<p>was “What is the least abundant gas in air?” problem before or after the isomer (#49) problem? please respond. anyone. hbo</p>
<p>^ Sorry, but I don’t remember that. 
If I had to guess, I would say after (about 55% sure).</p>
<p>^ yeah some other people told me that it was around #53?.. should i cancel or not? god… this is killing me.</p>
<p>Man, this isomer question is confusing a lot of us… I’m just going to assume the worst and say I got it wrong. Do they ever throw out questions? I’m sure the curve will compensate, though.</p>
<p>@user2134</p>
<p>It doesn’t matter if the Cl’s are “next to each other” in the formula or not. The bonds of this molecule are ~109.5, so the 3D molecule will look the same either way.</p>
<p>As for enantiomers, the fact that all the R groups about C are singular atoms for this molecule makes me think that answer choice (A) doesn’t have enantiomers. Anyway, I didn’t really consider that at the time, I chose (A).</p>
<p>@silverturtle</p>
<p>Haha, same here with the volume/temp problem: I didn’t use any formulas, just reasoning. (Increased temp=>Increased volume, Decreased pressure=>Increased volume)</p>
<p>Also, I posted this on another thread a couple days ago before I realized this one was going on:</p>
<p>1.___mL 1.0M [strong base] required to neutralize 100mL of 1.0M [monoprotic weak acid]… 100mL
2. Petroleum, fractional distillation, b/c of different boiling points… T, T, CE
3. The one with the different lab equipment, buret (C) was the answer for two of them.</p>
<ol>
<li>I’m pretty sure NaOH was a choice, so 100 mL for that. Regardless, it would be 100 mL of a strong Base.
2.,3. you’re right. God I feel like an idiot for putting graduated cylinder for the first buret question (which one is used to measure the volume of titrant).</li>
</ol>
<p>what did you guys put about the atm of O2 in the closed container with a total pressure of 1.5 atm</p>
<p>.5 atm ?</p>
<p>According to my AP Chemistry notes, CH2CL2 is not an enantiomer, since generally enantiomers have four different atoms bonded to a central carbon. Also, since all the bonds are single bonds, there’s free movement of the atoms around the central carbon.
The one with the double bond has isomers. The double bond can be in numerous positions between different carbons, creating different compounds and hence having isomers.
I’m pretty sure I’m correct, not to sound arrogant or anything, but I’m pretty confident in my knowledge.</p>
<p>@silverturtle</p>
<p>is the test generally curved in that manner?
cause if that’s the case, it seems pretty difficult to get an 800 on this test
you’d think if anything, the chances of getting an 800 would be greater because you have more chances of getting a question wrong just by the number of questions on the test.</p>
<p>i may be wrong though. i have never taken the chemistry subject test before. :P</p>
<p>it was soooooooooooo easy. …phy and math 2 were easy tooo.</p>
<p>I hope the curve is better than that… I’m not a strong Chem student due to a teacher who hates IB and its curriculum so I’d be really happy with anything 700+ this time around.</p>
<p>Mycoalwin, which letter are you saying is the answer?</p>
<p>
</p>
<p>I have no reason to think otherwise. That’s the only official released curve that I know of.</p>
<p>
</p>
<p>Yes, if you leave nothing blank, you can only miss two questions out of 85.</p>
<p>I’m saying the answer was A, CH2Cl2</p>
<p>^ Well, that’s good. Did anyone ask his or her chemistry teacher?</p>
<p>Silverturtle I believe you’re wrong on the curve. I remember looking at chem’s curve, and I remember it being easier than bio. -5 for 800 I think… if you have CB’s big book of subject tests you can find it. I looked at my friend’s copy.</p>
<p>
</p>
<p>I merely typed up what the official book says.</p>
<p>lol I asked my AP chem teacher, and she said the answer is A for the isomer one. So i’m guessing that we’re good then.</p>
<p>^ I’m not good!</p>
<p>Woohooooo.</p>