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Author: Subject: What is the COOLEST reaction you've ever seen/done?
forgottenpassword
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[*] posted on 24-3-2014 at 07:58


Quote: Originally posted by Zyklonb  
I just fond out that Walmart and Kroger has solid carbon dioxide. Not sure if you can get it, but it's quite easy to find, and much colder than ice water with a chloride salt.
I'm sure I could find it somewhere, but how long would it last? I assume that I couldn't store it for any length of time. -40 C is not too bad and the ingredients are easily acquired and stored. I imagine that most reactions done at -78 C could also be done equally well at -40 C. Perhaps addition rates would have to be lowered slightly but that's not much of a problem.
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Zyklon-A
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[*] posted on 24-3-2014 at 08:04


Quote: Originally posted by forgottenpassword  
Quote: Originally posted by Zyklonb  
I just fond out that Walmart and Kroger has solid carbon dioxide. Not sure if you can get it, but it's quite easy to find, and much colder than ice water with a chloride salt.
I'm sure I could find it somewhere, but how long would it last? I assume that I couldn't store it for any length of time. -40 C is not too bad and the ingredients are easily acquired and stored. I imagine that most reactions done at -78 C could also be done equally well at -40 C. Perhaps addition rates would have to be lowered slightly but that's not much of a problem.

I have not handled dry ice much, depending on the size of the block and where you store it, it should last for hours.
See this:http://www.eatbydate.com/other/dry-ice/




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MrHomeScientist
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[*] posted on 24-3-2014 at 09:19


If you have it in a well-insulated container as a large solid block (as opposed to small pellets), it can last a day or two. I've had success with a cooler packed with bubble wrap and taped closed with duct tape. Don't put it in a tightly sealed container of course, because of pressure buildup! I've heard it's a bad idea to store it in your freezer too, because the pressure increase can damage the fridge or pop the door open. Technically you can handle it without insulating gloves as long as you keep it moving around, but I really don't recommend it.

On topic, my favorite reaction of all time is the barking dog. I've done the 'real' version with carbon disulfide many times, but when the sulfur dioxide gas it produces started bothering my throat I switched to a safe version. It replaces the CS2 with methanol and boric acid. This changes the flame color to green, and seems to greatly speed up the reaction too. Woelen and I talked about it in a thread somewhere, and credit to him for the idea.
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nb198
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[*] posted on 24-3-2014 at 17:34


Quote: Originally posted by thesmug  
Mercury thiocyanate decomposition with heat, thermite (FeO and Al powder). So hard to choose between the two!


Hey, I made a synthesis video about the mercury thiocyanate! Maybe you'll like it.

Link

[Edited on 25-3-2014 by nb198]
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[*] posted on 24-3-2014 at 18:57


Quote: Originally posted by thesmug  
Mercury thiocyanate decomposition with heat, thermite (FeO and Al powder). So hard to choose between the two!


Really, FeO/Al thermite suits you? I'm into more exotic thermites, especially Al/MnO2.

There's this one luminous clock reaction which is really unusual. I believe it was on the Periodic Table of Videos channel. I myself haven't seen too many cool reactions, but I'd like to burn ytterbium and samarium, produce reduced europium compounds, and perform the iodine clock reaction. Or better yet, invent a new type of clock reaction.

Of the reactions I have seen, I particularly like the chemical chameleon with peroxide and burning magnesium. Copper complexation is also quite interesting.




At the end of the day, simulating atoms doesn't beat working with the real things...
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Zyklon-A
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[*] posted on 25-3-2014 at 05:44


Copper oxide thermite, copper carbonate thermite and copper sulfate thermite (all with aluminum as reducer.)
Copper metal flash powder: 4Cu + KClO4 → 4CuO + KCl.
I haven't done this one yet, but Botanist told me about it, and I will do it whenever I can get more copper sulfate. (To make copper powder: CuSO4(aq) + Al → Al2[/sub(SO4)3 + Cu.)




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[*] posted on 26-3-2014 at 08:25


Quote: Originally posted by Zyklonb  

I haven't done this one yet, but Botanist told me about it, and I will do it whenever I can get more copper sulfate. (To make copper powder: CuSO4(aq) + Al → Al2[/sub(SO4)3 + Cu.)


Yeah, we did a series of copper related reactions in chemistry class for our midterm lab, starting with copper wire, and eventually ending with copper powder by that method, except we used zinc instead of aluminum to replace it. That was pretty cool, and one of the reasons that I decided to start doing my own experiments. Even though I've always been interested in chemistry, that lab probably catalyzed my decision to do more than just read about it.
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[*] posted on 26-3-2014 at 09:10


Quote: Originally posted by zts16  
Yeah, we did a series of copper related reactions in chemistry class for our midterm lab, starting with copper wire, and eventually ending with copper powder by that method, except we used zinc instead of aluminum to replace it.


Does every college/university in North America do a version of that lab? I've attended two and taught at four, and I don't recall any college not doing that one...




Please remember: "Filtrate" is not a verb.
Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
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[*] posted on 26-3-2014 at 09:46


Well maybe so, but this is in high school!
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Steam
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[*] posted on 26-3-2014 at 14:49


Probably the decompression of Iron Oxalate under heat, then poring out the pyrophoric iron!

or the reaction of bromine with aluminium!




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[*] posted on 5-4-2014 at 20:46


Probably burning potassium picrate or a mixture of ammonium perchlorate, charcoal, and sodium benzoate. For some reason it burns with a very bright yellow flame.
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Oscilllator
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[*] posted on 5-4-2014 at 21:11


The other day I ate some methylene blue. It turns your urine an incredible bright blue-green colour!



