Iodine Clock (slow motion) - Periodic Table of Videos

See the famous Iodine Clock reaction filmed with a high-speed camera. MORE SLOW MOTION VIDEOS HERE: bit.ly/chemslomo
Explained by Professor Martyn Poliakoff. Also featuring Dr Samantha Tang.
More chemistry at www.periodicvid...
Follow us on Facebook at / periodicvideos
And on Twitter at / periodicvideos
From the School of Chemistry at The University of Nottingham: www.nottingham....
Periodic Videos films are by video journalist Brady Haran: www.bradyharan....
Brady's other channels include:
/ sixtysymbols (Physics and astronomy)
/ numberphile (Numbers and maths)
/ backstagescience (Big science facilities)
/ philosophyfile (Philosophy stuff)
Watch videos about EVERY element: bit.ly/VT9nNZ
Reactions filmed with a Phantom Miro. We used this: www.visionresea...
Special thanks to Destin from Smarter Every Day for helping us out: / smartereveryday
Music courtesy of Alan Stewart - / alankey86

[@ruffus910]

Can we take a second to savor the image of the Professor putting on chemical magic shows for kids?

[@5Andysalive]

imagining this hair being squashed? No thanks!

[@jollyholly2851]

This guy looks like science.

[@seagullman8307]

He looks like Albert Einstein.

[@steelwarrior105]

Jolly Holly he is Albert Einstein and Nicola tesla combined in looks

[@icarusswitkes986]

I swear I see the same comment on every video

[@Dez.B]

Somebody already commented that

[@E9Project]

He's a wonderful person :)

[@kingofalldoughboys]

I absolutely love Sam's reaction to this experiment at around the five minute mark! I can't make out what she's saying but it's adorable nonetheless! 😊💜

[@SyntheticFuture]

kingofalldoughboys "oowh that's so cool" after watching the slow motion footage :)

[@mrmensa5480]

+kingofalldoughboys "oh my days, that's so cool"

[@Kizron_Kizronson]

That has to be near the top of my list of cutest things on KZbin. Which is impressive considering that KZbin is more so less built out of kitten videos.

[@murdocha]

I love the Lab assistant's reaction to the slow motion video and then Destin's reaction to HER reaction. Science, as always, is cool.

[@Eyerleth]

Alex Murdoch That's no lab assistant, that's Dr. Samantha Tang.

[@klausolekristiansen2960]

That is not a lab assistant, that is the public awareness scientist, Samantha Tang, PhD.

[@MissLexiMarie]

I've found my absolute favorite reactions of all time. The color change, and Sam's childlike wonder at the slow motion footage. I can't stop rewatching it!

[@mtdeezy]

Kind of interesting I think that you can tell how long the reaction takes from the high speed video by counting how many times the light flickers during the reaction. The AC cycle is 1/50 second, it flickers twice per cycle, so each flicker is 1/100 second. It flickers about 20 times during the reaction, so it takes about 1/5 of a second.

[@Meminjo]

Nerd

[@1312_PV]

​@@Meminjoare you mad because you're dumber?

[@logan_wolf]

@@Meminjo This would be the place to find them.

[@adamqazsedc]

4:53 Sam's reaction is absolutely adorable!

[@SapphireSiren]

This is absolutely beautiful. The swirls that the solution makes when changing color are amazing.

[@garyv2498]

I'm really enjoying the use of the high speed camera for these old school reactions. It really is a new perspective

[@darkshad109]

The hand held and heavy handed zoom & focus is Brady's style. I like it, keeps the eyes busy.

[@systempatcher]

Destin is on here???? Whaaaaaaaaaa

[@shadowprince4482]

As soon as I saw the reaction for the first time I wondered if Destin had slow-mo'd it. Then I watched this video and was stoked to see him in it.

[@renderedtoscale]

Dr. Tang's excitement on seeing the slow mo of the reaction reminded me of the intro to these vids when Destin was so excited to meet Professor Poliakoff that he was giggling hysterically.

