The AP Chemistry Study Thread

<p>you get -1/4 per question wrong on the MC, no penalty on the FR section.</p>

<p>last year's FRQ #1 was awesome...I think it was easier than '04's, but neither were that bad. Both years' Form Bs seem a little more difficult than Form A's, but this is only IMO.</p>

<p>precocious~ you know that putting stuff in your calculator is cheating</p>

<p>do you guys think you are ready for the test? I feel pretty good. I did quite well on the PR practice test but I am afraid that I will forget everything come exam time</p>

<p>lol it doens't matter, you can only use it for the 2 problems anyway, for which that stuff will help very little..why waste your time :)?</p>

<p>The main thing I'm worried about is the free response questions. It seems like all luck for me b/c sometime I get all the points on a question and sometimes i get lost half way through and lose about half od the points.</p>

<p>I hope I dont make stupid mistakes like forgetting subscripts on the rxns!</p>

<p>Is it possible for the first problem to be about buffers or is it strictly equilibrium?</p>

<p>I should be good for FR, except for maybe FRQ #1...if it's something I can easily do I'm set. If it's not, idk how good my FR section will be :(...MC will probably be in the 50s</p>

<p>I'm so not ready......Arggggg.</p>

<p>if the first problem had buffers in it it'd only be one part of it (probably 2 points).</p>

<p>So, what score is everyone predicting on the exam tomorrow (although this will probably change after tomorrow morning)? I'm feeling like a 4, but it'll depend on the FRQs, etc.</p>

<p>some more last min studying for you guys to do: </p>

<p><a href="http://www.adriandingleschemistrypages.com/aplabsummary.pdf%5B/url%5D"&gt;http://www.adriandingleschemistrypages.com/aplabsummary.pdf&lt;/a&gt;&lt;/p>

<p>all the labs we're supposed to have done, for question #5 =) just do a quick read and you should be good</p>

<p>i really, REALLY want a 5 tomorrow... my chem teacher is famous for getting at least 75% of his students get 5's, and i wanna make him proud :) especially because he wrote me a fantastic rec for my summer program that made me feel all fuzzy instead, lmao</p>

<p>but i'll be content with a 4, possible 3.</p>

<p>does ap chem have a ridiculously huge curve like physics c?</p>

<p>i know you can get a 50-55% on the physics c exams and get a 5.</p>

<p>how well do you have to do on ap chem to get a 5 (usually)</p>

<p>little bit over 60% ;)</p>

<p>good to hear.</p>

<p>Maybe this has been asked/answered before, but I don't want to look back 20 pages soo...</p>

<p>Is it in any way possible to have complex ion equilibria on there? Because I really, really, really, really, REALLY don't want to learn that stuff...</p>

<ol>
<li><p>Commercial vinegar was titrated with NaOH solution to determine the content of acetic acid, HC2H3O2. For 20.0 milliliters of the vinegar 26.7 milliliters of 0.600-molar NaOH solution was required. What was the concentration of acetic acid in the vinegar if no other acid was present?</p>

<p>(A) 1.60 M
(B) 0.800 M
(C) 0.600 M
(D) 0.450 M
(E) 0.200 M</p></li>
</ol>

<p>we want equivalence point. set moles of each equal to each other:</p>

<p>(.0267L)(.600 M) = (.0200L)(concentration of acetic acid).</p>

<p>concentration of acetic acid is .800 molar. (B)</p>

<p>B?</p>

<p>(20 mL)(x) = (26.7 mL)(.6 M)
x = ~ .801...</p>

<ol>
<li>In a qualitative analysis for the presence of Pb2+, Fe2+, and Cu2+ ions in an aqueous solution, which of the following will allow the separation of Pb2+ from the other ions at room temp?</li>
</ol>

<p>(A) adding dilate Na2S(aq) solution
(B) adding dilute HCL(aq) solution
(C) adding dilute NaOH(aq) "
(D) adding dilute NH3(aq) "
(E) adding dilute HNO3(aq) "</p>