<p>I don't think they would give you that limestone problem without a calc. Was that on the FR? You get a calc on that section.</p>
<p>EDIT: I see that calc was allowed back then. The answer to the rewritten problem is 80%.</p>
<p>paramagnetic means that it has unpaired electrons, thus allowing it to attract magnetic fields. you can figure out if something is paramagnetic by drawing the molecular orbital diagram and seeing if there are unpaired electrons.</p>
<p>some examples are B2 and O2</p>
<p>about the limestone. that was on multiple choice but as gfaith says above, apparently calculators were allowed on 1994 multiple choices so that explains it.</p>
<p>In 1996, when they decided that calculators wouldn't be allowed anymore, they took 10 of the 20 quantitative questions from the 1994 exam and rewrote them in noncalculator format so people could see what they would look like. The limestone question was one of them.</p>
<p>Did you mean Br2?
Also, how come Ca is not paramagnetic. It has a lone pair.
Is it related to the natural/standard state?</p>
<p>I would personally not waste my time remembering the molecular orbital diagrams. There is usually 1 or 2 questions about it at most. Just remember that B2 and O2 are paramagnetic and the other p-elements in that row are diamagnetic. If it asks for a paramagnetism, and B2 and O2 are absent, then go by trend and choose the thing right below it.</p>
<p>EDIT:
@austin</p>
<p>No, he meant B2 and O2.</p>
<p>Yeah, I agree.</p>
<p>I have to review labs because of the FR sections.
Which ones out of these can I skip(takes 20-30 mins to review each)?
1. Separation and Qualitative Analysis of Cations and Anions
2. Synthesis of a Coordination Compound and Its Chemical Analysis
3. Colorimetric or Spectrophotometric Analysis
4. Analytical Gravimetric Determination
5. Separation by Chromatography
6. Determination of Electrochemical Series
7. Measuments Using Electrochemical Cells and Electroplating</p>
<p>I would not skip electrochemistry labs. There is definitely going to be one on that. What could chromatography ask you other than different things adsorb differently. </p>
<p>I suspect they'll throw in a problem with beer's law: A =abc where A=absorbance, a= molar absorptivity constant, b=path length(distance lgiht travels through solution), and c= concentration of solution.</p>
<p>They will give you all values but c and ask for c probably.</p>
<p>WTH is Analytical gravimetric determination?</p>
<p>
[quote]
Yeah, I agree.</p>
<p>I have to review labs because of the FR sections.
Which ones out of these can I skip(takes 20-30 mins to review each)?
1. Separation and Qualitative Analysis of Cations and Anions
2. Synthesis of a Coordination Compound and Its Chemical Analysis
3. Colorimetric or Spectrophotometric Analysis DO NOT SKIP
4. Analytical Gravimetric Determination
5. Separation by Chromatography DO NOT SKIP
6. Determination of Electrochemical Series DO NOT SKIP
7. Measuments Using Electrochemical Cells and Electroplating DO NOT SKIP
[/quote]
</p>
<p>I don't know which to skip, but I am sure those are the ones to NOT skip.</p>
<p>
[quote]
Did you mean Br2?
Also, how come Ca is not paramagnetic. It has a lone pair.
Is it related to the natural/standard state?
[/quote]
</p>
<p>Paramagnetism means that it has unpaired electrons in an orbital. Do the electron configuration for Ca metal, all it's orbitals are filled; there are no unpaired electrons.</p>
<p>
[quote]
someone explain dipole dipole and london dispersion. those terms confuse me.
[/quote]
Dipole-dipole is a permanent dipole where the molecule is not symmetrical, and there is a strongly electronegative atom pulling all electrons to itself.</p>
<p>London dispersion is instantaneous. By random chance, electrons get pulled toward one side of a molecule.</p>
<p>"Gravimetric analysis" is a fancy name for measuring by weighing. The limestone problem is gravimetric analysis.</p>
<p>Analytical Gravimetric analysis is a method for determining the amount of a given substance in a solution by precipitation, filtration, drying, and weighing.</p>
<p>So you guys recommend that I do all of them?
Or just the ones that are related to electrochemistry and those that wxmann recommended.</p>
<p>Guys, the problem is I am using a book to review for these labs, and our teacher hasn't done any but 2 labs the whole year. So it takes a lot of time to understand the concept and how everything works.</p>
<p>afruff23, do you mind giving me a synopsis of Chromatography? Never done that in class.</p>
<p>Dipole occurs at EN difference of 0.3 to 1.7 I believe (I'm not sure of the 1.7 part).</p>
<p>EDIT: We never did chromatography either. <em>shrug</em> My PR book says nothing about it other than what I already said about differing adsorptions.</p>
<p>We did chromatography, but I didn't get it at all... all I remember is that you separate the components of a mixture by their differing polarities</p>
<p>So,
group 1 is parametric, so are groups 3-7. Becase group 1 (alkali metals) have an unpaired electron is the s orbital and 3-7 have unpaired electrons in the p orbital.
Am I right?</p>
<p>Yes, that is correct.</p>
<p>oh, that was easy. Thanks a lot!</p>
<p>Anybody happen to have MC 1999, I don't get 25 on it. I would type it out but the problem is that a curve/graph goes along with it.</p>
<p>A steady current of 10 mperes is passed through an aluminum-production cell for 15 minutes. Which of the following is the correct expression for calculating the number of grams of aluminum produced? (1 faraday = 96500 coulombs)
So this how we do it?
15minutes, convert it to seconds
15 times 60=900 secs times (10C/sec) times (1 mole e-/96500C) times (3 moles e-)
so ((15)(60)(10)(3))/96500</p>
<p>But that's not one of the answer choice, could somebody help?</p>
<p>Is knowing PR, reading + rereading it enough to get a 4/5? I've been taking practice tests from other books and not doing so well...</p>
<p>On the cooling curve, the plateau is the place of equilibrium between two phases. I would've chosen RS if it gave me the choice, but C is the next best answer. I never really understood the whole dip before plateau thing. Can somebody else explain it to me?</p>