No video
Chromium Trioxide (FAIL) - Periodic Table of Videos
Рет қаралды 650,524
Күн бұрынThe Professor shows us a tremendous reaction - but forgets to switch off the department smoke alarm.
More chemistry at www.periodicvid...
Follow us on Facebook at / periodicvideos
And on Twitter at / periodicvideos
Periodic Videos films are by video journalist Brady Haran
Brady's other channels include:
/ sixtysymbols (Physics and astronomy)
/ numberphile (Numbers and maths)
/ deepskyvideos (Space stuff)
/ nottinghamscience (Science and behind the scenes)
/ foodskey (Food science)
/ backstagescience (Big science facilities)
/ favscientist (Favourite scientists)
/ bibledex (Academic look at the Bible)
/ wordsoftheworld (Modern language and culture)
@admiralpercy 9 жыл бұрын
That is the opposite of a fail. When the chem dept. sets off the smoke alarms, that's always a win.
@leocorn58 8 жыл бұрын
I prefer to think of them not as smoke alarms, but science alerts.
@Aquapod9 10 жыл бұрын
Is the smoke alarm off? Ye- BEEP BEEP BEEP No.
@michaelhessel8086 9 жыл бұрын
The comedic timing of the smoke alarm is spot on.
@johncitizen3361 11 жыл бұрын
I had a professor that this guy reminds me of and I ended up working in his lab for a few years. If he said something like 'nothing may happen because it's an old sample', you knew the roof of the lab was about to be blown off. Brilliant guy and a joy to work with.
@gigglysamentz2021 10 жыл бұрын
4:50 -Is the smoke alarm off ? 4:51 -Yeah. *Alarm* No. Could not stop laughing, how did you know Brady ?
@gskaloyan 10 жыл бұрын
LMAO Oh wow. I wish everyone could have a teacher as awesome as Martin.
@gewoonyer 10 жыл бұрын
This man is the best, he's very good at letting you understand exactly what's happening. 10/10
@cat637d 9 жыл бұрын
If only all teachers were like this Gentleman!
@TheAlps36 10 жыл бұрын
4:18 I'm like holy shit!!!! but the Professor "not bad".
@ytrewq6789 10 жыл бұрын
.......And so the safety officer leaves the burning beaker of Ethanol unintended lol
@Draconorst 8 жыл бұрын
I use these videos on a regular basis teaching Science at a high school level. Thankyou so much for your wonderful vids.
@TollfreenumberORG 10 жыл бұрын
We are saddened to see from one of PeriodicVideos that in real life their new building burnt down on September 12 2014. Our hearts go out to PV and kudos to the administration to confirm plans for rebuilding so quickly. Can't wait to see what the new building looks like.
@jamesboueri2559 9 жыл бұрын
there is a drinking game in these videos somewhere
@MultiPureEnergy 9 жыл бұрын
The smoke alarm went off because Brady mentioned it
@willawrence27 11 жыл бұрын
Nothing may happen because its an old sample. but lets have a look.... FOOOOOOSSSSSHHHHHH!!!!!!! ... not bad...
@picobyte 9 жыл бұрын
Not A fail,that alarm works fine.
@billpill4420 10 жыл бұрын
And as a former pyrotechnomaniac, bravo!
@poligon333 12 жыл бұрын
This guy is epic. If had teacher like him today I might be somewhere else. Love this videos , thank you.
@watsson 10 жыл бұрын
The Professor is just so lovely! :-)
@TheMegawhatever 10 жыл бұрын
Proper lab procedure is not to smell directly from the source like in 3:02, but to waft the air toward your face with your gloved hand.
@LinuxMFKR 11 жыл бұрын
This man is the human embodiment of chemistry, love this guy!
@Soultrip89 8 жыл бұрын
I greatly enjoy watching these videos. I get a good laugh at some of the situations that rise from these experiments, but I've learned so much just from watching these. Great channel all around.
@MrBranboom 11 жыл бұрын
I think you'd have a hard time not enjoying chemistry with this guy as your prof.
@khajiit92 12 жыл бұрын
@ArtfulDawdger saying chemist to mean pharmacist is used in informal everyday language, so you might say 'i'm going to the chemists' when you're going to but medicine, or you could say 'i'm going to the pharmacist's', both would be understood as pretty much the same thing (most people don't really see non pharmacist chemists everyday). but in universities and where you're likely to find ACTUAL chemists, chemist and pharmacist are used differently (the same as the US probably).
