Combustion of Acetylene

[@brianlittle717]

Thank you so much. This is an awesome explanation. I’ve never understood chemistry. It’s something my mind cannot understand. I am a Heat & air contractor and I’ve used an oxy/acetylene torch for over 20 years and somehow I stumbled across your video. I like filling up milk jugs with my torch and throwing them in a fire! I will get a good flame mixture on my torch and shut off the acetylene bottle to extinguish it without changing my mixture and then I turn the bottle back on and fill the milk jug displacing the air. And when I think it’s filled up I cap it and throw it on the fire! Book! My friend showed me how to remotely use an electronic match. And then I started filling up big trash bags and putting an extension cord with steel wool to short the connections and I connect it to 36 volts on my golf cart. Boom! I never understood how it works but I enjoyed your video.

[@camishere4584]

Just did this at school today, soot everywhere

[@MrEthanhines]

Wow that was so well presented I really feel like I understood everything that was taking place well done!

[@afandou1966]

Actually the yellow tape at one of the openings has to be removed sinve its open.

[@MLFranklin]

Great comment at 8:46. Modern-day explorers would use batteries, but the calcium carbide lamps are *lighter.* Calcium carbide has phenomenal energy density, even better than liquid hydrocarbons. Batteries, even the best lithium-ion batteries, not-so-much. That's one reason why it's harder to convert our car fleet to batteries.

[@aaronclair4489]

These days, carbide lamps are totally obsolete. A modern caving light is lighter, smaller, more durable, longer lasting and easier to use than carbide. Although carbide lamps have a lovely warm yellow light, and a lot of stored energy, they release most of their energy as heat. Carbide lamps easily beat lights using incandescent bulbs and alkaline batteries, but can't compete in any way with the combination of Li-ion and LED. Cavers all abandoned carbide in the past 20 years. LED lights don't go out when you walk by a waterfall. However, it is always fun to read an old caving book that assumes you are using carbide. "Need to cut a rope, and forgot your knife? Simply use your headlamp to cut the rope! You can also heat food on your light."

[@brianlittle717]

I do have a question. I always slightly turn on my oxygen before I light my torch. If I light it with just acetylene I get all this carbon soot and it will really make a mess in a house or a restaurant and it lingers everywhere and won’t go away. So what makes that happen? I think it’s because of incomplete combustion. It is getting secondary air from the atmosphere but probably isn’t hot enough to burn off all the fuel so you’re left with this soot that just hangs around. Am I right?

[@rachelmetze3075]

Hi Ms. Dombrink! This was my high school chemistry teacher!

[@EdwardTriesToScience]

I'm surprised the flask didn't explode, I'm assuming I shouldn't conduct this with a non-Pyrex cheap chinese filter flask because the quality may be bad and it could explode right?

[@jellybeans6533]

Just say no to Chinesium.

[@EdwardTriesToScience]

I mean like they do have decent chinesium comparable to pyrex and simax (bomex is one which is actually founded by kimble glass), I have actually just tried something similar with hydrogen in a cheap filter flask, the pressure doesnt build enough to shatter it

[@jellybeans6533]

@@EdwardTriesToScience The problem is that counterfeit, sub-par goods seem to find their way into many product shipments from China. Unless you personally accompany the flask from glass gob all the way to your lab, you do not know what you really have sitting on the shelf. Also, regarding H2 versus C2H2: C2H2 has a higher heat of combustion (on a molar basis) than H2, and more moles of gas (relative to the reactants) with C2H2 compared to H2, so don't feel complacent if it was "fine" with H2.

[@EdwardTriesToScience]

Yeah I know that, I've bought a glassware set from amazon before, and when it arrived, it had bubbles and seams in the ground glass joints, and the condensor snapped while I was setting up distillation impaling my wrist, I've learned from that and buy decent glassware now (still made in china because its cheap but like proper name brands like synthware), and yes, I do know that when hydrogen burns it has less energy which is probably why I will only do this with hydrogen and the flask half full of water

[@nazdg2576]

Isnt there carbon dioxide in air with oxygen and nitrogen?

[@Paul-kd3ui]

Use a tube to venturi effect air with the acetylene

[@ngoanhkha4015]

thanks so much for the lesson

[@FlinnScientific]

Always welcome

[@inginerul1987]

In east europe we used to play with calcium carbide when we were kids ❤️

[@Jerichau360]

Maybe there’s a natural prices for crude oil that doesn’t mean involve dead animals…

[@janibashamolla]

Awesome. Experiment madam.. Thanks a lot madam.....

[@farnampa3716]

Thanks a lot

[@JUSTARANDOMOPINION]

Hey

[@ValMartinIreland]

What is the complete sentence " A friend of mine who was a cave explorer ??????? ???????? ??????????? >>>???? what are those words?

[@Klauszord]

i know i am one year late, but I hope this gets to you lol. she says "spelunker", which is an explorer/studier of caves.

[@hobson3724]

i wish i can go back to school

[@محمدضياءمحمد-ب8ش]

why use a clean and dry distilling flask in preparation of acetylene?

[@joestutler6582]

During the blackboard discussion, the side outlet should be open in the right to truly represent the setup. Cheers!

[@vananh5473]

2:34

[@sanziohanzo]

FIRE BLANKET is all i can see.

[@davisx2002]

carburizing flame. right?

[@Linus-nq2op]

Calcium carbide is not gonna do anything on your hands, if its not either flour fine or your hands are dripping wet.

[@EdwardTriesToScience]

Yes if your hands are dry you can handle it fine *theoretically*. You could also handle sodium metal with your hands just fine but it'll still burn ya, theory is not reality

[@Linus-nq2op]

@@EdwardTriesToScience I didn't say theoretically. I have handled Calcium carbide multiple times and even with sweaty hands touching it doesn't do more than getting slightly warm.

[@crooger3594]

I don't know why such things have to be saperately visually presented on the board in college. Should be obvious why it did not explode second time....

[@joestutler6582]

But it's not obvious to everyone, hence another perspective on the situation. It didn't hurt you; it helped others; it's all good. 😁

[@crooger3594]

@@joestutler6582 true... It is just that i've studied chemistry and it was expected from us to already understand such reactions simple stuff. But i know that collages in america are much less complicated than in our country in EU.

[@rubenriniddpriet5598]

Hey!!! soy mas pesado q naviii

[@feridun8987]

Türkiyeden sa türkler ALLLLAHHHHHHHHHHHHH TÜRKÜM LAN BEN TÜRK

[@davisx2002]

cave explorer and spelunker? redundant

[@joestutler6582]

And some folks learned a new word, so no harm no foul. 😁