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[*] posted on 5-4-2014 at 21:29


How much, Oscillator?
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[*] posted on 5-4-2014 at 22:18


Try CS2 vapors and N2O gas in a measuring cylender
Very beautiful and produce a very nice blue light
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[*] posted on 6-1-2015 at 05:50


The Beloisov-Zhabotinsky reaction can be absolutely amazing when done with exactly the right concentrations/dyes to make growing concentric rings. Disturbing the system with a toothpick causes entirely different patterns to occur almost organically.


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[*] posted on 6-1-2015 at 06:20


P-nitroaniline and hot H2SO4.
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[*] posted on 6-1-2015 at 07:24


I forgot about that one! Got some aniline coming so perhaps a small synthesis of p-nitroaniline is in order :P
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[*] posted on 6-1-2015 at 07:52


Quote: Originally posted by MrHomeScientist  
If you have it in a well-insulated container as a large solid block (as opposed to small pellets), it can last a day or two. I've had success with a cooler packed with bubble wrap and taped closed with duct tape.


The best cheap commonly available insulations I am aware of are foil-faced polyisocyanurate (PIR*) rigid panel, and expanded polyurethane rigid panel. I find the foil PIR panel cheaply in my local Box Box Hardware stores. It would be interesting to takes a sheet of this stuff, cut it up and duck tape it into a multi-layer dry ice box to see how long a standard dry ice block will last.

*Not an obvious acronym. I don't know why it is not PIC.
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[*] posted on 6-1-2015 at 16:36


Silver tree is quite nice

silver nitrate and mercury



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[*] posted on 6-1-2015 at 18:18


My students always ask for sodium and sulfur. PPE essential. Keep quantities very small (0.05g of Na) and grind in pestle and mortar. Makes 'em jump.
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[*] posted on 6-1-2015 at 19:19


Burning magnesium, manganese heptoxide and methanol, and decomposition of ferrous oxalate. I also test paint for lead (for my brother's projects), and I enjoy precipitating lead (II) sulfide with sodium sulfide, after the sample is dissolved in nitric acid.



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[*] posted on 7-1-2015 at 05:14


The coolest reaction I did was when I was a student.
I prepared bis toluene chromium. Cr(C7H8)2
The kit was mainly a large round flask surrounded by liquid nitrogen and containing a tungsten coil and connections so it could be heated by the passage of an electric current.

I placed a piece of chromium in the coil and evacuated the flask then started to leak a slow stream of toluene vapour into the flask- when it hit the walls it froze instantly.
I then connected the coil to a power supply and fed about a kilowatt of power into so it glowed white hot- not quite hot enough to melt the chromium, but hot enough that it sublimed into the vacuum.

On the walls of the flask the chromium and toluene co-condensed to form a greyish mixture.

Once the experiment had run for a few hours (during which my colleague and I poured several gallons of nitrogen into the cooling bath to keep it cool) I disconnected the power, and let the flask warm up again.
As the toluene melted it reacted with the chromium atoms that were stuck into the frozen matrix to produce the desired Cr[0] complex.

I'd say that the melting point of toluene -95C is pretty cool for working with individual Cr atoms.


[Edited on 7-1-15 by unionised]
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[*] posted on 10-1-2015 at 15:38


Taking a solution of calcium chloride and adding conc sulphuric acid and watching calcium sulphate drop out snow white onto the bottom of the beaker, it was simple and easy but there was something about watching a solid of one substance start to appear from a liquid of another.



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[*] posted on 11-1-2015 at 00:14
Youtube has a wealth of practical demonstrations


http://www.youtube.com/watch?v=FofPjj7v414
http://www.youtube.com/watch?v=0KFAoqODZok
http://www.youtube.com/watch?v=hGn7aSe8e6w
https://www.youtube.com/watch?v=nadpcadav1I

I had the thought what would one of those color changing ' clock ' mixtures look like if it were to be made into a sudsey foam.

This is remarkable for the ease of preparation of a non-Newtonian fluid.
http://www.youtube.com/watch?v=_0J4dRqg7CE
Casein extraction from milk. Here's a thought, what about mixing this with the starch made above. Bullet proof properties ? Hmm.
http://www.youtube.com/watch?v=VFvik_THcNQ


.
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[*] posted on 11-1-2015 at 12:29


Quote: Originally posted by franklyn  
http://www.youtube.com/watch?v=FofPjj7v414
http://www.youtube.com/watch?v=0KFAoqODZok
http://www.youtube.com/watch?v=hGn7aSe8e6w
https://www.youtube.com/watch?v=nadpcadav1I

I had the thought what would one of those color changing ' clock ' mixtures look like if it were to be made into a sudsey foam.

This is remarkable for the ease of preparation of a non-Newtonian fluid.
http://www.youtube.com/watch?v=_0J4dRqg7CE
Casein extraction from milk. Here's a thought, what about mixing this with the starch made above. Bullet proof properties ? Hmm.
http://www.youtube.com/watch?v=VFvik_THcNQ


.


I thought the oscillating foam idea was too cool to not attempt. The first attempt was a fail, it was the Belousov-Zhabotinsky reaction with ferroin as the indicator. On a test tube scale both reagents were prepared and in one tube was added half a drop of Sunlight soap. After mixing both reagents together the tube was sealed and shaken violently to create suds. The mix stayed red but did not change colors, it did however do the usual slow production of bubbles accompanied by the bromine odor.

Another attempt was done but this time using methyl cellulose to thicken the mix and hopefully get color changing foam. It seems to work. A lot of ferroin is needed to make the bubbles appear colored and foam is really hard to produce even by shaking the tube hard... (Methyl cellulose isn't soap after all) The color changes aren't very dramatic either. Now having had some success I'll try and tweak the mixes to see if something else works better and post some pictures or video! Neat idea Franklyn!
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