Burning magnesium in dry ice

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Declan Fleming shows you how to prepare and demonstrate burning magnesium in solid carbon dioxide (dry ice). This dramatic and beautiful demonstration shows that oxygen isn't always a prerequisite for fire and reveals carbon's place in the reactivity series.
Read the article that accompanies this video at bit.ly/EiC_ec0511
This is part of the Education in Chemistry Exhibition Chemistry series: chemistry demonstrations to capture your students' imaginations: rsc.li/EiCExChem
Browse hundreds more chemistry education videos, experiment handouts, interactives and games at www.rsc.org/learn-chemistry.

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2 окт 2024

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Комментарии : 647

@CharlesGriswold 10 лет назад

Dry ice is carbon dioxide. Carbon dioxide, by definition, contains oxygen. The magnesium isn't burning in the absence of oxygen; it's stealing the oxygen from the dry ice.

@OnerousEthic 6 лет назад

Isn't it customary for science videos to explain the science lesson, rather than commentators?

@Hazzardworks 11 лет назад

and thus, the Tesseract is created...

@flyingtanks9313 9 лет назад

YAY THE SOUNDS WERE COVERED WITH SAFETY TIPS!!

@CrazyGamer1541 10 лет назад

Now that, That makes for a cool candle

@QW5ub255bW91cw 10 лет назад

'cool' hehe.. dry ice.

@CrazyGamer1541 10 лет назад

***** Ehh? Right Right?

@benwillo3347 10 лет назад

he just had a nerdgasam

@hanelias 10 лет назад

***** Omg what a "dry" joke.

@QW5ub255bW91cw 10 лет назад

im a chick

@jonopedersen6282 10 лет назад

"Don't rush it to quickly, or else you may risk breaking the block" he says as he then saws through it faster than I ever would! LOL

@TheBoss-ey1li 9 лет назад

LOL i was shocked myself

@jonopedersen6282 9 лет назад

xDD

@bgandbm 9 лет назад

so cool

@bgandbm 9 лет назад

sssssoooo ccccoooooooollll

@GhostlordGames 9 лет назад

+Jono Pedersen Literally the same thing I was thinking...

@BlakeSiefken 6 лет назад

Lost in Space anyone?

@randomraft3562 6 лет назад

THANK YOU! xD Thought I'm the only one.

@naralove121080 6 лет назад

Omg that robot is bad ass

@idkman2805 6 лет назад

yeees lol

@floraherrera4541 6 лет назад

YUP

@BassByTheBay 6 лет назад

Just paused the show to check this out. 😊

@Nighthawke70 11 лет назад

This clip is the example of the breakdown of CO2 by a thermal reaction, cracking the CO2 down into base elements; C and O2. Then the magnesium devours the oxygen in the thermal reaction until the fuel is expended. The carbon remains as the end product of the reaction. This is why you do NOT use CO2 extinguishers on metal fires. Class D (smothering) agents are used, salt or copper based agents as examples.

@Hargak 12 лет назад

flat edged blade will make the noise due to the reaction of the dry ice during rapid evaporation, with toothed blades the contact surface area is not flat and won't make it vibrate.

@Broockle 8 лет назад

I was actually hoping the dry ice would start burning. I heard that hot Magnesium will form Magnesium oxide by stealing Oxygen from the CO2 bond. So the CO2 would be ignitable in that way. Does that not happen at all?

@Broockle 8 лет назад

***** nice thx it's underwhelming when you watch it but when you get what's happening it's pretty cool.

@RyuuzakiXIII 11 лет назад

In french dry ice is also called "carbonic snow", I think that's a pretty nice name. :)

@bills1583 11 лет назад

At the end it shows the black residue that remains. This is carbon from the carbon dioxide. What this is demonstrating is that the magnesium reaction can burn the carbon dioxide by extracting the oxygen from it leaving only carbon behind.

@WireMiceOverKingWhea 12 лет назад

For those that didn't get the memo, there's no water because this is dry ice (frozen CO2) and there is no melted CO2 because it doesn't melt unless compressed - it sublimes (goes straight from solid to gas).

@DGStevox3 11 лет назад

As far as i know magnesium can, if its in fire, produce its own oxygen for the making this fire. Its like a flare: If u light it once it will burn down completeley, even in a vacuum

@greatorder 11 лет назад

Also, the blood and water flow in opposite directions, allowing maximum oxygenation of the fish's blood.

