2009 DAT solutions

[pilotdentist]

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I just took the 2009 test and am looking up answers of how to do the ones I missed. Does any solution manual exist? I found fragments of questions in past forums. Below are the specific ones I have questions on.

Is the real PAT this easy or has it gotten tougher since '09?

Any help for the ones below or a link to other solutions would be appreciated! Thanks.

Survey of Natural sciences:

14- What is the major intracellular buffer?
Answer: Bicarbonate
I thought this should be PHOSPHATE. I've read bicarbonate is the extracellulare buffer and phosphate is the intracellular buffer.

65- if K=2 for 2NO + O2 > 2 NO2
then what is K for NO2 > NO + 1/2O2
Answer: K = (1/-2)^1/2
I realize the original equation is reversed and halved. I am guessing the reveral is the -1/2 and the ^1/2 accounts for it being halved?
80- not sure why its sp2 and not sp3
90- What technique can be used to separate non-volatile substances?
Answer: TLC
I guess distillation separates volatile bc they are reactive and go into the gas phase vs non-volatile which do not?
Ochem 99/100- These were random. Not sure of the logic for either.
QR:
Anyone who knows how to do 4,5,6,8,24,34,39,40 please post any answers.
Thank you!

 

[1Overdrive]

#14 - supposed to be phosphate. ADA is wrong here.
#65 - Not sure
#80 - 3 bond regions = sp2 (remember, a double bond only counts as one bond region, even though there are two bonds)
#90 - not sure why TLC is the answer. TLC doesn't separate stuff, only used for analysis of polarity of compounds. Again, ADA might be wrong here.
#99 - I'm not so sure of their reasoning here. They never included a reagent with Bromine, so take their answer with a grain of salt.

QR:
I could only really solve 24, 34 and 40. Here's an image of the solutions:

 

[gobinoob]

Yeah this thing is all jacked up; I noticed when I was doing it that there are different versions of the test and mistakes in all versions. For example, in the booklet I have, #90 is about ozonolysis. Also, as for #80, believe it or not, there is one version with three bonds coming out of that carbon and another version with four bonds, but the answer in both booklets is 120 degrees. And wtf is with #99 and #100?! Also, there was some confusion about wrong answers due to napthalene being drawn in place of anthracene or something. In general, don't sweat the natural sciences for this test; just do it for fun lol...

 

[1Overdrive]

Yeah this thing is all jacked up; I noticed when I was doing it that there are different versions of the test and mistakes in all versions. For example, in the booklet I have, #90 is about ozonolysis. Also, as for #80, believe it or not, there is one version with three bonds coming out of that carbon and another version with four bonds. Yet the answer is the same for both: 120 degrees. Also, there was some confusion a while back about wrong answers due to napthalene being drawn in place of anthracene. In general, don't sweat the natural sciences for this test; just do it for fun lol...

Ah, for #80, the version I have has an sp2 carbon. Also, upon reviewing #90 on my old one (I only based some of my answers on OP's), I did have a question about ozonolysis.

But yes, after taking the real DAT, Ochem is a bit easier than what you see on 2009 ADA.

 

[gobinoob]

Oh and the math on this thing is insane... I think it's the reason Ari made his math hard as well... don't sweat the math either!

 

[pilotdentist]

Thanks for the follow up.
#80 my test has a Carbon bonded to 4 molecules with 120 as the answer. Both adjacent carbons are definitely sp2. I didnt know if I was missing something, but I thought the 4 electron group carbon it points to should be sp3.

Yes, this math definitely was tough. I got a 17 in it which was a big surprise after doing 20 in bootcamp, 23 in q vault. I know this is a small sample and the intent is to LEARN from sample tests but who are we kidding, everyone who hasn't taken the real test yet will always be rack n' stacking themselves...

Anyway, I am happy with the scores but trying to learn from it it so it wasnt 4.5 hrs wasted. Seems like the ADA SUCKS at helping in this cause.

Anyway, thanks for confirming some of my suspicions and doing your best to answer some of these.

 

[BrazilianRider]

Just for any other future people checking this out, my #80 also had an sp3 carbon (three carbons, one hydrogen) and the answer sheet said 120... Glad to know I get another point back 😛

 

[D.en.tist to be]

solutions DAT 2009??