@SteffeL2 12 жыл бұрын
"Is the smoke alarm off?" "Yeah" *half a second later* "No.." :D
@Nikolaii2571 9 жыл бұрын
I was wondering if the professor's hair might catch on fire. I'm glad it didn't because it's no laughing matter. I like the way he does his presentations. When the professor was gringing CrO3 in a mortar with a pestle, I saw a color change occur from green to crimson (on the sides of the mortar). I saw another video where Potassium chlorate and Potassium ferricyanide were ground together and the color change went from red to green. Very interesting.
@MsSoda91 11 жыл бұрын
Omg I would love to have you as a professor, too bad IM almost done with my biochemistry major You so funny!
@dd08880bb 12 жыл бұрын
Haha, great. "Have you turned the smoke alarm off?" "Yes." - smoke alarm goes on. "No." xD Brilliant! :D
@JonatanGronoset 12 жыл бұрын
I love seeing the Professor doing experiments! There should be more of this. :3
@jellyfishattack 10 жыл бұрын
I love this video. Prof, you're the greatest!
@leokimvideo 12 жыл бұрын
nice reaction indeed
@Rich1994W 12 жыл бұрын
I now want to do chemistry at Nottingham just for him to teach me.
@DukeLaCrosse20 11 жыл бұрын
I would like the prof to discuss what the ramifications of breathing the smoke and other gases from this reaction.
@98JMA 12 жыл бұрын
His name is Brady, he makes all the videos associated with science and maths - including Numberphile, The Periodic Table of Videos and Sixty Symbols, from the Uni of Nottingham.
@consummateVssss 12 жыл бұрын
"smells quite nice" lol does he steal drinks from the chemistry cabinet?
@XOIIOXOIIO 11 жыл бұрын
"Is the smoke alarm off?" "Yes" Smoke alarm goes off "No." lol
@TheRostbart 10 жыл бұрын
it was quite a lovely alarm this rather unusual man set of with his spectacular experiment.
@johncitizen3361 11 жыл бұрын
I just remembered, one of his quirks was to keep his mobile phone in an old sock. It would be ringing and finally he would realize and pull out this really long sock and unravel it and dig out his phone. I asked him why he kept it in a sock and he acted like he was surprised everyone didn't keep their phones in a 'sock protector'.
@PakiNewsNetwork 12 жыл бұрын
Very informative. What a fine professor we have here. My chemistry teacher was a monster.
@HansVanIngelgom 12 жыл бұрын
@FHomeBrew True, but the gas in the bottle may be a mix of fuel and air. When at the correct proportions, this mixture may be combustible, making the bottle explode. This is a problem in itself if you're dealing with a glass bottle, but even with a plastic bottle this means that the fuel gets sprinkled around. All this can mean that the person holding the bottle will have a very bad day.
@havoc873 12 жыл бұрын
Every time I watch your videos, I regret that I did not made the choice to study Chemistry. It is a truly exciting subject.
@hv53kma 12 жыл бұрын
"nothing may happen because it's an old sample" and this guy's the safety officer - that gets a thumbs up from me!
@Rich1994W 12 жыл бұрын
I don't blame you. Possibly the coolest Professor ever!
@collezionista97 12 жыл бұрын
i call it an EPIC WIN, not a fail
@gulllars 12 жыл бұрын
@BlueShadesAll i noticed this too. A very non-intrusive 2 second splash-screen at the end. And it's a relevant ad too. If this means more periodic videos, or better (or more expensive?) content in them, i'm all for it. This gets a thumbs up for me, and i hope they keep using classy, clean and non-intrusive ads like this.
@DevilMaster 12 жыл бұрын
@consummateVssss LOL, that reminds me of an ex classmate of mine who drank the ethanol he distilled in the chemistry lab. Anyway, you don't want to drink acetaldehyde, because ethanol being metabolized into acetaldehyde is what causes hangovers.
@sitrilko 12 жыл бұрын
Haha. I would show this to children, to show them: "Kids, when you study and do your homework, one day you might do fun stuff like this."
@ShiroKage009 12 жыл бұрын
"Nothing may happen because this is an old sample" Fire explodes. "Not bad"
@dujl 11 жыл бұрын
>Pure alchohol >"Smells quite nice" Lol.
