Completing the Reagent Table for Organic Chemistry Lab Notebook
Click here for a blank reagent table handout: http://www.csupomona.edu Get some practice in calculating moles, determining limiting reactant, calculating the theoretical yield (TY) of the product and calculating molar equivalents. Click here for the answer key: http://www.csupomona.edu
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Completing the Reagent Table for Organic Chemistry Lab Notebook - Video
Over the last few months, the RSC has been running a competition, asking people to try and explain the Mpemba effect – why does hot water freeze faster than cold water?
The effect has puzzled scientists throughout history, but was most recently brought to light again in the 1960s by Eristo Mpemba, a student from Tanzania who challenged the received wisdom of his teachers and ended up writing a paper on the phenomenon with a local university professor, Denis Osborne.
Over 22,000 people from 122 countries submitted their theories and potential explanations for the effect, ranging from the hare-brained and humorous to more thorough and considered arguments. These entries were then whittled down to 11 by an international panel of judges and a public vote.
On Friday of last week, the RSC held an awards ceremony to announce the winner. Mpemba himself flew in from Tanzania to attend, and Osborne also joined the gathering at Burlington House in London.
And the winner? Nikola Bregovic, a PhD student in physical chemistry at the University of Zagreb, Croatia. Not satisfied with theory and conjecture, Bregovic took to both the library and the lab, performing his own experiments and research to try and work out which of the many factors proposed to cause the Mpemba effect were significant.
You can read his submission in full in this paper, but it appears that the biggest factor affecting whether hot water will freeze faster than cold water is the degree to which the water can be supercooled – cooled below its nominal freezing point without actually freezing. Under certain conditions, it appears that heating the water can raise the nucleation temperature of the water, meaning that it effectively freezes at a higher temperature than the cold water. Convection – which will be more pronounced in the hot water – also plays a part, and the underlying fundamental problems underline the complexity of water’s chemistry. As Bregovic says in his conclusion, ‘Once again this small, simple molecule amazes and intrigues us with its magic.’
And how will he spend the £1000 prize money? A night out with his supporters and labmates to celebrate, and a trip to the mountains in the spring with the leftovers.
Source:
http://prospect.rsc.org/blogs/cw/2013/01/14/running-hot-and-cold-but-which-will-freeze-first/
Hot John Abraham talks about His Chemistry with Saif Ali Khan in Race 2 -Promotion of "Race 2"
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Hot John Abraham talks about His Chemistry with Saif Ali Khan in Race 2 -Promotion of "Race 2" - Video
IIT JEE EXAM TEMPERAMENT PHYSICS, Chemistry maths IIT JEE 11th 12th CBSE
----------------------------- Subscribe: http://www.youtube.com Youtube: http://www.youtube.com Website: http://www.freeshiksha.co.in Facebook http://www.facebook.com BloG: freeshikshablog.blogspot.in Gmail realpredictors@gmail.com -------------------------- How to curb your nerves during IIT JEE. How not to get nervous while sitting for the exam. How to tackle the anxiety during IIT JEE.
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IIT JEE EXAM TEMPERAMENT PHYSICS, Chemistry maths IIT JEE 11th 12th CBSE - Video
Hot Sexy Deepika Padukone talks about "Hot Chemistry" in Race 2, "Love Aaj Kal" and "Cocktail"
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Hot Sexy Deepika Padukone talks about "Hot Chemistry" in Race 2, "Love Aaj Kal" and "Cocktail" - Video
Varun Dhavan Alia Bhatt Showing Off Their Chemistry At 19th Lions Gold Awards!!
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Varun Dhavan
Chem C3000 Chemistry Sets Features
Visit childrenstoysreviews.com to get this great toy for less and read comprehensive toy reviews for kids of all ages and get great deals. Thanks for visiting!
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Chem C3000 Chemistry Sets Features - Video
Boredom in Chemistry
Got bored in class with nothing today so we decided why not make a video
By: Bradley Gilmore
Molecular Geometry Chemistry Song (Lazy Song Parody)
Today I don #39;t feel like doing chemistry, Dimensional Analysis was the best, Chapter 7 is really tough, One problem and I #39;ve had enough, Today I don #39;t feel like doing chemistry. Got Ax2, linear, 180 And Ax2e3 is the same a little shady, Because those go in a straight line. Ax3 Triangle Planar 120 Ax2e is bent in a my mente (mind in spanish) Its a little less than the other Yes I got it, I got it, I Think I understand CHORUS Ax4 tetrahedral 109.5 Ax3e Triangle Pyramidral, a little dive, Ax2e2 bent even less. Ax5 angles 9(0), 12(0) 180, and seesaw is the same cuz theres not alot of spacey, but eh E makes it less than the other. Square pyramidal, planar, and octahedral, are 90, 180, which should be illegal, Ax5e is the only one thats less, Yes I got it, I got it I think I understand CHORUS Now I hope you understand When you see it all first hand, Dont Fail. No I ain #39;t gonna fail this test, Yeah I #39;m gonna go and do my best Yeah. CHORUS
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Molecular Geometry Chemistry Song (Lazy Song Parody) - Video
Fireworks: The Chemistry in the Color
Get more pyrotechnic chemistry at acswebinars.org
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Fireworks: The Chemistry in the Color - Video
Award winning Short Film "CHEMISTRY WORKOUT AGALA" - Naalaya Iyakkunar
how students suffer from chemistry and its teacher.!!
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Award winning Short Film "CHEMISTRY WORKOUT AGALA" - Naalaya Iyakkunar - Video
Organic chemistry lecture turns into a whole class dance party Syracuse University
Lecture on Bending and Molecule motion taught by a hilarious professor turns into a rager
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Copy of Chemistry Impact
Introduction to Chemistry IMPACT
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Copy of Chemistry Impact - Video
Chemistry Project; Chemistry of Red Bull.
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Chemistry Project; Chemistry of Red Bull. - Video
Marie Curie Chemistry Project
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Marie Curie Chemistry Project - Video
Cooking Chemistry with Pat and Jimmy
Mrs. Pompetti 3rd Block Class, Chapter Challenge
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Cooking Chemistry with Pat and Jimmy - Video
CHEMISTRY- De$ean Ft. J Czar
off on our new mixtape, Presidential Lifestyle
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CHEMISTRY- De$ean Ft. J Czar - Video
The Twilight Zone: The Joy of Drinking Chemistry (Part 1)
A classy journey through the world of chemistry!
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The Twilight Zone: The Joy of Drinking
Tyson #39;s Chemistry Video 2012-13 Hand Warmers
animation of how hot hands hand warmers work
By: Tyson Bird