@Necrophite78 11 лет назад

Looks like a nice reading lamp

@marcomili 11 лет назад

@erielhonan. You have two interesting points. This experiment shows that CO2 can oxidize Mg producing MgO and elemental C. This reaction produces a high amount of heat and you can see it in the form of "fire". When you burn something you are oxidizing it, and the oxidant is O2 in the air. In this exp. the oxidant is CO2 (they meant O2 is not involved). Extrictly speaking youre right about having a more extrict isolated enviroment, BUT take into account this: (Continues..)

@TulanePass 6 лет назад

Lost In SPACE

@idkman2805 6 лет назад

yeeees xd

@1ukjunglednbraver 12 лет назад

@josephaarongermany its the same thing the magnesium strips the oxygen from carbon dioxide to burn it does the same with water its strips oxygen from h20 aka water as the magnesium has a higher affinity for oxygen than hydrogen does its the same reaction more or less..its also a reaction related to termites

@Hannodb1961 10 лет назад

Cool. This is the first time I see fire that does not involve oxygen. ....oh, wait!

@tcalomfirescu 11 лет назад

My favorite part was the legal and safety commentary--That's what I came for!

@Seguris 12 лет назад

Only using a flat edge knife makes the 'fart' sound when you cut dry ice. He used a saw, so it had teeth/was serrated (which is why it didn't make the sound).

@deaftodd 12 лет назад

Two things I may conclude, there's a gap that it's sucking in oxygen OR its so hot that it splits the CO2 into oxygen and carbon

@Hargak 12 лет назад

in other words, the c02 pressure coming off of the dry ice vibrates the metal.

@argo2720 11 лет назад

its so beautiful

@notaras1985 11 лет назад

wow since little i wanted to become a scientist to play with these stuff all day..

@Guitcad1 10 лет назад

How about doing the damn safety disclaimer first so you can explain wtf is going on here? Yeah, I read the description but it would have been nice to have that explained while it was actually happening.

@TimpBizkit 8 лет назад

Well the magnesium would snatch the oxygen from the CO2, similar to the way the thermite reaction snatches oxygen from iron oxide to give to aluminium.

@tomturbuckle0076 11 лет назад

It burns in co2 gas. That's why the products are carbon and magnesium oxide.

@u4eagun 12 лет назад

ummm hes not really cutting it, he used a saw to rip it apart. Its like cutting paper with scissors and then riping the paper apart with your hand, they both make two different sounds..... well thats my educated guess but I might be wrong.

@LakeBodomsReaper 11 лет назад

I'm guessing just the dry ice being remotely around the flame would cause it to evaporate insanely quick, making it impossible for a decent cavity.

@HodorGamingTV 9 лет назад

That was cool as hell, thank you for sharing :)

@xavierbarry2970 9 лет назад

'Cool'

@SillyMooon 12 лет назад

coolest candle ever.

@dbeierl 11 лет назад

WHY? What would you rather he'd used to light the stuff? Flint and steel? Pretty clear that you've never tried to set pellets of magnesium on fire, you can't just hold a match to it. Did you not notice how long it took to light even with the torch? I admit that for dramatic effect he could have used a piece of magnesium ribbon run out through the side, lit that with the torch or even a lighter and let it burn in and light the mass of magnesium

@EricNoob50 11 лет назад

Can you please evaluate further on this experiment? Can you show us a full equation of this reaction?

@stevter13 12 лет назад

you could use a drill and a heated wire cutter

@freckles9298 11 лет назад

No matter how advanced we become in technology, you can't deny that it's always going to be fun to poke things with a stick. 2:40

@Mxsmanic 12 лет назад

The video explains how to do the demonstration but does not explain what is being demonstrated.

@marcomili 11 лет назад

(continuation..) as solid CO2 sublimes, it becomes gas and as it is very cold its density is higher than the room temperature gases, so as gas CO2 buids up, it pushes the other less dense gases out of the system (including O2), getting finally a system with no oxygen (at least for practical purposes)

@kowalityjesus 12 лет назад

absolutely fascinating thank you....i suppose thats how flares work and i always wondered that! :)

@drflash36 12 лет назад

IF you understand chemistry, the following reaction scheme summarizes what occurred in THIS video: 2 Mg + CO2 -> 2MgO + C solid + heat + light. 'nuff said!