@Poizon2K8 12 жыл бұрын
@riveness In most places, it would have been carried out in a fume cupboard, however, since the prof. is the safety officer, he obviously deemed that there was sufficient ventilation in that lecture hall for this particular experiment. Otherwise, it probably would have been done outside.
@wupme 12 жыл бұрын
@bamboo4tameshigiri actually most what we call hangover is not caused by the ethanol, but by other types of alcohol that are present in most alcoholic beverages.
@taylorwsims 12 жыл бұрын
I like how he mentions that the CrO3 is carcinogenic then proceeds to blow it up outside of a fume hood with little bits splattering everywhere. Cool reaction!
@Draxis32 12 жыл бұрын
That Oxidation state of cromium is quite dangerous, where I did my technician studies in chemistry we did a research on affordable ways of turning Cr+6 back to Cr+3, and turns out some bacteria in cow/horse excrement can do that!, so if some determined area is contamined with Cr+6 and you wanna turn into an agricultural field, just go ahead and add manure! (Obs: Very High concentration of Cr+6 may be harsh even to the bacterias so that's why this is a biological affordable solution)
@ecoworrierUK 12 жыл бұрын
All teaching in the UK should be done in the style of and by people like The Prof!
@npokora 11 жыл бұрын
I just finished my second semester of organic chemistry where we used CrO3 as an oxidizing agent. It's really cool to get to see it in action... it's not quite as cool on paper!
@Mastertim2006 12 жыл бұрын
Brady has ALLOWED the PROFESSOR to do an experiment?!? BRADY!! ALLOW HIM MORE!!
@logtothebase2 12 жыл бұрын
@FHomeBrew Chromium trioxide and ethanol are water soluble, the Ethanol would certainly oxidise but in a rather more controled manner, it is the reaction that is the basis of the original breathalysers used to check for breath in drink driving, i think they use dichromate salt rather than CrO3 (still Cr 6+) though. The crystals go from orange to green, others feel free to correct me, from memory and not checked facts before posing.
@Latinotatsuki 12 жыл бұрын
omg i was in that lecture theatre on thursday and today i got my uni offer for chemistry
@meandmydog05 12 жыл бұрын
Love this channel. The professor is a treasure.
@MrCliffybiro 12 жыл бұрын
'And found himself on fire' Possibly one of the best ever sentences.
@Arariel3 10 жыл бұрын
Brilliant! I love this guy.
@Palaflax 12 жыл бұрын
This channel is why I continue to take chemistry classes as electives in University :P
@logtothebase2 12 жыл бұрын
I remember clearing out a store from a Nottingham works, for another Nottingham education establishment, on the basis there would be much that could be used in the teaching and research labs, In the end there was substantial amount of Chromium trioxide of various grades and provenance, that was of academic interest but of no academic use use, I am sure there still tripping over (metaphorically you understand) bottles of the stuff 20 years on
@trespire 12 жыл бұрын
Nice way to start of the new year, hope we'll get to see more of that snazzy tie !
@jackiedim7028 6 жыл бұрын
Cameraman:Is the smoke alarm off? Professor:Yeah *Smoke alarm goes off* Professor:No....
@Ixions 12 жыл бұрын
"Is the smoke alarm off?" "Yea...No" lol
@prospero021 12 жыл бұрын
Does this mean you'll be setting more stuff on fire and blowing things up this year? Awesome!!!
@OOZ662 12 жыл бұрын
@Poizon2K8 @riveness I've heard that Nottingham's chemistry lecture halls have large exhaust fans on the ceiling above the experiment benches for just such a purpose...which is probably such a delay in the alarm going off.
@jeebersjumpincryst 12 жыл бұрын
WOW! U now have a large chemical manufacturer as a sponsor!!! well done, and good for Aldrich getting on board! :)
@CawChem 11 жыл бұрын
May I ask why on earth you're putting a displayed formula in an equation for a reaction? 2CrO3 + C2H5OH => C2H4O + Cr2O3
@LowieBro 11 жыл бұрын
This man is the face of science.
@meishme 11 жыл бұрын
I love watching these especially because I'm a potter and working with these chemicals is kind of scary unless you know what you're doing. And Chrome makes a lovely green on pots~
@lloydteddy 12 жыл бұрын
When I used chromium trioxide in my labs we had to use in a fume hood because it was carcinogenic, inhalation of fine particles is a serious risk especially when you grind the solid using a pestle and mortar. Don't know about them but I don't fancy inhaling a carcinogenic compound.
