Oscillating Reaction - Periodic Table of Videos
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- เผยแพร่เมื่อ 18 มิ.ย. 2014
- Example of a Belousov--Zhabotinsky reaction (or BZ reaction). Featuring Professor Martyn Poliakoff from the University of Nottingham. And the hands of Dr Samantha Tang!
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From the School of Chemistry at The University of Nottingham: bit.ly/NottChem
Periodic Videos films are by video journalist Brady Haran: www.bradyharan.com/
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THAT FREAKING THUMBNAIL
What a wonderful thumbnail
"But I was in the lab and I saw it happening. So it's okay."
brilliant :D
It's an amazing thing that such a soft spoken and proper man can have so much charisma.
"Long enough to keep going till you're bored" is the best length.
"I was in the lab so it's OK." I love this guy.
Omg lol, my Differential Calculus class required each person to do a project and apply differential equations to it; I am also a Chemistry major and discovered this reaction. And I presented a 40 minute presentation basically on the differential equations of the BZ reaction; thanks for uploading this!
I quite like the inductive stirrer you are using, it's quite interesting to see as a student of electronics.
Truly a Russian reaction: From vodka to borscht and back again!
why does it say "West Germany" on that laboratory cup? how old is it??
That's what I thought, too! At least 25 years...
1989 or older beaker.
Happy 6th anniversary, Periodic Videos!
Happy birthday!
Nice to come home from work and see my favorite professor.
Thank you!! have read about the BZ oscillation reaction, now I have seen it, fantastic!!
Yesssss a new show finally, This made my day !
The thumbnail is a bit unnerving. It makes Martyn look like a bug.
That final cut was perfectly timed, Mr. Haran.
Where she lost her voice?
Great vid! The most interesting thing about this reaction that if done in a thin layer of solution (e.g. in a petri dish) it could form coloured circular and spiral wave patterns.
I've seen this reaction in real life in one of the chemistry labs at my university. It was really fascinating to see.
Nice how you synchro the professor "fuzzzshhhh!!!!" with the precise moment the chemical oscillation kicks in!!! beautiful!
Dat thumbnail. ^__^
And this is how Irn-Bru is made.
Thank god, i thought this was another video shopped video, but luckily he saw it happen so i will trust it.
old experiment being re-do again
good job!
The Belousov--Zhabotinsky reaction is very interesting. This video, however, was pretty disappointing to me! The reaction looks extremely different when done in a shallow dish. Seriously, go do an image search for 'Belousov--Zhabotinsky' and you will see what I mean. Brady, if you could get them to do the reaction the way it usually looks (I've never seen it done in a big beaker like that before actually) I am sure everyone would appreciate it. The patterns and movement the reaction creates in shallow vessels are amazingly weird (and interesting to me because they very closely mimic the behavior of certain cellular automata systems).
i hope sam recovers. shes prolly my favorite person on this channel.
How about including the chemical equation for future reference?
"West Germany" -- that is an old beaker.
Great footage Brady.
And good night from Down Under....
I still didn't understand why the compounds don't just reach a steady state. What's different between the two flanks of the cycle so to speak?
Great joj on the videos. If you get the joke.
Do you need Chemistry repair? Call Perirep Vidiv.
The thumbnail for this video is epic.
I'm a chemistry student and for my scientific club's project I tried to do a BZ reaction. After 2 months of trials in a department specializing in oscillations I switched to crystallography :D Still find it very promising in explaining, for example, the chemical site of the beginning of life.
Lol before you brought up the tie... IT CAUGHT MY EYE SO BAD I love it! *thumbs up* :)
I must say this reaction is blazing
Difficult to understand what's happening without the reaction formulas (or at least limplified versions of them). :p
Very impressive. You mentioned the Mn having a reduced catalytic property after a few cycles. Is this because of "waste" build up on the active centres of the catalyst?
i saw a demonstration of oscillating reaction that cycled through many different colours (green,blue,purple,red,yellow etc...) the chemist that was doing the demo said there were as many as 30 different reactions taking place
I have observed that when we separate the solution while the reaction is going on, the two parts loose the synchronisation of the reaction. Why is that so ? It appears as if the rate of the reaction is differing even if the concentration of the reactants are the same in both parts. Try it out if you haven't.
Fascinating video.
It feels like ages between videos. I'm sure you guys are plenty busy, however, it would be awesome to see more, more often.
Would it be possible to have a reaction where the colour changes from colourless to one colour to a different colour than back to colourless and so on? Or is that just too complicated?
Wow this is awesome.
Fascinating!
