Official 2011 AP Chemistry Thread

<p>Finished equilibrium today and moving onto Thermochemistry. Still have to do electrochemistry, organic, and nuclear, so hopefully we can finish on time.</p>

<p>does anyone know what college course ap chemistry is? (chem 101, 102 etc.)</p>

<p>The College Board website says:</p>

<p>“This course is designed to be the equivalent of the general chemistry course usually taken during the first college year.” So it probably covers two semesters of beginning-level chemistry.</p>

<p>Today was my last day of school before my two-week spring break. We come back and have one full week and then a two-day long week (no regular school Wednesday through Friday) and then my AP chem final is Saturday morning. It’s a mock AP. Then we have four more days of class and then the AP.</p>

<p>We still haven’t finished electrochemistry or started organic. I’m terrified. I literally have 7 more classes before the final, in which we have to learn two chapters and review the entire year.</p>

<p>AHHH.</p>

<p>It sounds like you’ll be fine, coffeeandtea. If you’ve finished equilibrium, thermodynamics, and kinetics, then understanding electrochemistry should be fairly easy. If organic chemistry is the only other thing you haven’t done, that’s fine, because it hardly shows up on the AP test at all. The only thing you’ll probably need for organic chemistry is recognizing some elementary functional groups.</p>

<p>You have 2 full weeks to review everything you’ve learned, then a week and a half of learning electrochem, then a long weekend to take multiple practice AP exams.</p>

<p>Should thermodynamics be easy? We’re learning it now (I think we’re done actually) and it’s suspiciously easy, especially after doing acid-base equilibria.</p>

<p>Yeah, it’s fairly easy. I’m not sure what book you’re using but if yours split thermo into two chapters then it would be wise to review some of the first chapter (<em>cough</em> bond energies). If you’re teacher is like mine he/she will put a question on the test that relates back and might trip you up.</p>

<p>just finished nuclear today, still have to do organic, electro, kinetics, and lab. HOLLA</p>

<p>Please…I need help with solving this equation. I just can’t figure out what to do. Here it is:
Lead is a poisonous metal that especially affects children because they retain large fraction of lead than adults do. Lead levels of 0.250 ppm in a child cause delayed cognitive development. How many moles of lead present in 1.00 grams of a child’s blood would 0.250 ppm represent?
Given: molar mass of lead is 207.2 g/mole</p>

<p>K thanks</p>

<p>Hey. My class is currently on Chapter 14 of the Zumdahl book (Acids and Bases). Do you think my class will be able to cover everything before exam time? Or no?</p>

<p>Our spring break is the last week of April.</p>

<p>Custard:</p>

<p>I had to look this up, but ppm (parts per million) is a type of mass fraction. It’s the mass of the part (Pb) in 1,000,000g of the total substance (blood). So 0.250 ppm = (0.250g Pb)/(1,000,000g blood). Set up a proportion:</p>

<p>(0.250g Pb)/(1,000,000g blood) = (x)/(1.00g blood)
Solve for x, which is the number of grams of Pb. Then use what you found for x & the molar mass to find the number of moles.</p>

<p>We finished thermodynamics in two days. Now all we have is electro and nuclear.</p>

<p>We’re doing organic chemistry right now, and I think we’re going way beyond what the AP exam covers. It’s kind of frustrating.</p>

<p>On the bright side, from the past FRQs that our teacher handed out to us, I don’t need to worry about getting a 5. :D</p>

<p>I was reading some of the AP Chemistry threads and I came across a really interesting chemistry “game.” One person asks a question, then another person answers it and writes another question. The cycle continues onwards. This will be a good review over the entire year’s chemistry topics. So let me start it out …</p>

<p>Why does aluminum have a lower ionization energy than magnesium, even though ionization energy increases across a period? Why does oxygen have a lower ionization energy than nitrogen?</p>

<p>Yeah… I’m going to fail periodic trends…</p>

<p>Hmm… I’m just guessing, but is it because Mg’s electron configuration is [Ne]3s2? Therefore, its s orbital is full, so it’s harder to remove an electron from an orbital that’s already full… Whereas aluminum’s electron config. is [Ne]3s2 3p1. Since its p-orbitals only have one electron, it’s much easier to remove it since the shells of the p-orbital isn’t full.</p>

<p>And it’s the same for oxygen as well. Since nitrogen’s electron configuration is [He]2s2 2p3, the s-orbital is completely filled with 2 electrons and one electron fills each p-orbital, which makes it really stable. On the other hand, oxygen’s electron config. is [He]2s2 2p4. So one of the p-orbitals have 2 electrons while the other 2 p-orbitals only have one. Thus, it’s much easier to remove one of the 2 electrons to fill the p-orbitals with one electron, just like nitrogen.</p>

<p>Does anybody have a list of the acids and bases with their charges and formulas?
If so, do you mind sharing it, cause I don’t have one… :[</p>

<p>Hello!
I will be taking AP Chem bext year. To students who use Zumdahl Chemistry, I have a question. Is there any important differences and changes between 7th edition and 8th edition?</p>

<p>Thanks in advance!</p>

<p>I was wondering if anyone of you had a list of the colors of common compounds in ap chemistry. thanks</p>

<p>Keeetz, you are correct. It is easier to move from a high energy state to a lower one than to remain in the same energy state. As for oxygen, because one of its 2p-orbital has two electrons, it is easier to remove one due to electron-electron repulsions.</p>

<p>Okay, another question…</p>

<p>What is an easy way to identify a strong Lewis acid? strong Lewis base?</p>