May 2010 Chemistry

Test Preparation SAT Subject Test Preparation
181

<p>It is A (the ch2cl2 one) without a doubt. i’m most positively sure.
The double bonded structure has isomers since the double bond could have been placed in a number of spots between carbons that result in a different structure.</p>

182

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<p>Hopefully your reasoning is more scientific than mine.</p>

183

<p>I regret putting CH2Cl2 now. Take a look at this figure: <a href=“http://upload.wikimedia.org/wikipedia/commons/7/7f/Isomerism.png[/url]”>http://upload.wikimedia.org/wikipedia/commons/7/7f/Isomerism.png&lt;/a&gt;&lt;/p&gt;

<p>It seems as though it may be an enantiomer. I don’t remember the other choices, but it seems like this one is ruled out :(</p>

184

<p>but can’t the cl be on oppposite sides of the h or next to each other?
This would make it an isomer.</p>

185

<p>If the answer is CH2Cl2 I’m making dumb mistakes left and right. I think I got isomers confused with cys/trans. Otherwise, I felt pretty sure it was the one with the double bond…</p>

186

<p>^aren’t cis and trans isomers?</p>

187

<p>^ Oh. Then I’m pretty sure the double bond answer is correct.</p>

188

<p>Yes, cis and trans are isomers. And when I speculated that CH2Cl2 was an enantiomer, I implied that it was an isomer (enantiomers are a type of isomer). So the question asked which one was NOT an isomer, and that would mean all of us that put CH2Cl2 would be wrong. I never understood isomers with extreme clarity, so I’m not going to say my answer is right, but I mean when looking at the figure on wikipedia…It certainly looks like an enantiomer.</p>

189

<p>Cheeseball, what was the double bond answers formula?</p>

190

<p>I took the Chem test yesterday, along with Math 2 and physics… needless to say when i got out of the testing center i wanted to cry… I’m in AP Physics now and that was the only test I think I scored in the mid/low 700s.
Since I’ve only taken Honors Chem and that was LAST year, although I did study for the test, i am not so sure about how well I did.
Does anybody know when the scores are going to be released?</p>

191

<p>20th of this month.
I heard it’s always released at 5 am, right?</p>

192

<p>better curve on this test than one published?</p>

193

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<p>That’s correct.</p>

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<p>I hope so.</p>

194

<p>dipole - I’m not sure, but I picked that one based on my knowledge that anything that has double, triple bonds don’t do isomers. My class had a guest speaker for the Organic Chem unit since my teacher didn’t even know where to begin with it, and I remember him saying that. I’m in SL IB Chemistry so that’s why do we organic. But don’t take my word for it, since I’m not 100% confident that that’s the right answer.</p>

195

<p>Could anyone post up the curve for the released exam? That would be great.</p>

196

<p>^ I will. Just a second.</p>

197

<p>Please help and tell me what number the problem about “the least abundant gas in air” was…</p>

<p>seriously… can anyone remember what the NUMBER of the question was and not the answer???</p>

198

<p>85 - 800
84 - 800
83 - 800
82 - 800
81 - 790
80 - 790
79 - 780
78 - 780
77 - 770
76 - 770
75 - 760
74 - 760
73 - 750
72 - 750
71 - 740
70 - 740
69 - 730
68 - 730
67 - 720
66 - 720
65 - 710
64 - 710
63 - 710
62 - 700
61 - 700
60 - 690</p>

<p>This is CC, so I assume I am safe stopping there.</p>

199

<p>85-82 800
81-80 790
79-78 780</p>

<p>it goes in pairs of raw score from that point on</p>

<p>so is A the one that does not have an isomer?</p>

200

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<p>The near-concensus seems to be that (C) is the correct answer.</p>