If you’re really secure, you can admit when you don’t know something, so this post proves I’m reasonably secure. What follows are a series of questions I’ve not been able to find the answers to easily. Please enlighten me if you’re able to help.
#1. In NMR, how long does it take a hydrogen nucleus to absorb a quantum of radiation in a 500/42.5 Tesla field? (e.g. at 500 megaHertz).
a. Is this even a reasonable question?
#2. Rotation about the carbon carbon bond attaching a methyl group is ‘fast’, so fast that all 3 hydrogens of the methyl group appear equivalent on NMR. How fast is this? How slow would it have to be in CClBrI-CH3 for us to see distinct signals from each of the 3 hydrogens of the methyl group?
#3. How many kiloCalories high must a transition state be at room temperature (300 K) between conformations A and B of a single molecule to isolate each conformation? How many kT is this?
#4. What is the velocity in meters/second of a calcium ion at room temperature
a. In the gas state
b. What is the effective velocity of a calcium ion in water — e.g. does the Ca++ drag water molecules along with it slowing it down?
#5. How far on average does a a calcium ion move in water at room temperature in 1 milliSecond (I have an ulterior motive for knowing this).
#6. Chemists are always dealing in concentrations (molar, milliMolar, microMolar, nanoMolar, picoMolar, godzillaMolar etc. etc.). At what volume does the notion of concentration cease to make sense? Another ulterior motive here. Clearly it doesn’t at the cubic Angstrom level, and it does at the cubic milliLiter.
#7. Grignard reagents use magnesium. Has anyone ever tried using calcium to make one? If not, why not?
#8. Can the lone pairs of electrons on oxygen in a ketone be considered in any sense a MOLECULAR orbital?
#9. Does anyone really believe a molecular orbital exists for the X chromosome with its 155,000,000 nucleotides all linked together in one long chain?