<p>^That’s actually a viable answer. I said that the drilling for natural gas (i.e. hydrocarbons) was environmentally unfriendly (could pollute the water table, could destroy carbon sinks by taking out forests) while H2 can be obtained safely by electrolysis of seawater.</p>
<p>And writing all that screwed me on time for #2 b) and c). -___-</p>
<p>@GM2009- I said the rate law was just rate=k since the concentration of ethanol is one…
My teacher hasn’t given us our inserts back yet. Can somebody tell me what the second rxn question was? (4-b)</p>
<p>^It’s online. I’m too lazy to check, so this is what I remember (someone correct me if they know I’m wrong):</p>
<p>Cobalt (II) nitrate added to excess hydrochloric acid, forming a coordinate complex.</p>
<p>Follow-up: Which species acts as a Lewis base?</p>
<p>Answer: Co2+ + 4Cl- –>[CoCl4]2-
Follow-up answer: Cl-</p>
<p>Ah, do you get the reactant points if you messed up both the reactants and products?
Do they dock you off twice for that?
I wrote something stupid like Co2+ + H+ + Cl- —> [Co(HCl)2]4+
I balanced it properly though. Do I just get the balancing point?</p>
<p>For the combustion of butane one, I said that the CO2 gas reacts in the atmosphere with water to form acidic rain</p>
<p>Guys I think we all did much better than previously thought lol. At worse I got 45/75 points. On the 2008 practice I got 36/75 (worse…how? Idk) and I still received a 5. I’m hoping to pull off a 5 on this one! 
My AP Chemistey teacher would be so proud!</p>
<p>AP Chemistry**</p>
<p>On the two released practice exams I’ve taken in the past, I got 59/75 on one multiple choice and 72/75 on the second one. Let’s say I got the 59/75. What percent would I need on free response for a 5 do you think?</p>
<p>^ - go to AP Pass (Google it)
Ok so for the Hydrazine question:
<p>So I know I got points off got #1… will I get the points for 2 though?
Also, any chances of points for 3?</p>
<p>@ Abrayo - it’s always one point for the reactants, 2 points for the products, 1 point for balanced mass/charge.</p>
<p>EDIT: Looking over this I did a lot better than I thought I did.
The first FRQ just made me sad I think.</p>
<p>For some reason it’s not letting me edit my above post…
But have you guys SEEN Form B? Especially predicting reactions.
Every one of those was obvious.</p>
<p>Hope it’s okay that this is off topic, it’s more for SAT Chem but that place is always dead.</p>
<p>What’s the difference between square planar and trigonal bipyramidal? They both have 5 bonds, so I can’t tell. I mean, I know the different structures, but how can you tell which shape a molecule is if they both have 5 bonds?</p>
<p>And is the hybridization for NH3 sp3? i.e. do lone pairs contribute?</p>
<p>
</p>
<p>…</p>
<p>^ What?
. . . is that not correct?</p>
<p>Yeah it’s right. Carbonic Acid.</p>
<p>Good cuz I wasn’t even thinking about global warming on the test. But I hadn’t heard anyone say it’d form H2CO3 so I just wanted to make sure I wasn’t going crazy</p>
<p>H2O and CO2 make H2CO3 (and vice versa). Most people I know talked about CO2 being a greenhouse gas and global warming. I discussed how obtaining natural gas (i.e. hydrocarbons) was more environmentally unfriendly than obtaining H2.</p>
<p>I think I wrote about both acid rain and greenhouse gases.</p>
<p>Does the solubility of a solid increase with more pressure, and decrease with less pressure?</p>
<p>@Abrayo
Square planar has five bonds and one lone pair. Trigonal bipyramidal has five bonds and no lone pairs.</p>
<p>And yes lone pairs contribute to hybridization. </p>
<p>I don’t think pressure affects the solubility of a solid?</p>
<p>Thanks for your answers.</p>
<p>When I said ‘solid’ I meant a salt, ex. NaCl, sorry about that.</p>
<p>No that answer is not correct. Carbonic acid may be an acid but it is highly unstable and will form water and carbon dioxide instantly without being held high pressure or low temperature. (Carbonic acid is used in soda drinks and if you notice that once you open the can, it will automatically from carbon dioxide and your soda tastes “flat” because of the water diluting the flavor of soda. The correct answer is that carbon dioxide is a greenhouse gas as it traps heat in the Earths atmosphere.</p>