[@tommo2785]

I was going to tag SmarterEveryDay in this video when I saw the high speed camera. Then, he is in the video

[@DontMockMySmock]

That is one of the most amazing pieces of high-speed film I've ever seen.

[@AahanaPriyadarsinee]

Science is always COOL!

[@terimccorquodale]

Awesome

[@U014B]

Only with endothermic reactions, though.

[@seagullman8307]

+Noel Goetowski what do mean?

[@U014B]

electricrainbow​ Endothermic reactions, as opposed to exothermic, absorb heat, thus making the product of the reaction cooler.

[@seagullman8307]

+Noel Goetowski ?

[@un2mensch]

This is probably the coolest periodicvideo ever!

[@Automatedresponsebot5]

Wow, one of my science teachers in middle school used to show us your videos all the time. This is like a trip in a time machine

[@Viro57]

Learning about Chemical equilibrium and phase changes in University, and then watching this video really demonstrates what chemistry is all about!

[@mo5h3rman]

Fluid dynamics right there. Taking that class right now.

[@cristianfcao]

4:52 That was one of the BEST "reactions" I've seen in this channel!! That girl REALLY loves chemistry!

[@nickcain14]

Brady i have to say this is possibly the best video you've produced!

[@DynamixWarePro]

I have seen that reaction many times, but great seeing it in slow motion, especially seeing her reaction to it at 4:52!

[@BGroothedde]

Oh man, I'm so glad I am subscribed to this channel... All the information I already got by watching these videos, and now they are showing reactions and explosions in slow motion... Amazing, so pretty!

[@oliverberry]

One of my favourite reactions! I am doing it this Friday with a class of 16 year olds... I can't wait for their reaction!

[@RabbitsInBlack]

That was and is the best experiment/reaction in slow mo there is and so much more interesting.

[@MephistoRolling]

her reaction to seeing the slow motion gave me a giant smile!

[@sizwembokazi8725]

The video is impressive! Thanks Prof and your team.

[@fireandeurovision]

My friends and i done a science presentation in July and this was one of the reactions

[@mariomario42]

I got to do this reaction in high school years ago! It was my favorite by far. Awesome to see it through high speed.

[@iCantMakeMovies]

This is amazing! I didn't think I could love your videos any more than I do but introducing slow motion to the reactions makes me so excited I don't know what to do with myself. Brady, you and Destin are a KZbin power duo.

[@theallseeingmaster]

All of these videos are just so interesting.

[@kathrayres]

We did a similar sort of reaction in my AP chemistry class- we were measuring vitamin C concentrations in different juices and used an iodide-iodine-iodate combination to remove the vitamin C from the juice, turning the solution black/blue. VERY cool effect, and even better in slow motion!

[@Che8t]

love how that chemical reaction causes a logo watermark to appear on the screen...

[@ZOMG_MUSIC]

Lol its so if anyone steals the footage they will be led back here

[@OnTheLooseGoose]

Proffessor- yesterday we were learning about the principles of green chemistry at school (I do A-level chem) and I was grinning from ear to ear the whole time thinking of you campaigning! :)

[@Mazth]

Dr Tang instantly gets +5 awesomeness for that reaction. Now that's chemistry

[@onionofdeath]

By far one of my favorite reactions in the series!

[@DazB85]

Reactions at his kids parties... man wish he was my dad! True Hero!

[@TheIndigoGecko]

The slowmo video is really cool... watching the BEST GEEKOUT EVER over it was the icing on the cake!

[@gordothemaecker]

I like how well you explain the reaction in this vid

[@johnopalko5223]

I love Sam's enthusiasm.

[@scuzzy5005]

Yes it is! Look up some other periodic element videos, there is one where he meets the professor!