Great video
What's the name of the patterns mentioned at 0:50? Shliering maybe?
That's so cool!
"Made in West Germany"
Old beaker is old.
love oscillating reactions.
Have you ever tried to do this in a small petridish? I never saw but heard that if you do that, spiral fronts of reactions will occur, where parts of the liquid are orange and parts are clear in very interesting, cyclic patterns.
Get well Sam. You have a most excellent voice.
Well, I got my mind blown for today.
Is it also possible to have hot and cold reaction just like color change?
Ohhh, I'm doing a similar reaction as a demonstration for kids at my local elementary school.
I would be interested to see how food colouring may alter reactions (if at all) for example in the Iodine clock experiment
how does that sturring machine work? with a turning magnet? I'm trying to undertand how that works
there is an even more interesting oscillating reaction that changes between three different colours: the oscillating iodine clock reaction.
"Periodic Videos has already made a video about the iodine clock reaction, but I thought it'd be more interesting to have this oscillating iodine clock: it changes between uncolored, orange and black. I do not remember the reacting substances, but i'll post them as soon as I find my list again
Would this work with a different halogen like chlorine or iodine?
OH GOD, the thumbnail.
Awesome
What's the gas being released?
Martyn rocks
Nice, very cool
ha, "But I was in the lab and I saw it happening, so it's okay"
Very scientific, great video
So is it fair to say that the oscillating reaction only lasts as long as there is chemical potential energy in the system?
Love his humor!!
"ofcourse when you see something on video you always think something maybe its cheating, but i was in the lab and i saw it happening, so its ok!" LOL!!
does anybody feel like the beaker at the beginning was awkwardly large? Like, it wasn't THAT big, but it was just a bit bigger than what i am normally used to, so it made his hand look tiny, as if it was being compared to an "average" beaker.
Why didn't you enable comments on your recent BradyStuff videos?
Rofl at the JOႱ thumbnail
Wait why was it spinning?
why does it stop?
I'm considering Nottingham University slightly based on wanting to meet the professor :D
Please do more videos about like killograms moles combustion brownian motion
"Which is long enough to keep going till you're bored" XD I'm sure the professor has seen quite a few reactions in his time. :)
What a cool reaction :-)
nice reaction
Let the fro GROOOW !
What's in the bubbles?
So are oscillating reactions important for living beings or not?
Your ancient alchemist predecessors would be proud
make a video how the magnet for mixing works...
What happens to those solutions when they have finished with the experiments?
Probably goes into the halogen or the heavy metal waste container.
I think he points out the elements on his tie so everyone knows he has a great taste in ties. I don't blame him though
Pure art @ 3:30
Except for the obvious visual "wow factor" - what are the possible useful applications of this?
I think that the professor should have pointed out that the reactions is not truly oscillating, what's oscillating are the concentrations of intermediates and one of them is colored.
The best analogy that was taught to me was the following:
there are carrots (reagents), those are eaten by rabbits (the colored intermediate), foxes (another intermediate) eat rabbits and die leaving corpses (products, uncolored).
The rabbit population is small at the beginning, so is the number of foxes. But then rabbits start eating carrots and the population grows (color appears). Foxes start eating rabbits depleting their population (color disappears) and eventually they die. Then another cycle begins; rabbit eats carrots, so on.
The point is: carrots (reagents) are always being turned into corpses (products), the reaction doesn't goes back an forth.
Please Brady, could you add some equations of reaction to the video? I would be more happy than I'm now. And now I'm extremely happy about your videos but i would be more. =)
Please consider my suggestion. Have a nice day!
theres another reaction like this that oscillates between deep purple and colourless, does anyone know what it is?
The iodine clock reaction possibly
The Briggs-Rauscher reaction perhaps?
YES :D, it's the Briggs-Rausche, the iodine clock one was cool, but not the one I was looking for, but thanks guys :)
Dat header
length 4:20
Why is an equilibrium not achieved?
It is. You might be seeing the same thing each time but the composition is constantly changing, always moving closer to equilibrium.
It is once the catalyst runs out.
Cool, love chemistry. O yah, first.
did this one in class
if you leave the sulphuric acid mix before you add anything else, does the pattern dilute
Would reaction stop oscillating if you stop that mixing process?
Probably not, it just goes much slower because normally You stir it so that more soluted reaction Partners meet more frequently
I wouldn't think so, it would just be slower.
Wow
wooooosh!
Why did she lose her voice?
Most important detail of the video: 3:41-3:45
If the Professor (Prof. Poliakoff) says that something actually happened, then it definitely happened!
"but I was in the lab so it's ok" nobody was cheating :)