@1977TheHammer 12 лет назад

Correct. I belive he misspoke. The idea here is that the molten magnesium will react with the OXYGEN atoms in CO2... leaving carbon soot behind. The magnesium is actually taking the place of the carbon if you want to look at it that way. P.S. the heat generated from the magnesium will sublimated some CO2 from the inside walls of the block, providing more oxidizing CO2 for the reaction. CO2 may be good for suffocating most fires we see in daily life... but not for metals like these.

@stefanvallin5288 11 лет назад

Actually there is almost as much oxygen in the air you exhale as the air you just inhaled.. the difference being a mere 4-6%, which is why CPR is possible to revive someone.

@archon808 12 лет назад

I dont get it. the magnesium would have burned anyways right? You dont need a frozen co2 container to burn magnesium.

@joeladhika 9 лет назад

And thats how tesseract are born

@princesswonderwoman6209 8 лет назад

+Joel Forrel Aha! suspense revealed!

@chanceholbrook5945 11 лет назад

it reduces it??

@bobwashere66 11 лет назад

This may sound stupid but is magnesium self oxidizing?

@Luminaring 10 лет назад

Just trying to thank Firebirdharris7 and Bill S for explaining what we are seeing here. Magnesium needs oxygen to burn. The dry ice (solid CO2/carbon dioxide) means that the environment the magnesium is in doesn't have diatomic oxygen (O2 which is what we breath and is just normal air oxygen) available to burn. What you are seeing is the magnesium taking the oxygen from the CO2 because magnesium is more reactive than carbon. Bill S. observed, black residue is carbon left after oxygen is consumed by Mg O2 reaction.

@Dontworryboutit247 11 лет назад

fires involving reactive metals such as magnesium are difficult to extinguish. why is pouring sand on the fire better than attempting to use carbon dioxide fire extinguisher. Can anyone explain to me???????????? PlzZZZZZ

@rincewind93 12 лет назад

was the burn in real time? or did you speed it up? also will more magnesium lead to a longer burn or a hotter one?

@JakeEricson 12 лет назад

Why? It's sort of necessary to burn magnesium. I found this to be amazing the blue-white light shining through the dry ice was sick. Not only that, before this I never even considered the fact that an element/compound could burn in an environment where the only oxygen is bound to another element.

@1977TheHammer 12 лет назад

Yeah, dry ice has that mottled look too it. That's normal. its very important to remember that the only thing that stops this reaction is reacting all the magnesium. The CO2, normally thought of as very cold, is actually fueling this reaction. Don't add too much magnesium or you could spill out the sides waiting for it to die. :)

@ohmahgawdfilms 12 лет назад

if dry ice shouldn't be contained in a sealed container then walmart is really screwed cause they keep a ton of dry ice in a small little freezer in the front of the store.

@secutorclaudius 12 лет назад

@rudedog9d yes, i learned this in the navy. nothing can put out a magnesium fire, u just jettison it, throw it overboard.

@josephaarongermany 12 лет назад

@goamarty really? then why does magnesium burn under water? or in an environment absent of oxygen or co2???

@DJWolves97 12 лет назад

Yeah well guess what i only get a really really uncomfortable feeling when I touch or think about cardboard, wood, paper for some reason and it only happens every so often

@ryanyuen931 12 лет назад

How did I get here?!?!?! i was watching frog dissection!

@GenScinmore 11 лет назад

next up: thermite in dry ice.

@tombanner01 9 лет назад

Best night light ever

@fdota 11 лет назад

i think matthew's comment was a sarcastic response to erielhonan's astute observation that CO2 contains oxygen, and his fallacious assumption that the oxygen atoms in CO2 can be combusted as if it were in the O2 form. He is remarking that by using erialhonan's fallacious logic, human's should be able to breathe CO2, and that fish must somehow electrolyse the water to obtain the oxygen. Although his wording was unclear as to the intent of his post, I must award Mr Kim a solid 7.5/10 for sarcasm.

@LONEstudios 12 лет назад

But will it blend?

@doph33 11 лет назад

Particularly interesting as CO2 is used in fire extinguishers, and inside the cavity it would be full of CO2 vapour.

@TailsX97 12 лет назад

@nliausacmmv maybe because the block is as large as it is, it kind of cools itself.

@VRTMovies 12 лет назад

not sure if hot or cold...

