<p>i just took a practice test on there (not the diagnostic one), and i got kinda worried, though i end up at about 790 (according to curve on the book, 800?), i just saw a lot of unfamiliar stuff on there. like a bunch of weird lab set up, and some questions about environmental chem, and a lot of lab question in general. my question is, does Barron's for chem overkilled it in terms of lab questions? and i got really confused in some part because a lot of problems it just say something like hydrogen, but not hydrogen gas. so i have no idea whether i should just assume diatomic hydrogen, or just hydrogen atoms. for those of you who took the real test, do you guys meet similar questions? and just how does Barron's stuff compares to the real thing? is it a lot easier? a little easier? and also should i worry about vocab that i only see in Barron's, and not in PR or my AP class (by the way, how does PR test compare)?</p>
<p>My point of view:
Barron's is not very good because i think it strays off topic too much. Alos, from my experience of their physics book, in which i found so many mistakes and so many printing errors i am going to use the Kaplan.</p>
<p>Interesting, yeah i found the errors in barron's annoying also. and different from their Psychology book, the explanation for the answer is really bad. for example for T/F/CE, they may have somehting like " statement I is true, and Statement II also makes sense, so Statement II explain Statement I, fill in CE." geez, no way i could of figure that one out...</p>
<p>the labs in Barrons freak me out too. How would college board expect avergae highschool students to know all thos setups?? Anyway with hydrogen and halogens and nitrogen I think you're always supposed to assume that they're in gaseous state because that's there lowest energy state and is thus the state that they most easily occupy</p>
<p>are the practice tests accurate? that's the only book I have for chem!</p>
<p>P.S. It says that 75-85 is 800, but in the official CB book its more like 81 for 800? How many wrong for an 800?</p>
<p>i finished the 3rd practice test in barron's but i've found some answer in the T/F/CE section very suspicious. on number 106, it claims that ionic bonding is the strongest bond, but isn't network covalent bond stronger (i.e. boiling pt of salt vs. diamond, isn't diamond higher?)? i thought that was really weird, if nayone could explain to me that would be great. also on 115, i thought it was TT, but it was TF, because the reaction in statement 1 forms a gas, and not a precipitate. But I thought the two statement are separate. I thought reaction that produces a precipitate or a gas goes to completion? if that's true, isn't both statement true? i serously need some help, please.</p>
<p>boiling pt of diamond is greater
diamond is 4827 or something and NaCl is in the 1500's. This is because of the giant covalent structure(which in this case is stronger) of diamond as compared to the ionic structure in NaCL.</p>
<p>Ionic bond is the strongest bond. I really don't know why, but I know that it is, sorry.</p>
<p>Also, 115.. the second statement.. well, just because you cannot assume that it always goes to completion.
Oh wow, sorry. I thought I would know how to explain it because my teacher explained it to me, but I guess not.</p>
<p>wait a minute... so network covalent is actually stronger??
sunpenguin, what was the explanation in the back of the book?</p>
<p>as lame as always, it just says that ionic is the strongest bond. My AP teacher said that network covalent is stronger also. and for 115, it says the second statement is false just because the reaction in statement one produces gas not precipitate. which makes no sense. here's what 115 says:
I. the reaction of CaCO3 and HCl goes to completion.
II. reactions that form a precipitate go to completion.</p>
<p>Can anyone just give me a straight answer, does reaction that forms precipitate go to completion? it would make sense right? since solid is not part of the equilibrium constant?</p>
<p>you can tell if it goes to completion by the equilibrium constant?</p>
<p>wait. equilibriums dont go to completion haha nvm.
they arent part of the constant.... but can still be part of the equilibrium</p>
<p>Precipitation goes to completion since solid material is not included in the equilibrium expression. Since you're "removing" material from the equilibrium, it will keep on reacting until one or all f the reactants are gone.</p>
<p>On bonding</p>
<p>I always thought that bonding depended on electronegativities.</p>
<p>Small difference (covalent) in electronegativity is a strong bond because the electron is shared more equally</p>
<p>Big difference (ionic) in electronegativity is a weak bond because one atom has a stronger pull on the electron</p>
<p>Barron's definitely has some errors in its answers too. there was a question asking the charge on nitrogen in the compound ammonia, NH3, and I'm 100% sure that it's -3 even though the answer said it was +3.</p>
<p>It is -3; the 3 Hydrogens accumulate a +3 charge</p>
<p>Yeah, I knew Barron's was wrong! Both chem teachers at my school confirmed....</p>
<p>Barron's chem SUCKS guys, it's filled with senseless lab setups; I took a CB actual SAT II Chem test and got a 730 even with idiotic mistakes, don't trust barron's!</p>