Official AP Chemistry Thread (2014-2015)

@heckarad I’m glad there is someone else here who is aiming for a 3…lol… I honestly don’t think I can pass. I know some of the material, but when I look at questions, I don’t know where to start. I guess it shows I need more practice, which I’ll probably get starting this upcoming weekend… My teacher is holding an mock AP exam on the 25th.
And none of it is my teacher’s fault either… He is doing an amazing job for a first-year AP teacher, much better than my history teacher, who has been teaching APUSH for a few years.

@PhilipL I feel you honestly… my teacher is fantastic as well but between my poor work ethic and the difficulty of the material I’m always a little lost. I’ve been killing myself this whole semester to maintain my B in his class, but I just wanted to take the AP exam anyways just to prove to myself I could get through it I suppose :slight_smile: good luck!

@PhilipL My teacher’s holding a mock exam on the 25th as well (also a first year!), hahahaha!
Thus far, what have people thought about the prep books? I have Barron’s and 5 Steps to a 5. I’ve 5 Steps to be slightly easier, but more in line with what I expect from the Collegeboard. Barron’s (as always) feels very difficult. How is Princeton Review?

Everyone told me to use Princeton but I think it’s short

My teacher says Fast Track to a 5 and the Princeton Review are the best. I have them both (the first one I got from the school library) and they are both pretty good. I like PR better but whatever.

2 weeks from now I will be taking the AP Exam test. Its too late for me to get a review book so does anybody know what online resources that are free that I can use that will help me study? I am desperately trying to squeeze out a 3 from this test and this year has been a rough year for me. I don’t know if I can cram all I’ve learned in the next 2 weeks. Thanks for the help in advance.

bozeman AP crash course on youtube will destroy the multiple choice

lol i’m so screwed still haven’t taken a single practice test

Is organic chemistry tested? (if yes then please tell me the specific topics)
thanks

No

So I just started reviewing with 5 steps to a 5 and so far I don’t like it. I have a good chem background, but the frqs are rather difficult, along with the m/c. What can I do to study for those? And should I get Princeton Review instead by tomorrow?
We have a practice test on Friday with the 2014 m/c :frowning:

@skieurope Technically, organic is not tested, but you do have to know how to apply intermolecular forces to organic molecules. I have found that most students have a pretty bad understanding of intermolecular and intramolecular forces, and it shows when explanations are required.
I found the McGraw 5 steps book to be terrible. This is especially true of the practice exams at the end of the book. Do not even use these, as they contain errors and are poorly written, and the questions in each test basically repeat one another. Furthermore, the FRQs are hardly anything like the actual AP.
I’m taking the makeup AP on May 21st.

@Smargent The problem with Barron’s is that a fairly large percentage of their questions are kind of bogus. I don’t like review book questions too much because most of the authors have never been on an AP test development committee. I found this to be most stark on AP Music Theory:
Barron’s AP MC Score: 58 / 75
Actual AP Exam MC Score: 74 / 75
I suggest looking up one of the old-style AP multiple choice tests and seeing how you do on one of those. It may not be the same style, but all the questions are legitimate.

Has anyone done the free online Barron’s test at
http://barronsbooks.com/AP/chem/ap_chemistry_2013.html?
I’m having trouble with #55, which describes a galvanic cell Cu(s) + 2Ag^+1(aq) → Cu^+2(aq) + 2Ag(s). The scenario states that Ag+ is removed. How does this affect the reaction quotient and voltage?

I understand that the reaction quotient would increase because you’re dividing by a smaller number. But I don’t understand why equilibrium shifts right when Ag+ is a reactant. Shouldn’t it shift left? I don’t understand why or how voltage changes in a concentration cell. Can someone teach me how, or direct me to an online resource that sufficiently explains how concentration cells work? I haven’t been able to find anything sufficient.

@rhubarbb Because the reaction quotient increased, it means the reaction became more product-favored, so its equilibrium shifted right.

I’m currently using the AP Chemistry Barron’s book 7th edition. Its great! I’m also practicing from the college board website. They have all short response questions for the AP test from the years 1999-2014. You should ask your AP teacher if she/he can give you the official practices tests for 2014 and 2013 since all AP teachers have access to it.

There is an error in Barron’s answer. Yes, the quotient is increased, which means there is a shift left, so the voltage should decrease (not increase). The correct answer is “the voltage would decrease and Q would increase.” Their equilibrium expression in the explanation of #55 is also wrong and should not include the metals. If you look at the Nerst equation this should make better sense to you. Subtracting a bigger number from the standard cell potential will give you a smaller cell potential. If you need more explanation check out the chemtours on this website: http://www.wwnorton.com/college/chemistry/chemistry3/ch/19/chemtours.aspx

40/60 on the Barron’s practice exam… any guesses on what that would look like on the actual AP test?

I got a book from amazon for like 10 bucks. PR review of new format. Kind helpful
Make sure you know the new format and the set ups… cuz I think there will not be definition based questions on MC or something? Review what you got wrong and trace it back to the Big Ideal

@zeppelins that’s definitely around a 4 (that is, if you do about the same on the FR section).

My teacher gave us a practice exam that the CB gave her earlier this school year. 50 MC. I received a 44/50. What sucks is that I may do well on the MC, but the FR is very difficult (IMO). FR sucks!!