Mendelejev

Could someone explain me why glycine isn't soluble in organic solvents. My prof said this today !! If you take some pure glycine in water it should be a zwitterion, so there would be positive and negative charges. That means it would be very soluble in water. Secondly, the R-group in glycine is -H, not very apolar ! But organic solvents can be polar (methanol, ethanol, ...) and apolar (heptane, ...) !! So, it would be soluble in methanol and ethanol, but not in heptane. Then, why does he says it's NOT soluble at all in organic solvents, included methanol and ethanol ???

Mmm, converting it to a halide ... with hydrochloric acid ? would that work ? Eu2O3 + 6 HCl -> 2 EuCl3 + 3 H20 This would be a good solution for electrolysis.

I've just got the oxides of the lanthanides. Could I make some europium (for example) with europium(III)oxide (with electrolysis or ...) ??? Or would a thermite reaction be a possible method ?

OR if you just look a little too long at your burning magnesium

About a week ago, I bought a UV torch ! I know I can use it for my TLC plates and it would also be nice for some of my lanthanidesalts. Europiumsalts should emit red light, terbiumsalts green, and lutetium blew ! But i'm still searching for other fun experiments with UV-light. Maybe you could help me

Today Louis-Nicolas Vauquelin would be 242 years old (He's born in 1763) He has discovered chromium (Cr, element 24) and beryllium (Be, 4). I found that imprtant enough to let you know !!! http://www.newadvent.org/cathen/15315b.htm Here's a link to some more information about Louis-Nicolas.

Do you have some sites with 3D representations of the periodic table ??? (A bit like visual elements, see above) !! I love the idea of representing the table as a landscape, a Periodic World !! For me, it's my dreamworld ! I know every spot and I can travel from element to element. You have the desert of metals with mostley metallic looks, but you also have the beautiful countries of the non-metals. You have the province of the alkalimetals, where you could better hide is it rains. Somwhere in the south you have an island with the more exotic metals, but watch out where you go, cause you could come in regions that could kill you in a few seconds because of their reactivity. I LOVE to travel in the fantastic world of the elements. Most people don't understand me, but for me it's paradise !!! (Peter Atkins, prof. chemistry in Oxford I think, has written a great book about his trip in this world, 'The periodic kingdom of the elements' ... it's my favourite chemistry book. I read it almost 15 times, again and again, and again ) So if anyone has some sites about this subject, please let me know. Thanx

I've just found a new shockwave application of the periodic table. Very nice 'design' periodic table where you can compare reactivity, EN, etc. *** http://loop1.aiga.org/common/modules/display/dsp_ContentTemplate01b.cfm?ContentID=130&CreateTemplate=0&NavType=SiblingCategory#

Woow, great explanation !!! Very nice ! I'll try to remember it for later, when I've became chemistry prof

Element no. 115 and 113 are also created ! http://www.radiochemistry.org/periodictable/elements/113.html

Nope, but go check http://genchem.chem.wisc.edu/lab/PTL/PTL/Elements/Cs/Cs.html Nice video of Cesium in Water

