<p>in my chem book, arrhenius equation problems are solved using a graph you drave. -Ea/R=slope. i guess you just plug in the rest of the numbers. i doubt it'll be on the test</p>
<p>What is the exception for Al when forming complex ions? What's an example?</p>
<p>Al(OH)4 -
that's a complex ion</p>
<p>Thanks for the help but I don't get what's so special about Al when people say ti ahs an exception.</p>
<p>so what's the overall charge on the complex ion?</p>
<p>The overall charge is -1.</p>
<p>Its just an exception to the twice the charge rule. By that "rule" it should be [Al(OH)6]3-. Nothing else special about it.</p>
<p>Well, final last-minute studying before this thing. I have a few critical questions:</p>
<ol>
<li><p>Do we need to use significant figures for ALL calculations on part 2, or just when they ask for it in the instructions?</p></li>
<li><p>Are there any weird or obscure formulas we need to know that aren't going to be on the tables given to us?</p></li>
<li><p>Are there any major things to remember for multiple choice especially?</p></li>
<li><p>Just for a general idea, how many should one omit (for example, I suck at lewis dot diagrams, so I'm planning on omitting all of those, but just wanna be careful and not omit too many). I'm aiming for a 5...</p></li>
</ol>
<p>Thanks guys.</p>
<p>For sig figs, I think they take off 1 mark if it's off by more than 1 digit for each calculation.</p>
<p>for a 5, you need approximately 65% correct
MC and the FR questions are 50% of the entire ap exam respectively
therefore...you need about 65% on each section to get a 5
that's a 48.75 /75 on the mc, and 4 questions correct out of the 6 problems in free response.</p>
<p>I just worry about the FR. The MC shouldn't be an issue. 48.75/75 isn't that bad at all. 4/6 free response... I better not blank out or something ;)</p>
<p>Yeah me too... FR will be my demise x_X</p>
<p>i need a quick review of strong acid-weak base titrations and acid-base buffers</p>
<p>i am very scared about tomorrow morning</p>
<p>Review on buffers could help me as well.</p>
<p>I am currently cramming all of it into my head. ugh. I want to review titrations and buffers too... not too solid on those two topics.</p>
<p>this sort of helps.</p>
<p>so who's pulling a semi all nighter (3 am)</p>
<p>i remember for some equation ( not necessarily titration or buffer) that you have to switch around the reactant and product and then change the sign of some constant ..</p>
<p>what was that?</p>
<p>i don't think i've actually ever pulled an all-nighter in my whole academic career. best not to start tonight. lol</p>