<p>Well, here is the topics from Q1 within the last few years…
2010- Ksp
2010B-Kc/Kp
2011-Acid Base
2011B- Ksp
2012- Acid Base.</p>
<ul>
<li>I’m guessing we are going to get a Kc/Kp…I am praying we don’t get an acid-base lol.</li>
</ul>
<p>I am also goign to predict an electrochem question in questions 2 or 3, a complex ion question in Q4 and something to do with VSPER, trends and bonding in Q5-6. I hope we get something on bonding and lewis dots, etc, I am really good at those :P</p>
<p>One of my worries is that I will take too much time working out problems that involve decimals ;-;, it takes me a solid minute or two to solve a decimal division problem, especially in the case of calculating rate law. Hopefully if we get a reate law, it’s in Q2-Q3 :D</p>
<p>Aaaaahhh It’s tomorrow :O</p>
<p>Could anyone please do me the pleasure of explaining the Common Ion Effect with buffers and solubility. I’m so confused by it D:</p>
<p>is a dipole moment the same as dipole dipole attraction?</p>
<p>@elmo Yeah, it pretty much is. And please, can someone explain the common ion effect? I don’t get it either.</p>
<p>I believe the common ion effect pushes the reaction away whatever side the common ion is on. Say you have a mixture of AgNO3 and BaCl2. You would get a white AgCl precipitate. If you add in NaCl to this mixture. You will have less precipitate because of the common ion Cl- that will push the reaction back towards the reactants.</p>
<p>I took practice tests and did really bad on the multiple choice and did fairly well on the free-response questions. I expect nothing higher than a 3. I just really hope that kinetics isn’t the topic for one of the FR questions…</p>
<p>Really hoping bonding is going to be on it - love that stuff 
Electro and kinetics are strengths too so fingers crossed!</p>
<p>hey everybody, I’m totally new here and just starting, but I’m freaking about my AP Chem exam tomorrow, mostly about Redox reactions. I missed almost the entire unit and I’m still not really clear on them- especially using the reduction potentials chart, how to pick the best reducing/oxidizing agents, and how to predict the products of a reaction. If anyone can help and explain that, you’ll be my new bestest friend.</p>
<p>If someone could explain which K to use in the equation delta G = -RT * ln(K), that’d be great. It seems like it should be Kc, but when doing some official practice, the answer key was using the Kp value. Any clarifications on this?</p>
<p>Can anyone walk me through the weak acid-strong base titration process?</p>
<p>Can you post the question, Par?</p>
<p>Fix/Add on!
<p>I doubt Question 2 would be electrochem.</p>
<p>Speaking of electrochem and redox, somebody help explain it to me? I missed the entire unit of it in school…</p>
<p>I completely forgot how to do percent abundance. ahhhh Someone explain!</p>
<p>@lily I suggest you look up a powerpoint online. It’s an entire unit. </p>
<p>Percent abundance is a simple equation using x and 1-x. </p>
<p>For example, two naturally occurring isotopes of chlorine are 35Cl with a mass
of 34.9689 amu and 37Cl with a mass of 36.9659 amu. The atomic mass of
elemental chlorine on earth is found to be 35.46 amu. Calculate the percent abundance of each of the two chlorine isotopes.</p>
<p>34.9689X + 36.9659Y = 35.46 amu
34.9689X + 36.9659(1-X) = 35.46 amu
34.9689X + 36.9659 - 36.9659X = 35.46 amu
34.9689X - 36.9659X = 35.46 - 36.9659</p>
<p>X=75.6% -> Cl35
1-x=24.4% ->Cl37</p>
<p>I understand almost all of it, really. The only thing I don’t understand is oxidizing/reducing agents and predicting products. The rest of it I understand. I just want somebody to explain that part to me.</p>
<p>The oxidizing agent is what is reduced. The reducing agent is what is oxidized. </p>
<p>Predicting products? It would be like a regular reaction. Unless you don’t know how to set up the reaction and that’s what you need help on…</p>
<p>This will help you on predicting products:
<a href=“http://staffweb.psdschools.org/rjensen/apnotes/c17notes_zumdahl.doc[/url]”>http://staffweb.psdschools.org/rjensen/apnotes/c17notes_zumdahl.doc</a></p>
<p>Who can balance this half reaction? Ugh it’s impossible (it’s from the 2002 test)</p>
<p>… Cr2O72–(aq) + … . H2S(g) + … H+(aq) → … Cr3+(aq) + … S(s) + … H2O(l)</p>