I was thinking ... why not make a thread where everyone can put great sites about the periodic table. Here are already some great sites. (**** = EXTREMELY GOOD, *** = VERY GOOD, ** = GOOD, * = NORMAL) **** http://www.vanderkrogt.net/elements/index.html Fantastic site !! You will find this site useful not only for the origins (etymology) of element names, but also for translations of each element name into numerous other languages. **** http://homepage.mac.com/dtrapp/Elements/mineral.html Origins of the element names. Very nice !!!! **** http://www.element-collection.com/index.html The Most Beautiful Periodic Table Displays in the World ! Great site for element collectors. **** http://www.chemsoc.org/viselements/pages/page3.html FANTASTIC SITE !! Just visit it !!!!! **** http://www.theodoregray.com/PeriodicTable/index.html The Wooden Periodic Table Table ... Yes, it really is a table. What, How, Why ... go check the site !! *** http://www.chemtopics.com/elements.htm A periodic table. Information includes a picture of the element (when available), a short background description with some ethymology, and links to other sites containing additional background and data. *** http://www.ch.cam.ac.uk/misc/weii/ Based on the Best Selling Book THE ELEMENTS ! Periodic table with biological data, geological data, physical data, etc. *** http://www.chemistrycoach.com/periodic_tables.htm Huge list of links for periodic tables !! *** http://soundamerica.com/sounds/comedy/Tom_Lehrer/ *** http://www.casualhacker.net/tom.lehrer/evening.html#elements Two great sites about Tom Lehrer's Song of The Element. Just Listen and enjoy !!! *** http://chemlab.pc.maricopa.edu/periodic/default.html Very nice site with periodic table, and an interavtive table of isotopes *** http://www.uky.edu/Projects/Chemcomics/ Periodic table : Click on an element to see a list of comic book pages involving that element. ** http://superdeluxe.com/elemental/ Chemistry and poetry together as never before. Curious? Explore the Periodic Table of Elements you know and love — with a twist ! Click on your favorite element for a poem. ** http://genchem.chem.wisc.edu/lab/PTL/PTL/Elements/H/H.html Periodic Table Live ! Nice, with some movies about the reaction of the elements with air / water / acid / Base ** http://cwx.prenhall.com/petrucci/medialib/media_portfolio/10.html Some movies and animations illustrating the periodic trends, etc. ** http://www.ch.cam.ac.uk/SGTL/elements/ Periodic table, colored by atomic weight, number of isotopes, melting point, etc. ** http://www.anachem.umu.se/cgi-bin/pointer.exe?PeriodicTables List of links for Periodic Tables and Related Material. ** http://www.robresint.co.uk/default.asp?section=periodic A periodic table with quotations on the elements. ** http://www.areopagus.net/grkelements.htm A table of the elements with mythological influences, or at least have the Greek language to thank for their names ... this site knows all about it. * http://center.acs.org/periodic/tools/PT.html A periodic table. Nice Shockwave application. * http://www.apsidium.com/new_pt/newtab.htm New periodic table up to element 224 * http://nautilus.fis.uc.pt/st2.5/index-en.html A periodic table with a bit of history and biographies. * http://www.monroecc.edu/wusers/flanzafame/ClPerDates.pdf PDF file : the periodic table, colored by year of discovery ENJOY

Yes indeed !! With two taps, one for hydrogen and one for oxygen. Beautiful apparatus, but expensive

Yes, it will !! It will always turn into gas !!! That's why you should keep it in tubes.

You know, you could go fishing with carbide. Take a large can and fill it with carbide. Place the lid on the can en make some holes in it. Threw the can in the water... water goes in the can, reacts, gasses will form and after some seconds ... Kaboem. By the violent explosion, all the fish will come to the surface and can you catch them with a fishing net !!

http://web.lemoyne.edu/~giunta/week.html http://todayinsci.tripod.com/ http://schulen.eduhi.at/chemie/back.htm GREAT SITES ! Each day, you can visit the site and see what happened that day in the history of chemistry. Go look, and let me know what you think about it ! Example : Today 10 may 2005 In 1860, the discovery of the element caesium was announced by German chemists, Robert Bunsen and Gustav Robert Kirchoff to the Berlin Academy of Scientists. It was first noticed by its characteristic blue spectral lines, for which colour is was named.

Why UNIQUE ??

EBAY !!! You can find many Ebay-stores that sell Cs. (Emovendo - Smart Elements - etc.) Go see the thread "Sticky: So, you like to collect elements?" for more information on element-stores.