@alchemicalcheeseiv9244 11 лет назад

Awesome!!!!!

@CrAzYcArNiE08 12 лет назад

cause he is not forcing something into it, the gas can escape freely.

@Sean_735 12 лет назад

Actually, the magnesium just takes the CO2's oxygen, making carbon and magnesium oxide.

@1ukjunglednbraver 12 лет назад

@josephaarongermany sorry my English is very poor and im english yet dyslexic... science is one of the few things i excel in. my explanation is not perfect but the jist of it is about right

@Williams29MinuteGuarantee 11 лет назад

This was a cool video

@Brandonb8621 12 лет назад

What does this have to do with kevin bacon?

@TheSteelcry 9 лет назад

This guy taught me chemistry! LOLHe is really awkward irl :P

@petri2946 6 лет назад

StGIS? Same.

@8VibeStudios 12 лет назад

This is my new lamp.

@supertornadogun1690 6 лет назад

Crazy thing is this is a type of thermite reaction

@frankytap 12 лет назад

did anyone else shiver by the sound at 0:40 ?

@Lilmiket1000 11 лет назад

haha I was thinkin the same thing. I was like did that just break half way thru??? but i wrote it off haha.

@euhura 12 лет назад

He did not say "hitted it" he said "hit at it". "Hit at it" is 3 words.

@themadms 12 лет назад

aaaaaand i'm on a random video streak... again

@Slackrates 10 лет назад

"You want to see the Ark opened as much as I do..."

@urgoth4 12 лет назад

He said hit at it.

@adamchalupa635 11 лет назад

Anyone know where you can buy magnesium?

@jossalv1 11 лет назад

When this experiment sets off the smoke alarm.Does that mean the whole school gets the rest of the day off?In that case....experiment away sir!

@shwinnffxi 12 лет назад

"Hitted it with the chisel"

@zaqzaa 11 лет назад

maybe !

@nai1po1ish 12 лет назад

hahahahahahha omg i'm rolling! i deadazz rewinded that part like 5 times to hear what he said

@jamesfreud1 8 лет назад

I don't know why but hearing that saw cut thru that ice makes me cringe! I get chills running up and down my spine. I don't like it!

@samdilks29 11 лет назад

You put the lid on the wrong way, you do not understand how annoying that is.

@MuzikBike 8 лет назад

Now what would happen if you lit magnesium ribbon under sand? Since silicon is an analogue of carbon I'd assume something fairly similar would happen

@IncrediblyLameName 12 лет назад

"hit at it"

@strongangel 11 лет назад

What is the actual purpose of this?

@carpediemarts705 5 лет назад

So the point of this was... There's more cold in a block of dry ice than heat in a spoonful of burning magnesium?

@SuperCannabisFarmer 12 лет назад

I don't understand why the ice dose not melt.....???.. Elaborate Please ..

@xxApplesauce 12 лет назад

He said "hit at it".

@76327monte 12 лет назад

I'm on the British side of RU-vid again.

@xxghx0xstxx 12 лет назад

I don't get it.

@SavageHenry777 12 лет назад

he said hit at it, not hitted it. you can tell from the context that he wouldn't use the past tense.

@malectric 10 лет назад

I'm impressed by the burn time considering the small amount of Mg present.

@xSKULLGRINDERx 12 лет назад

Usually when you burn Mg you get MgO, but in this case I think that the O was replaced by the C because in the end the product was black instead of white which Mg is after you burn it (becoming MgO).

@wilsmanpeterexcess 7 лет назад

WRONG AGAIN. It's the oxygen being rippid away to firm magnesium oxide, leaving the carbon behind as a dark soot on it.

@MrOkazak1 11 лет назад

Not as bright. If you see this in person, you will see that this dry ice MG rxn is much brighter.

@650yoghurt 12 лет назад

what about termite?

@ChumpusRex 12 лет назад

@SlimySnail44 Magnesium is more reactive than carbon, so is able to displace the carbon in the carbon dioxide, and react with the oxygen. This reaction occurs because of magnesium's unusually high reactivity. Most substances are not reactive enough to displace carbon, so cannot react with carbon dioxide. This is why CO2 makes a good fire extinguisher. However, as this demonstration shows, CO2 cannot extinguish reactive metal fires (such as sodium or magnesium). Other extnguishers are needed.