@Guineh76 12 жыл бұрын
@wpaxton Agreed. Beautifully crystalline. In the video before he started dividing it finer with the mortar, it looked almost purple.
@A_Dopamine_Molecule 12 жыл бұрын
I'm gonna be late to chemistry class cause I'm watching these videos. Gotta love the irony here.
@riveness 12 жыл бұрын
For a carcinogen (in some countires, ethanol is also classed as such), I am disappointed that this was not carried out in a fumehood.
@ALLenROOK 11 жыл бұрын
The Prof is such a boss.
@riveness 12 жыл бұрын
@Noxid666 Not ture. As you heard there are several safety issues with the compound. Normal safety practice in the lab where I work would be to have that compound used in a fumehood using appropriate PPE and precautions. It is disappointing not because the people making the videos don't know the risks, but that the audience clearly don't know standard safety practices. What does a student think when we see something like this?
@theviolator23 12 жыл бұрын
@projectpat0392 Oh my apologies, I miss heard the professor. Thank you for the clarification.
@ChainsawVsGod 11 жыл бұрын
The professor was just about to tear shit up as he went through the doors before the camera cut off xD
@rosquetipa 11 жыл бұрын
Aren't you worried about the fumes...? Or about residue on your gloves getting on the cap and then getting back on your hands when you go to put the bottle away?
@Noxidsignorantia 12 жыл бұрын
@entoris476 not narrow minded but simplified. I have a masters in my area of chemistry so do not talk down to me. And from my understanding the effect i was referring to was the slow disintegration of DNA through cells being feed with oxygen causing life and also causing the cells to divide to the point where cancer can form from a blip in the DNA.
@TyPh11 12 жыл бұрын
Chromium is really only dangerous in the +6 oxidation state(chromate, dichromate, and CrO3). The rest of its compounds are relatively non-carcenogenic, at least not because of the chromium.
@ihaveballsofsteel 12 жыл бұрын
Chromium in trioxide has oxidation state +6, and goes to oxidation state +3 upon reaction. Why is it that when I use Potassium Manganate (VII) where the manganate has oxidation state 7+ in titrations, where it goes to manganate 2+ upon reaction with a reducing agent I don't get the same sort of exothermic reaction?
@projectpat0392 12 жыл бұрын
@theviolator23 It was ethanal. It sort of smells like apples.
@stoicfloor 12 жыл бұрын
How embarrassing it was that the fire alarm was set off. Anyway, nice video!
@koolwalla 11 жыл бұрын
I seriously love this guy.
@stofstik 11 жыл бұрын
Made my day
@Arthzil 12 жыл бұрын
Congrats on getting sponsoring :)
@pcorf 11 жыл бұрын
One of the best reactions ever!
@riveness 12 жыл бұрын
@pokemonmaster4ever63 That is hard to quantify. I am case it is unlikey and there probably would be particles of the Cr03 in the fumes. However due to its other hazards, normal practice would be to use this in a fumehood. But I am more worried on the audience perspective who will not be in the position to make educated hazards.
@bbsonjohn 12 жыл бұрын
smoke alarm -> trolling when nothing happens. Malfunction when there is a fire.
@DoctorVonGauntlet 11 жыл бұрын
The English captions for this video are absolutely hilarious...
@Detritus760 12 жыл бұрын
these videos kick butt... MOAR!
@Audi2431 12 жыл бұрын
Brady: is the smoke alarm off? Professor: Yes ..........no hahahaha love it
@njimko23 12 жыл бұрын
Why does the title say FAIL? Its should say EPIC.
@wupme 12 жыл бұрын
@bamboo4tameshigiri it is a known fact that methanol (which exists in most alcoholic beverages) is the cause for a lot of the side effects. Non distilled alcohol beverages like wine, which contain more of it, give you a far worse hangover. The same goes for everything that ripened in a wooden barrel. The purer the ethanol, the less your morning is gonna suck. You still got the problem with dehydration and missing other stuff. I don't need to wager on anything.
@garryentropy 12 жыл бұрын
how do they clean the mortar and pestle?
@DhruWithAnH 11 жыл бұрын
Perfect timing Brady!! Props to you!
Friendeez
Рет қаралды 14 МЛН
The Royal Institution
Рет қаралды 1,1 МЛН