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Old 06-08-2012, 10:56 AM   #1
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Default ridiculous mcat question of the day?

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Anyone else find today's question absurd? Since when are tails of phospholipids polar?


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Old 06-08-2012, 11:05 AM   #2
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Anyone else find today's question absurd? Since when are tails of phospholipids polar?


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I did
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Old 06-08-2012, 11:05 AM   #3
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Anyone else find today's question absurd? Since when are tails of phospholipids polar?


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I believe that meant to say heads.
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Old 06-08-2012, 11:11 AM   #4
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I believe that meant to say heads.
That's what I figured
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Old 06-08-2012, 12:11 PM   #5
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Stupid question.

The heads of phospholipids are the polar part and the tails are the non-polar.
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Old 06-08-2012, 12:33 PM   #6
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WOW! They should definitely be ashamed. lol
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Old 06-08-2012, 03:48 PM   #7
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This is tough. BF3 is non-polar. I got it 'right' b/c I said it was polar, thus the tails would be polar and the heads non polar.

Forgot that BF3 is a lewis acid and has no lone pairs.

Good catch.
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Old 06-08-2012, 06:10 PM   #8
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I dont see anything wrong with the question...What is wrong with it?
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Old 06-08-2012, 06:23 PM   #9
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I dont see anything wrong with the question...What is wrong with it?
huh! I guess they corrected it. The options used to say "polar tails" instead of heads.
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Old 06-08-2012, 07:27 PM   #10
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huh! I guess they corrected it. The options used to say "polar tails" instead of heads.
Ok...I got it wrong anyway because I thoought BF3 was polar.
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Old 06-08-2012, 09:12 PM   #11
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BF3 is very soluble in H2O though.....shouldn't if be polar then?
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Old 06-08-2012, 10:11 PM   #12
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BF3 is very soluble in H2O though.....shouldn't if be polar then?
I am not sure about is solubility in H2O but BF3 is a non polar lewis acid with a net dipole of zero. Remember BF3 has an empty orbital that can accept electrons.
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Old 06-08-2012, 10:12 PM   #13
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****....3 valence electrons right?
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Old 06-08-2012, 10:13 PM   #14
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****....3 valence electrons right?
Yes
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Old 06-08-2012, 10:15 PM   #15
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BF3 molecule is symmetrical with bond angle of 120 degrees
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