Search found 33 matches

by jameswilliamogle
Sun Aug 03, 2008 2:16 am UTC
Forum: Science
Topic: Stability of sodium borohydride in aqeous solution?
Replies: 6
Views: 6052

Re: Stability of sodium borohydride in aqeous solution?

Most NaBH4 reactions I've seen use EtOH as solvent. It isn't very soluble, but NaBH4 is so cheap people use 4 eq. or so and get a clean reaction. I used it this year to make a standard of 1-phenylethanol from acetophenone (yes, I know I'm cheap) and the reaction proceeds readily in EtOH w/ just 2 eq...
by jameswilliamogle
Fri Aug 01, 2008 6:29 pm UTC
Forum: The Help Desk
Topic: MS Excel chart Trendline help needed... (yes, i suck...)
Replies: 10
Views: 3402

Re: MS Excel chart Trendline help needed... (yes, i suck...)

The trendline not showing as noted in the original post can be fixed by first clicking the series in the plot which needs a line, then adding the trendline. It won't show, except for in the legend, so now you right click again after clicking on the series, then go to the top option (probably layout...
by jameswilliamogle
Wed Jul 30, 2008 1:51 am UTC
Forum: The Help Desk
Topic: MS Excel chart Trendline help needed... (yes, i suck...)
Replies: 10
Views: 3402

Re: MS Excel chart Trendline help needed... (yes, i suck...)

One more try on this; I know now that excel can't plot a trendline from the data, as its apparently pretty limited w/ the built-in algorithms for this processing. The time limit for the initial submission is up, but I might be able to fix this in the revision stage. Is there any freeware out there t...
by jameswilliamogle
Sun Jul 27, 2008 12:31 am UTC
Forum: The Help Desk
Topic: MS Excel chart Trendline help needed... (yes, i suck...)
Replies: 10
Views: 3402

Re: MS Excel chart Trendline help needed... (yes, i suck...)

I never noticed that before... Attached is the '03 xls. The equation, when I solve backwards and try to plot it, doesn't give enough accuracy, so I think the equation its calculating is off. The chart on the right is what I want the chart to be formatted like graphically, but with a trendline. I don...
by jameswilliamogle
Sat Jul 26, 2008 2:38 am UTC
Forum: The Help Desk
Topic: MS Excel chart Trendline help needed... (yes, i suck...)
Replies: 10
Views: 3402

Re: MS Excel chart Trendline help needed... (yes, i suck...)

Thanks, and I didn't clarify what I did enough, I guess.

I reverse the order for the X axis, so that I get high-to-low ordering (since its IR stretch order, it makes more sense this way for this data), and then I can't see the trendline.
by jameswilliamogle
Fri Jul 25, 2008 6:26 pm UTC
Forum: The Help Desk
Topic: MS Excel chart Trendline help needed... (yes, i suck...)
Replies: 10
Views: 3402

MS Excel chart Trendline help needed... (yes, i suck...)

I've got a graph that I'm trying to finish for an ACS pub for which I can't get the trendline to show up. It shows up if I click linear, polynomial, or logarithmic, but doesn't show up for exponential or power. The equation and corr. coef. show up, though, so I know its calculating it correctly, but...
by jameswilliamogle
Fri Jul 25, 2008 3:00 pm UTC
Forum: Science
Topic: Rapid Oxidation?
Replies: 6
Views: 1226

Re: Rapid Oxidation?