[@Genet1xProductions]

Lovin the new shots ur getting with the high speed camera Brady! Excellent idea, and yet another great video thanks :D

[@rangedfighter]

how beatiful is this reaction !!! It's amazing and fascinating to watch it, really wonderful

[@Skip6235]

The reason the light flickers is because the lights were plugged into the main power grid, which transmits power in alternating current. This means that the power rapidly switches many times per second. Normally this is so fast that your eye doesn't notice the flickering of the lights, but use a high speed camera and you are actually seeing the power go off and on

[@SiTiX1]

thx for great videos, and i want to thank Destin and you guys for a good co-operation for showing us these great things.

[@12tman12]

As far as I understand it, that's what this reaction already does. It converts the I back and forth between two reactions using bisulfite. No entropy laws are broken because the "external" energy source that allows the reaction to go both ways (which they normally can't) is your bisulfite, which is consumed in the process.

[@Critter145]

Guys, these videos are stunning!!! Thank you U of Nottingham ! Thank you Destin!

[@cristianfcao]

Hey Brady! Here's a BASIC chemistry question that I'd love to see it addressed in a video. To what degree a chemist can predict (on paper) what would happen in chemical reactions? Are there specific properties of the atoms/molecules that, when combined with others, make the mix explode, gain volume, evaporate, dissolve one element, and so on?

[@glenwoofit]

Thats got to be the best reaction to a reaction ever!!!!!

[@Cornholioam]

I can't understand what Dr. Tang is saying but it's impossible not to feel her excitement.

[@alexvillanigale]

I love this reaction. I performed a version of this as a lab for PChem. I agree with the Professor that the concentrations of the various reagents would be different depending on how you added them together in the beaker. Perhaps to test this hypothesis you might try mixing the solution with a stir bar while adding in the reagents and continue stirring the solution after the reagents have been added. With proper mixing, the whole solution should be able to turn blue all at once.

[@therealjordiano]

really loving these high speed camera videos xD keep it up guys

[@srobart]

It's actually a really beautiful reaction in slow motion.

[@harryjebb7235]

this man is single handedly curing my depression

[@AMTunLimited]

She nerds out, and it's adorable. I love to see that kind of excitment in science.

[@ragnkja]

Nice for you that you enjoy getting the first comment on a video. I, on the other hand, prefer to enjoy the actual content of the video before commenting.

[@666Tomato666]

Love to see her this excited about chemistry!

[@lennutrajektoor]

It's been a while since high-school but I can't recall that I remember the stripes in the liquid before it changes the color. In the first reaction on normal speed you clearly see the stripes. I guess it's due to camera recording it. The slo-mo clearly shows the reaction is exponential.

[@superdau]

I watched and replayed the reaction part of the video several times. I never even saw there was a watermark until I read the comments.

[@lennutrajektoor]

Would be super if the processes could be filmed in slo-mo w/ macro lens for intimate close-up. I understand that the videos are already filmed but for future videos think about this, Brady. Thnx!

[@Kaihlik]

Gav from the Slowmoguys lives in the US and works at Roosterteeth (check out their Achievement Hunter vids and the RT podcast to see Gav). Dan still lives in the UK and they filmed a bunch of videos before Gav went to the US and then some more when Gav came back to the UK for a visit. They are planning on filming some in the US relatively soon when Dan goes for a visit. Also awsome vid Brady.

[@spicyweasel]

Is that Destin at 4:53?

[@bossman9124]

Yes, he's on the show to provide them with a high speed camera

[@ihrbekommtmeinenrichtigennamen]

It is very nice to see different, well known people from youtube collaborate.

[@frank083]

LOVE having the chemical reaction formulas! !!!!!!! Please keep them! !

[@psychot1cally]

These videos are soo incredible. I love them!! Seriously great work.

[@MoltenToastWizard]

i did an experiment on Iodine Clocks for my A2 coursework (reaction kinetics). its both relaxing yet tense, you are looking at a beaker for minutes on end, but if you look away for one second and it finishes the reaction, then you have to repeat the experiment :P

[@chrisvighagen]

Samantha Tangs reaction is priceless, a true geekout if ever there was one =D

[@randomanimeinu]

At about 4:45-ish, I blinked and actually missed the whole chemical reaction. I love this.

