Official 2011 AP Chemistry Thread

Test Preparation AP Sciences
721

<p>ty for 2008 exam. still looking for 2002. please pm me on cc or via yahoo.</p>

722

<p>wow the 2008 exam is pretty easy(well the first few questions).</p>

<p>my chem teacher posted an actual test i guess from collegeboard( i think he got it from the collegeboard online store). which was semi-challenging</p>

723

<p>Yeah I was really pleasantly surprised by how easy it was as well.
(Except when I forgot which charge are anions and which are cations… :frowning: )
Tell us how you did once you finish.</p>

724

<p>4khaos: Well I did an unknown year’s MC (my teacher photocopied it for us, but there isn’t a year) two weeks ago and got 93%, but then I took the 2002 (I think) for my final last weekend and got a 76% because of nerves (for me, that test counted more than tomorrow’s), but now I already have that experience and know what the time limit feels like, so I think I’ll do closer to my score at home.</p>

725

<p>Is there an answer key for the 2008 exam?</p>

726

<p>chaosdog - I posted it one the past page.</p>

727

<p>It’s this:
<a href=“Supporting Students from Day One to Exam Day – AP Central | College Board”>Supporting Students from Day One to Exam Day – AP Central | College Board;

728

<p>I love you guys</p>

729

<p>question:</p>

<p>what happens to dH when the combustion of C5H12(l) to form water (g)and carbon dioxide(g)</p>

730

<p>Combustion reactions of hydrocarbons are always negative dH, releasing energy. Think gasoline.</p>

731

<p>Quick hybridization question;</p>

<p>What is the hybridization of the carbon atoms in C2H2 (ethyne) and why?</p>

<p>Thanks.</p>

732

<p>^ I think they’re sp2 - there’s 2 singles and 1 triple.
I just associate that with sp2.</p>

733

<p>Remember, in combustion, heat is a product (it is exothermic) so the delta H would be negative.</p>

734

<p>Abrayo - what?
C2H2 is 1 single bond and 1 triple bond.</p>

735

<p>ty coffeeandtea</p>

736

<p>good luck everyone tomorrow! tonight I’m cramming like crazy</p>

737

<p>Does anyone know a good website explaining coordination complexes and complex ions?</p>

738

<p>how would u determine the oxidation state that is common to aq ions of Fe, Mn, and Zn with just hte ap chem periodic table?</p>

739

<p>supercuber, to my understanding u just look for something with an OH- or NH4 with a metal and that answer choice is ur answer.</p>

740

<p>I think you look at the standard reduction potentials in water solution at 25*C.</p>

<p>Fe -> Fe3+
Mn -> Mn2+
Zn -> Zn2+</p>

<p>I’m probably wrong someone needs to confirm.</p>

<p>Yes i was wrong, oxidation for any element is 0.
<a href=“http://www.science.uwaterloo.ca/~cchieh/cact/c123/oxidstat.html[/url]”>http://www.science.uwaterloo.ca/~cchieh/cact/c123/oxidstat.html&lt;/a&gt;&lt;/p&gt;