Use XeF 6 . That'll oxidize any metal you want to (as far as I know), and all the ones you listed. Its not practical, though. Aqua regia is not that nasty; I use it all the time when I'm working with my iridium and silver complexes. Its the best way to guarantee your glassware is clean. Just be sure...
by jameswilliamogle
Sat Jul 19, 2008 4:26 am UTC
Forum: Science
Topic: Your First Publication
Replies: 42
Views: 5047

Re: Your First Publication

My first paper went to Chemical Communications as 2nd author, which is a secondary tier publication for organic and some other chemistries in general (excluding Science and/or Nature, since they're more general than chemistry; its just my opinion, though). We were examining a (then) new class of sub...
by jameswilliamogle
Thu Jul 17, 2008 7:08 pm UTC
Forum: Science
Topic: Variance in Human Senses
Replies: 18
Views: 4211

Re: Variance in Human Senses

I have pretty good vision. Everyone on both sides of my family need corrective lenses, but I never have. I can usually read billboards from about a mile away, can read fine print on signs from far away. Its the milkman conspiracy theory (involving my mom: not really, but its something funny I like t...
by jameswilliamogle
Thu Jul 10, 2008 9:16 pm UTC
Forum: Science
Topic: metallurgy in zero gravity
Replies: 20
Views: 5096

Re: metallurgy in zero gravity

If you started with really pure materials and weren't exposing the metals to oxygen, I'm not sure you'd get that much slag, anyways. It seems to me that it would be easier to not have oxygen around in space. It might be interesting to get new phases for metals, which a lot of materials chemists are ...
by jameswilliamogle
Thu Jul 10, 2008 9:05 pm UTC
Forum: Science
Topic: Why does red Fanta Exotic turn yellow with these chemicals?
Replies: 34
Views: 9240

Re: Why does red Fanta Exotic turn yellow with these chemicals?

By knowing the concentration of your base / acid, you should be able to figure the exact pH of the indicator. You'll need either the buret, or very dilute base / acid and a grad cylinder for this, though.
by jameswilliamogle
Thu Jul 10, 2008 9:01 pm UTC
Forum: Science
Topic: Crazy Inorganic Chem
Replies: 4
Views: 1366

Re: Crazy Inorganic Chem

Neil Bartlett's XeF(n) series (he's a very nice guy, btw, and seemed pretty educated in 17th century warfare as well as chemistry; very polite table manners, as well). The late Al Cotton's quadruple bond complexes (he may have been an old curmudgeon, but nobody could deny his intellect; yes, I know,...
by jameswilliamogle
Wed Jul 09, 2008 1:17 am UTC
Forum: Science
Topic: Imaginary space solutions to the Shrodinger equation?
Replies: 6
Views: 1242

Re: Imaginary space solutions to the Shrodinger equation?

This answered my question fairly well; I was wondering if one could solve backwards for a complex point in space using the Schrodinger equation (ie, was wondering if the mathematical model had symmetry in real and complex space of some sort). Thanks, folks!
by jameswilliamogle
Tue Jul 08, 2008 9:16 pm UTC
Forum: Science
Topic: Imaginary space solutions to the Shrodinger equation?
Replies: 6
Views: 1242

Imaginary space solutions to the Shrodinger equation?

I was wondering if there were imaginary vectors which gave real solutions in the Schrodinger equations. I know that Heisenburg decided early on to throw out all the data that scientists of the day couldn't see/measure; I was wondering after reading about antimatter's theorization by Dirac (on this f...
by jameswilliamogle
Mon Jul 07, 2008 4:05 pm UTC
Forum: Science
Topic: Why does red Fanta Exotic turn yellow with these chemicals?
Replies: 34
Views: 9240

Re: Why does red Fanta Exotic turn yellow with these chemicals?

Bobber, I hope you are removing the carbonic acid from the Fanta before doing the titrations if you are looking for some real use for the indicator. Just let it go flat before titrating (leave it open overnight). I agree that NaOH and HCl are the way to go in this experiment: since NaCl is probably ...
by jameswilliamogle
Sun Jun 29, 2008 11:28 pm UTC
Forum: Science
Topic: Incident with Richard Lenksi and a Creationist
Replies: 7
Views: 1949

Re: Incident with Richard Lenksi and a Creationist

My favorite part: "In other words, it’s not that we claim to have glimpsed “a unicorn in the garden” – we have a whole population of them living in my lab! [ http://en.wikipedia.org/wiki/The_Unicorn_in_the_Garden] And lest you accuse me further of fraud, I do not literally mean that we have uni...
by jameswilliamogle
Tue Jun 24, 2008 9:41 am UTC
Forum: Science
Topic: Physical and Computational Chemistry Questions
Replies: 4
Views: 1101

