<p>@PersianPwr yes the exam will be much more lab based than previous ones. I can send them to you if you want, PM me.</p>
<p>Wow that Barron’s Online Test thing is incredible, appears very similar to what Monday could be (lots of diagrams and concepts). I got 83% (exact same score as 2008 exam) on the MC. 76/102 on the entire exam, so a 5 on the old curves. :D</p>
<p>@kingofxbox99 Could you link that Barron’s Online Test thing?</p>
<p>Could you please send me a link of that Barron’s online test?? It would be super helpful!</p>
<h1>lookonpage24</h1>
<p>Whoops I overlooked that… :P</p>
<p>If anyone has a resource that can help out with the lab FRQ, can he or she please post it?</p>
<p>All I’m doing this weekend is looking over some harder topics, like thermodynamics and acid-base chemistry. I feel like I have so much more to study though. /:</p>
<p>@cxcharlie do you know the passwords for those pdfs?</p>
<p>What;s the link to the Barron’s online exam?</p>
<p>I’ve done 2 older practice exams and I got 85% on both the multiple choice. I just took one of the newer based ones and got 65%. This is not good.</p>
<p>I got a 70% on the barrons mc 
and I know I’m going to fail the frqs… </p>
<p>But looking over it I feel like I know all of it. Maybe I’m just freaking out too much. (this is the only time I’ll ever say I miss doing math without a calculator)</p>
<p>How many labs are there? Are they really important to know?</p>
<p>I know what you mean… I made a bunch of stupid mistakes, but there were about 5-7 questions I honestly didn’t know/understand… I think the reason I did so badly is that I have a subconscious feeling that this practice test doesn’t count, so I don’t pay as much attention to the questions. I hope I’m not just making excuses, but I still am freaking out. :(( </p>
<p>Can someone help me? How do you determine pH from pKa? </p>
<p>at the 1/2 equivalence point, ph=pka.
if ph<pka, there="" are="" more="" ha="" ions="" in="" the="" solution.="" if="" ph="">pka, there are more h+ and a- ions in the solution.</pka,></p>
<p>Fantastic! It makes sense too! Can someone explain titration to me though? I feel it it’s going to be on the test! Guys find a FRQ about titration and practice it! </p>
<p>By the way, does someone know how to get pKa to pKb?</p>
<p>I believe pka+pkb=14</p>
<p>Titration is a pretty simple topic to understand, but it confuses people once you get into buffers and math starts to be involved. A simple explanation of it would be that you’re attempting to neutralize a base by adding acid to it (or vise versa)</p>
<p>There are two main problems you will have to deal with:
Adding a strong acid to a strong base (or vise versa)</p>
<p>Adding a strong acid to a weak base (or a strong base to a weak acid) - These problems generally are related to buffers where you’ll have to see how much the pH will change. You can use the henderson hasselbalch equation to make your life easier.</p>