<p>Do you guys think that they will ever ask to find integrated rate laws?</p>
<p>sporty4:
As far as frq3 from 2009, they want you to remember that the rate law is only affected by the reactants in the slowest (rate-determining) step of the reaction. Then based on the first reaction, which includes Cl as a reactant, you basically have to fiddle around with the equilibrium constant expression in order to find the link between [Cl] and [Cl2]. Hope that kinda helps…</p>
<p>you need to memorize integrated rate laws for the exam but they’re usually only 1st or zero order because according to my chem teacher, 2nd order takes too long</p>
<p>edit: gahh new page
can anybody still answer my question about which order would proceed the fastest? </p>
<p>zero, first, or second?</p>
<p>
Look up Scoring guidelines.</p>
<p>i read the scoring guidelines but that kinda confused me.
i know how to do the rate law things for the ones above it but I don’t know how to do 3eii.</p>
<p>And do you think the 2 PR tests are good indicators of the actual exam?</p>
<p>thanks</p>
<p>How do I know whats the cathode and whats the anode? Is it the one higher on the list? Do I have to reverse the reaction to make it the same as the list given?</p>
<p>From my understanding the PR tests are slightly tougher. They make sure to cover every topic area, so they overdo some of the less important ones i. e. organic chem.
phillydot:
In the case of that specific frq, they tell you copper (solid Cu) is being plated and O2 gas is formed. If you look for these in their reactions, you can flip what you need to so that these are both products of their reactions.
In a galvanic/voltaic cell, where the 2 half-cells are separated, the reaction with the highest reduction potential will occur at the cathode. The reaction with the lower red. pot. will occur in the opposite direction: that is to say, the oxidation reaction will occur at the anode.</p>
<p>for frq question 8 in 2000
<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;
<p>how do you sketch or predict a titration curve?</p>
<p>IAmCool:
Since you start off with nothing but NH3 and are given its Kb, you need to recognize that it’s a weak base (can accept H+ to form NH4+). So its pH without any HCl is going to be higher than 7. Getting it correct by guessing apparently got you the point.
For the second point I think they want you to know that neutralizing a weak base only requires ~half its volume if this is done with a strong acid. Example: 30mL of HNO3 can be used to neutralize 60 mL CH3CO2- (assuming similar molarities).
Then the 3rd point is knowing that since you’ve got a STRONG acid and a WEAK base, pH will be slightly less than 7 at the equivalence point.</p>
<p>edit: Hope I was of some help to at least someone… Bedtime, good luck everyone.</p>
<p>can someone help explain titrations to me please! D:</p>
<p>i need help with all of it kind of…but one question off the top of my head</p>
<p>if a titration reaches equiliance point, then the moles of OH- and H+ should be equal right? (correct and explain if im wrong lol). Then why wouldnt all pH’s at equivalance point be 7</p>
<p>Good luck everyone.</p>
<p>well i decided to skip learning the descriptive chem portion of the frq. all thanks are due to senior slide</p>
<p>Anyone know the colors of burning certain elements?</p>
<p>yes bdgz that makes sense! thank youu i’m really hoping it’s a hydrate experimental problem on this frq, only experimental portion i can do. </p>
<p>@zinc</p>
<p>Na: yellow
K: violet
Li: crimson
Ca: orange-red
Ba: green
Sr: bright red</p>
<p>@IamCool
sweet thanks for the quick reply!</p>
<p>Mg is white that is another one</p>
<p>yeah no problem zinc! i just had it right in front of me haha</p>
<p>can anybody explain for <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; </p>
<p>2008 question 3 f</p>
<p>why you would divide by 1/2 to find the rate constant?</p>
<p>hey anyone know do they still make you do stupid calculations without calculators on the multiple choice? i have an old test (early 2000 or 1999 i think) </p>
<p>and the question had me multiplying .09(.082)(400) to find pressure, i tried to just figure it in my head and got a wrong answer that was on the sheet, plugged it into my calculator and got the right answer, that type of math seems like a dumb reason to miss a question</p>
<p>@dkdkdk, probably it is from <1998.</p>
<p>That was on the 1999 test. I pulled a “?!?!?!” on that one as well.</p>