[@ebarshin]

i love these videos but sometimes i feel totally lost. i wish i remembered more of my chemistry classes in high school 25 years ago...

[@sleepy962007]

I love the professors energetic hand gestures :D

[@zasgat]

i like it when the professor has a lesson at the end

[@alsifjlasieflooo]

Love the slowmotion chemistry!

[@llgla]

Watching these makes me feel Smarter every day ;-)

[@N05CF02]

best chemistry lesson ever!

[@shananagans5]

Very cool. I love the high speed cameras. I had not really considered how interesting or helpful it could be watching chemical reactions in slow motion until I saw your channel. Now I need to figure out how a high speed camera could help with my psych patients. Hmmm. I can't think of a practical need but the looks on peoples faces at times sure could be amusing.

[@LynxHope]

Whatever camera you use, when doing high speed shots it's best to light what you're filming well because of how little time the shutter is open for each frame. I have used a Phantom Flex a few times, when we do; we use massive reflectors and high power lights.

[@chris210460]

I like these slo mo movies. Would be nice having a stop watch in the background to show the time elapsed...

[@OhhSnapAndCrackle]

Iodate? Iodine? Iodide? .. Io-don't know what's going on anymore but this is awesome.

[@Mekratrig]

Destin and his superslowmo cameras!

[@jeffreysdavis]

Briggs-Rauscher is an extension of this so that it oscillates from colorless to dark blue to light yellow and repeats continually. I love chemical oscillators

[@LinkolnG333]

Absolutely amazing.

[@vanessaaitkensilva4279]

In one word : AMAZING!!

[@Quintinohthree]

I actually did this reaction yesterday, but with mercuric chloride added to give an orange solution with iodide before it turning black. It's known as the Old Nassau reaction.

[@Karikato]

To coop with Destin was really an absolutely genius idea!

[@KevoGoon]

Anyone else watching this in 2024???

[@Natobot9000]

I just noticed Destin from smarter everyday!!

[@ShaunieDale]

Yep!

[@bramptongora2008]

Who cares when people are watching this

[@finsyabela]

Yes. Me.

[@KevoGoon]

@bramptongora2008 dam dawg, I can't even comment what I was thinking at that moment?? People like you I swear, piece of stool. 😂

[@6u6u7o]

YES! I wanted to see it in reverse! Thank you, whoever edited the video! :3

[@FreethinkingSecularist]

This is so beautiful! Thank you.

[@Arazand]

I think is at about 1000 FPS. Check the first slow motion video, they actually talk a bit about the company that makes these cameras so you can link yourself to the exact same product.

[@TyronTention]

It never gets old.

[@afhdfh]

Awesome how excited the woman is when she sees the slow-motion!!! :)

[@Anonymous5125]

Nice timing of the professor's snap at 4:42.

[@Mr27ace27]

We did the Iodine clock reaction in lab yesterday!

[@JimHendrickson]

This is great. I'm looking forward to seeing more high-speed reactions.

[@josephfox9221]

I love how she just burst with excitement just watching them chemicals change colors

[@TheZarownyDude]

I love that there is standing a book behind him which appears to be a "how to grow a affro book"?

[@murdocha]

I love the look on Destin's face at 4:56!

[@oOfretlessOo]

There is a visible pulsation of light which, I suppose is at 50Hz -> distance between two pulse peaks is 0.02 seconds. *I counted 22 pulses* -> [reaction time]=22*0.02=0.44(seconds).

[@qoaa]

Cool to see Destin from Smarter Every Day cameo toward the end!

[@ltericdavis2237]

Entropy makes beautiful patterns

[@KarlFFF]

Stunned by the beauty! so subtle and beautiful!