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via Chemistry Cat
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Welcome Back to CLT!
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via Joseph Farris
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Welcome Back to CLT!
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This page says this originally appeared in a mock calendar diary for 1997. I don’t know the original source.
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A molecule with one stereocenter has one pair of stereoisomers: a pair of enantiomers.
A molecule with two stereocenters has 6 pairs of stereoisomers: 4 pairs of diastereomers and 2 pairs of enantiomers.
Given that, how many stereopairs does a molecule with 3 stereocenters have (assume no meso)? How many pairs of diastereomers? How many pairs of enantiomers?
Can you come up with formulas for the number of total stereopairs, diastereomer pairs, and enantiomer pairs given a molecule with n stereocenters?
First one with the right answer is the coolest!
For more fun, don’t just reply when you have the right answer. Reply with some initial guesses, first approximations, and thought process. A good discussion is more fun than one person posting the right answer
WARNING: The (a) correct answer is posted below. There are other correct general formulas I’ve seen. If you still want to play along, don’t read the comments. Try it on your own first, then read the comments.
To see more creative NanoKids, click here
Final installment today: Nanimals and NanoThings. These are all structures drawn by my spring 2012 organic chemistry class. Full background here.
(Note: some captions have been edited to remove class/school specific references)
(Click images to enlarge)
Nanimals
NanoThings
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via Calvin and Hobbes
Note: This comic has been altered and was originally about math. I changed the word ‘math’ to ‘chemistry’ and ‘numbers’ to ‘chemicals.’
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In my last post I heaped praise on “The Wonderful Life of Elements“. Well, how fickle I am. Within three short days I have a new favourite. Now don’t let the title ”Chemical Shifts and Coupling Constants for Silicon-29” (Gupta et al.) nor the drab cover put you off. This book is undoubtably a work of genius.
I’ll let the Amazon reviews speak for themselves. After all I certainly can’t do a better job of demonstrating how undeniably useful this book is. Take Mr. E. Welsby’s glowing testimonial for instance:
At the Boston inst of chemical tech we’ve been looking for ways to expand silicon usage for construction, thanks for the bonding information of this book we’ve successfully managed to merge silicon atoms with that of a small gibbon, who can now phase his physical body between carbon and silicon (sand) at will.
and the equally enthusiastic praise from K.V. Trout:
I don’t know how they came up with the idea to do a book on Chemical Shifts and Coupling Constants for Silicon-29, but I would have never thought it would be worth this much money. These guys are visionaries, because at a time when the rest of us were watching sit-coms and wondering who was going to win American Idol, these guys were gathering together the numerical data and functional relationships of various technical and scientific kadoodleybobs.
I bow to their marketing genius as well as their forward acuity in the sci-market arena. Their...
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via Fortune St. Cartoons
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To see more creative NanoKids, click here
In part 2 of 3, this week we highlight NanoPeople doing NanoThings. These are all structures drawn by my spring 2012 organic chemistry class. Full background here.
Next week: Nanimals and NanoThings!
(Note: some captions have been edited to remove class/school specific references)
(Click images to enlarge)
NanoPeople
This week’s lab highlight: I received 1 gram of water in the mail. This delivery was exciting because it contained a tiny brown bottle of 97% 18O water that would allow me to perform an experiment to appease a reviewer. The excitement teetered into childlike glee once I saw the size of the box, made it through the Russian Nesting Doll packaging, and finally reached the gram of water inside. Here’s a picture-book version of the experience:
To see more creative NanoKids, click here
Last year, I gave my students the opportunity to earn a very small amount of extra credit by making a few creative NanoKids in the style of Jim Tour‘s NanoPutians. I encouraged them to be as creative and unique as possible – but they can’t break the octet rule. Every molecule must adhere to its normal valence. Like last year, over the next 3 weeks, I’ll be hanging my student’s creations on my virtual refrigerator door that is this blog space This week’s installment is subtitled NanoSports and Nano’Tainment. The Nano’Tainment category is NanoKids featured in movies, TV, or video games.
Next week: NanoPeople Doing NanoThings!
(Note: some captions have been edited to remove class/school specific references)
(Click images to enlarge)
NanoSports:
Nano’Tainment:
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via Off the Mark
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RT @NobyLeong I've become the resident native English speaker in my lab. Really testing my grammar skillz #RealTimeChem #PhDchat →
MT @ChemConfusion Just started an account in aid of the fight against #chemophobia and related quackery. In need of followers. RT? #Science →
@DocTHop Thanks - will take a look. →
@snapdragon830 aww, thank you! →
6 Women Scientists Who Were Snubbed Due to Sexism http://t.co/q05Fx4OsZP →
@matthewherper @DShaywitz @oli_rayner true. bob beall will say putting pricing on table is non-starter for cos. but model must evolve, no? →
