that both would bubble</h1>
<p>CaCO3 + H2SO4 --> H2O + CO2 + CaSO4
CaCO3 = same color as CaSO4, therefore it wouldn't look like ANYTHING was happening.</p>
<ol>
<li>not sure why you would put covalent bonding (don't even remember if that's a real intermolecular force......) i think that's more intramolecular...... so i think you'll miss that point.</li>
</ol>
<p>do they take off points if you miss the question? well...... duh. maybe i'm missing part of it or somethin, but yea, if you miss a FRQ you lose the whatever points you would've gotten for it.</p>
<p>They ask for intramolecular also, don't they?</p>
<p>oh if they did, I didn't put any :X</p>
<p>i didn't think they did...... might've though.</p>
<p>They will take off points per part wrong; if something is wrong that influenced all the other answers, only the part that is worng will be taken off, and you will be evaluated on whether or not you did the correct stuff with the wrong material. You will still get full credit if that is the case.</p>
<p>But wouldn't that differentiate if you added h2so4? One has a precip whereas one doesnt. ..?</p>
<p>Guys on question 2 B it asks for what are the molar concentrations of Pb 2+ and I -. Would they care if I wrote "They remain the same because change in vol of pBi2 has no effect on the molar concentration".</p>
<p>Oh and guys on number 7 was the second part </p>
<p>D2SP3
Square pyramidal</p>
<p>And also was the charge 4+?</p>
<p>gyros- if you added h2so4, it would be the same as if you added water.</p>
<p>one would be solid, one would be ions. you might not lose points but it's completely pointless.</p>
<ul>
<li><p>if you wrote exactly that, cept PbI2 (capitalized it wrong) then yea, you should be fine</p></li>
<li><p>i didn't do 7.</p></li>
</ul>
<p>1A metals have +1 as their oxidation number, always. Cs is a 1A metal.</p>