Re: Physical and Computational Chemistry Questions

By tha way, good luck with your defense. I'm sure it'll go fine. Your advisor won't let you defend unless you are ready, so you must be ready (how do you like that circular reasoning?). Besides, at this point, you know more about your project than anyone else in the whole world. Thanks for that, an...
by jameswilliamogle
Mon Jun 23, 2008 5:09 pm UTC
Forum: Science
Topic: Physical and Computational Chemistry Questions
Replies: 4
Views: 1101

Re: Physical and Computational Chemistry Questions

I'm working with Iridium +1. Spin state: I'd have to get back to you; its been too long since advanced inorganic. These are analogous to Crabtree's catalyst, though. Thanks for that reference (could you give me the keywords or co-authors so I can look it up better? I appreciate it! EDIT: is it J Bio...
by jameswilliamogle
Sun Jun 22, 2008 7:48 pm UTC
Forum: Science
Topic: Why does red Fanta Exotic turn yellow with these chemicals?
Replies: 34
Views: 9240

Re: Why does red Fanta Exotic turn yellow with these chemicals?

No, seperatory funnels usually are made that way. They can get fairly expensive, though, so I was recomending an alternative. Nice experiment there. You probably wouldn't see a precipitate, as typical dyes are used in very small quantities in final formulations (think 0.01% or lower), but you might ...
by jameswilliamogle
Fri Jun 20, 2008 5:27 pm UTC
Forum: Science
Topic: Why does red Fanta Exotic turn yellow with these chemicals?
Replies: 34
Views: 9240

Re: Why does red Fanta Exotic turn yellow with these chemicals?

Scraping isn't exactly the term I'd use, but yeah, you want to separate the two layers. The ideal glassware for this is a seperatory funnel . Try this: buy a plastic jug, like the kind used for holding tea or lemonade. Buy a screw-on spigot of some kind in the plumbing section of your hardware store...
by jameswilliamogle
Fri Jun 20, 2008 2:31 am UTC
Forum: Science
Topic: Why does red Fanta Exotic turn yellow with these chemicals?
Replies: 34
Views: 9240

Re: Why does red Fanta Exotic turn yellow with these chemicals?

Heptane would work well, acetone would not because acetone is polar and miscible with water. The (possible) resulting magnesium salts might not be soluble in heptane, though. I know BODIPY dyes and Texas Red isn't. I remember the Burgess group, whom develop a lot of dyes for biochem purposes, were ...
by jameswilliamogle
Thu Jun 19, 2008 2:55 am UTC
Forum: Science
Topic: Bernard's Lolly
Replies: 18
Views: 3356

Re: Bernard's Lolly

I've seen people play w/ dry ice in their mouth, so I don't see much of a problem. The key w/ dry ice is to keep moving it around in the spittle in your mouth so that you don't over chill any section. I've also heard about the same trick w/ liquid nitrogen, though I don't want to try either.
by jameswilliamogle
Thu Jun 19, 2008 12:07 am UTC
Forum: Science
Topic: Odd organic chem problem
Replies: 22
Views: 2382

Re: Odd organic chem problem

Carbon Tet is pretty stable. That's why you'd use it as a solvent. Now, of course, we use the less-dangerous-but-still-stable CHCl3. I've seen it for some chemical tests, for sesquiterpene analysis, for example (when I looked to see if what I knew had changed), but does it work for bromination of r...
by jameswilliamogle
Wed Jun 18, 2008 9:07 pm UTC
Forum: Science
Topic: Why does red Fanta Exotic turn yellow with these chemicals?
Replies: 34
Views: 9240

Re: Why does red Fanta Exotic turn yellow with these chemicals?