Yes, indeed, I was thinking to theoretically ! Maybe it would work, but you're right, the sodium metal formed, would react immediately with the water and would burn heavily. I also remember my profs words : "If you want chlorine, take the solution, it's cheaper and easier. But if you want sodium, you don't have a choice, you have to melt your NaCl" !! Too bad, it would have been nice if it worked with alkali metals !!! I would buy tons of salt and make my own Sodium

An equilibrium constant of a reaction A + B => C + D is K = [C]eq[D]eq / [A]eqeq So, in your case, it will be [sO2]eq [Cl2]eq / [sO2Cl2]eq If K > 10³ the reaction will be sponteneous and you will form C and D If K < 10-³ the reaction will not occur. C + D would react sponeneously to A + B, but not in the opposite direction If 10-³ < K < 10³ you have an equilibrium. Some of your ammount will convert to C + D but you will get an equilibrium with A, B, C, and D "At the higher temperature of 1250 K, the value of Kc is 85.3. If 0.152 moles of SO2Cl2(g), 0.336 moles of SO2(g), and 2.34 moles of Cl2(g) were placed in a 2.50 L flask at 1250 K, would the amount of SO2 increase or decrease as the reaction proceeded to equilibrium? Show your working." I think : Calculate the concentrations of SO2Cl2, SO2, Cl2 Calculate the reaction constant [sO2][Cl2] / [sO2CL2] and compare it with Kc = 85,3. If K < Kc SO2Cl2 will convert to SO2 and Cl2 (NOT COMPLETELY !!!) If K = Kc you have the equilibrium If K > Kc their is to much SO2 and Cl2 and they will react and form SO2Cl2 (again, not completely) So, I hope, what I just said was right ! Good luck

Exactly, maybe you better start with some less danger experiments, like the electrolysis of water into hydrogen and oxygen. It's a good experiment to start with becouse you can learn the principles of electrolysis and you will experience how difficult it can be. I did it some years ago and I have to say, that there were a lot of thing I didn't knew before I did that experiment (for example, adding some HCl, or NaCl to conduct current better, or how to store your gasses safely in test-tubes, ...) It's also easier to use a NaCl-solution in stead of NaCl-solid ! You won't have to melt it and use fire !! But I think that you will produce chlorine and hydrogen. Not sodium becouse it has an E° that is very small. Maybe if you use a very concentrated solution of NaCl, it will work (cf. Nernst-equation) !

I would guess that those elements would be solid ! Because almost all metals are solids (except mercury, cesium, or the radioactive elements : technetium, francium, radium, ...) ! And elements like element no. 107 are still metals ! Of course, when we talk about elements like element 115, 114, 112 etc. These elements are sooo radioactive that they only exist for picoseconds !!! And when they are made in cyclotrons by bombarding heavy nuclei the chance of making a nucleus with 115 protons is very small. So, when you have the chance of making such an element, you would have 10 nuclei, not much more. So, I wonder if we can speak of solids, liquids or gasses of metals that consist of only 10 atoms !!! Of course, we all hope that Atlantis (the island of stability) will be reached some day !! Then, we will have some of those heavy elements that will stay stable for some more time and maybe, then, we will see if these elements are solid, liquid, or gaseous.

Very nice explanation !!!! I would also advice to store the more danger / reactive / gaseous elements in sealed ampules. You can easily make them yourself. Just take a glass test-tube, put the sample in it and seal the other size by melting the glass. If you have some Mercury, you should seal it very well, becouse it evaporates. A few years ago I broke my mercury-bottle and all the mercury was on the floor of my chamber. A few days later, it was all gone ! And don't forget, the vapour is very very toxic !!!! So, take a bottle that you can close completely !

Well, my choice would be : The most important element FOR LIVING SPECIES : Carbon The most beautiful element : Cesium The most unique element : Mercury You know, I started this tread with the idea of finding a King of the elements. But it's clear that we can't chose ! And in fact, I find it better. Each element has his unique properties ! Gold = shining, yellow Mercury = a liquid metal Oxygen, carbond and hydrogen are so importent for life The alkali metals : so reactive with water Cesium : liquid, color of gold Fluorine : maybe the most reactive element of the periodic table ... I think, that's why element collecting is so fantastic !!! There are no borring elements ! We cannot chose a favourite but we certainly couldn't chose the most useless and borring element !!

GREAT ! I've also got my first elements today : Nickel, Lithium, Zinc, Mercury, Iron, Bismuth and Magnesium. And everything completely FREE !!!! But the samples are really small (about 3 mm large) !! So, I'm still looking for bigger samples.