Recent content by MechRocket

  1. M

    Which proton would yield the most stable conjugate base?

    I do think I have a good handle on keto-enol tautomerism. If you draw those resonance structures out (de-protonation of A & B), you will see that the conjugated system upon de-protonation of C is still much more extensive because the aldehyde is a Beta-unsaturated aldehyde. I drew these side by...
  2. M

    Which proton would yield the most stable conjugate base?

    http://img638.imageshack.us/img638/5747/asdfnt.jpg My workbook says that protons A & B are both more acidic than C, with the answer being A (I do get that A should be more acidic than B). [PLAIN][PLAIN]http://img52.imageshack.us/img52/9800/asdfmi.jpg I chose C though because...
  3. M

    Can the Beta carbons of ketones act as nucleophiles? And one more question.

    Thanks SC. :)
  4. M

    Resonance Stabilization when electrons can't donate?

    Thanks very much, SC. Can you take a look at my other thread too? :) https://www.physicsforums.com/showthread.php?t=508743
  5. M

    Can the Beta carbons of ketones act as nucleophiles? And one more question.

    [PLAIN]http://img543.imageshack.us/img543/4545/asdfrr.jpg I'm wondering what the mechanism would be of the reaction in the pic I've attached. It does seem the Beta carbon acts as a nucleophile and attacks the carboxylic acid. I have a couple of questions, one general (#1) and one specific to...
  6. M

    Resonance Stabilization when electrons can't donate?

    A question in ExamKrackers asks us why triphenylmethanol is so acidic. Link to the structure below: http://en.wikipedia.org/wiki/Triphenylmethanol Explanation: I'm not seeing how the lone pairs on the Oxygen could donate into any of the rings though. It can't donate those electrons onto the...
  7. M

    How many equivalent hydrogens are there in octane?

    Yes, I was talking about n-octane and yes, I meant non-equiv hydrogens. Thanks guys, I guess Kaplan is wrong here.
  8. M

    How many equivalent hydrogens are there in octane?

    The answer to my Kaplan test (studying for the DAT, just FYI) says 3, but I think it's 4? Am I wrong?
  9. M

    When does LiAlH4 act as a base and when does it act as a nucleophile?

    When you throw in LiAlH4 with a carboxylic acid, you always see the reaction being written out as the Hydride ion attacking the carbonyl function. But why can't it just de-protonate the OH? Also, can't LAH also deprotonate alpha carbons of carbonyl functions that are pretty acidic? Why...
  10. M

    Does adding or removing pure liquids/solids affect equilibrium?

    @Yggg: I have another question. How would you write the equilibrium equation? Would you take into account H2O in the denominator or no?
  11. M

    Does adding or removing pure liquids/solids affect equilibrium?

    Brilliant, thanks!
  12. M

    Does adding or removing pure liquids/solids affect equilibrium?

    According to Zumdahl's textbook, it doesn't. In the book, there is a question that asks which way the equilbrium will shift if additional UO2(s) is added to the system. The answer is the equilibrium is not affected. HOWEVER, I stumbled upon a thread on studentdoctor in which the original...
  13. M

    Undergrad Pulling or pushing a piston slowly - Heat transferred?

    i know if you push or pull a piston QUICKLY, no heat is transferred (adiabatic process). But what if you push or pull a piston slowly? would heat be transferred in or out if you Push slowly? Pull slowly? why? thanks. i can't find the answer in my book, they just talk about the...
  14. M

    Homework help regarding forces of friction and their directions

    The Problem http://img15.imgspot.com/u/07/118/16/friction.JPG What I Think http://img15.imgspot.com/u/07/118/16/think.JPG The Correct Solution http://img15.imgspot.com/u/07/118/16/solution.JPG What Is Confusing Me Shouldn't the force of friction on the slab be pointed to the left? I...