Thanks; yes you are correct on that second link. One other thing: these are the ingredients for UK Red Fanta. It might be made with a different formulation here in the states. If that's the case, then what I posted may not follow, however almost all the aqueous dyes have sulfonic salt groups in them...
by jameswilliamogle
Wed Jun 18, 2008 5:09 pm UTC
Forum: Science
Topic: A "Second Space Race"?
Replies: 9
Views: 1840

Re: A "Second Space Race"?

Maybe the poor would adopt Jonathan Swift's methods and start piling dead children on top of each other to build a tower to reach LEO? Yeah... space is not the answer for overpopulation on earth. It is an answer to continue Manifest Destiny without causing any more wars. Chemistry has done a lot to ...
by jameswilliamogle
Wed Jun 18, 2008 4:59 pm UTC
Forum: Science
Topic: Twin paradox: a question
Replies: 18
Views: 4514

Re: Twin paradox: a question

I was curious how transmitted information works when traveling both towards and away from the transmission source at very fast speeds. Other than the blue shift, would someone traveling towards earth with a clear signal (say, from a laser beam or some-such) see broadcasts in a fast forward mode? Wou...
by jameswilliamogle
Wed Jun 18, 2008 3:32 pm UTC
Forum: Science
Topic: Applied chemistry - a fat issue
Replies: 9
Views: 1515

Re: Applied chemistry - a fat issue

Or beg some dichloromethane off a chemist :roll: read up on the subject before you consider it, this wikipedia article has most of the things you'll need to know before using i would advise the NaOH first, watch out for burns (especially when handeling pellets of this stuff, i found out the hard wa...
by jameswilliamogle
Wed Jun 18, 2008 2:14 pm UTC
Forum: Science
Topic: Why does red Fanta Exotic turn yellow with these chemicals?
Replies: 34
Views: 9240

Re: Why does red Fanta Exotic turn yellow with these chemicals?

From UK's Coke website: http://www.coca-cola.co.uk/yourhealth/whats%5Fin%5Four%5Fdrinks/ Red Fanta: carbonated water, sugar, orange fruit from concentrate (3%), citric acid, flavourings, preservative (E211), stabilisers (E445, E412, acacia gum), colours (E104, E122, E124) The colors are: E104, Quino...
by jameswilliamogle
Wed Jun 18, 2008 12:34 pm UTC
Forum: Science
Topic: Applied chemistry - a fat issue
Replies: 9
Views: 1515

Re: Applied chemistry - a fat issue

Dichloromethane isn't such a great idea, but you could probably buy mineral spirits at your local hardware store. Its a mixture of hexanes, butanols, and other mixtures that I'd bet money would work. Other than that, the soda idea is a good one.
by jameswilliamogle
Wed Jun 18, 2008 12:01 am UTC
Forum: Science
Topic: Twin paradox: a question
Replies: 18
Views: 4514

Re: Twin paradox: a question

Something I've always wondered about. Say an alien sees that first Hitler broadcast. It gets in its spaceship, flying fast to earth. If they had the appropriate equipment to accept radio/tv broadcasts, and was traveling at say half the speed of light, would they be able to "catch up" so th...
by jameswilliamogle
Tue Jun 17, 2008 11:18 pm UTC
Forum: Science
Topic: Physical and Computational Chemistry Questions
Replies: 4
Views: 1101

Physical and Computational Chemistry Questions

I'm running a set of calculations on some organometallic compounds I've made and I'm curious about how accurate the calculations to determine the energy gap between the HOMO/LUMO are in general in the literature using Gaussian. Its a totally new field for me, so thought I'd ask here (why not?). The ...
by jameswilliamogle
Tue Jun 17, 2008 9:51 pm UTC
Forum: Science
Topic: Odd organic chem problem
Replies: 22
Views: 2382

Re: Odd organic chem problem

I've been told that the carbon tet is sufficient to keep bromination limited to mono-bromination products before. I don't know why; I think it acts as a deactivator of the radical intermediates in some fashion. I know from experience that other solvents will give mixed bromine products. As was menti...

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