The longest 7 min video i have ever seen

@johnsamosa3927

4 жыл бұрын

lol yeah

@lucasvan8707

4 жыл бұрын

True. But it was still useful tho

@sullyvan151

4 жыл бұрын

@@johnsamosa3927 thx for the reply

@sullyvan151

4 жыл бұрын

@@lucasvan8707 i agree

@johnsamosa3927

4 жыл бұрын

@@sullyvan151 youre welcome

POV: Mrs Barnfield has forced you to watch this video and summarise what it is about

@isabelle4680

3 жыл бұрын

😂😂😂😂

@whistle168

3 жыл бұрын

At least you got it right this time

@shampoofairy6592

3 жыл бұрын

Nah it’s a mrs bunting lmao

@joe9392

3 жыл бұрын

Can u send me ur write up boss

@biggestcurrymuncher55

3 жыл бұрын

It’s not her, it was Mr Peanut

POV: The legend Mrs Barnfield wants uses KZread videos to demonstrate cus she's hip with the kids.

thanks mr hoyland. totally needed this today.

They allow for seperate pathways through which you go from the same reactants to products with less activation energy. Solid catalysts like platinum and palladium hold the molecules of the reactants down so they can react more easily, and they then push off the products, something very important for good catalysts. Cataysts need not be solid as long as they make for a mechanism in which they're not used up. Fast colliding particles in the appropriate spatial orientation lead to reactions.

@ep5659

7 ай бұрын

Pumice isn't solid?

Honestly just here because I nearly fell asleep watching this in my science lesson because it was so relaxing 💀

thank you for savinng my chemistry GCSE

Bare complicated words...

@Langshot

2 жыл бұрын

yo my kitty kat g

Why is porous pot catalyst used normally in this reaction? How exactly does it reduce the activation energy?

Why is the catalyst heated strongly before the oil is warmed ? would evaporate too quickly ?

I loved it, your science is very amazing!

Extremely useful! Thank you

love the video.What a watch!!!Extremely exciting.thanks kiddos

Link at the end of the video is unavaliable!

Agree strongly with Stephen - a Bunsen valve is easy to make and adds safety. About 3cm of rubber tubing that fits over the end of the delivery tube. Make a longitudinal slit in the tubing with a scalpel, about 1cm long and then plug the end of the rubber tubing with a short length of glass rod. NB if using bits of broken stirring rods, be very careful as they will have sharp edges that are best removed by polishing the broken surfaces in a hot Bunsen flame.

@warmonger12z

Жыл бұрын

I was wondering why there wasn't an anti-suckback assembly on the delivery tube

@EddieTheH

Жыл бұрын

I was thinking the same, basically like a brake bleeder.

what is the catalyst used in industries in cracking? what did she say?

How the paraffin absorbed by the mineral cotton wool undergoes cracking to form these different organic compounds.

POV: u wanna watch attack on Titan but a certain teacher makes u watch this instead 🤬😔

@izziee9526

3 жыл бұрын

Same

@pikazu2578

3 жыл бұрын

😂

@whistle168

3 жыл бұрын

*Titan

@reisates5047

3 жыл бұрын

same ;/

@biggestcurrymuncher55

3 жыл бұрын

im more a full metal alchemist fan ngl

her voice is so professional and Discovery channel like

does this mean that the silica gel powder from chromatography or a silica gel from shoe boxes can be used as catalyst?

Thank you for posting this video!

Thanks! It help a lot

Very relevant experiment to enhance the knowledge on hydrocarbons

Thats very interesting. Mam can you kindly give us the procedure of isolating N decane from paraffin

Awesome video. A very important petrochemical refinery cracking reaction in a test tube. Can anybody tell me what is difference between cracking and reforming? , as i often see the same type of catalyst and temp. are used in both cases and also product is sometimes similar.

Hi, I intend to use ZSM-5 as catalyst for cracking Straight-run heavy naphtha (80-180 deg-C) to improve RONC. Please advice me this idea is good or not? What reactions will happen? What products will we receive? Best regards, Thanks!

@sisyphus645

3 жыл бұрын

I think you got your answer by now

@alaziziomar_

2 жыл бұрын

@@sisyphus645 lmao

just so you know miss Kennedy, no one listened to this :)

For this experiment my chem class used Aluminium Oxide as a catalyst. I do understand that the catalyst decreases the amount of energy required to break the Carbon-Carbon bonds. however, how does it do so? Thanks

@josh2232

4 жыл бұрын

pranavguitarist the catalyst lowers the activation energy, requiring a low amount of energy (heat) to break bonds between the carbons then break into smaller chains/ lengths of carbon thus producing derivatives of larger hydrocarbons

U r magician !

I'm confused about the last conclusion made about the last tube: Is it alkane or alkene you meant? ALKANE with a carbon-carbon double bond is contradictory...

@vmelkon

7 жыл бұрын

The text at 6:26 says alkene.

@gabriellaashong

7 жыл бұрын

Ian Yang An alkane has only one carbon to carbon covalent bond where as an alkene will have 2 carbon to carbon covalent bond and therefore it is unsaturated as the carbon atoms aren't bonded to the maximum amount of atoms. this make it reactive and so able to decolourise bromine water.

@Divalish.

6 жыл бұрын

gabriella ashong thank you!! 💪❤

Wow very knowledgeable

excellent video.. i wish you can ellaborate more on the function of the catalyst.. some good comments below though.

What is the reason the alkanes are collected first before the alkenes? Thanks

@manoel2519

4 жыл бұрын

@K dogg Yes

@aryanisverycool

2 жыл бұрын

That's because alkanes are single bonds and therefore are formed easier and come out first. Hopefully you see this even if I'm 4 years late

I understand how catalysts of this sort act, but I don't understand how this works as the catalysts sits to the bottom so the parafin doesn't necesarily goes through the stones

thanks for sharing, good video, I have a couple of doubts, how hot should it be...? Why can't the catalyst and the paraffin be put together...? What happens if I put them together...? using alumina as a catalyst has the same effect...? Thank you for your help...

@bueeenterprises3769

Жыл бұрын

this was posted 12 years ago, but id be happy to help with your questions

@leifercontreras4949

Жыл бұрын

Please and thank you, of course, I saw that the video is from a long time ago but it caught my attention, if you can help me with what temperature the catalyst must reach and why it must be separated from the paraffin, that would be great...

@Mass-jab-death-2025

7 ай бұрын

The catalyst provides a large surface area for the cracking reaction to occur. Saturating the catalyst (wetting it with the feed stock) lowers the temperature due to the (endothermic action of evaporation) and stops the reaction. The surface area of the catalyst has to remain at a high enough temperature and this can only occur when the feed stock in contact with the catalyst is a vapour. @@leifercontreras4949

may I beg your pardon! what is the name of that catalyst, the one that looks like chips?

@ataphelicopter5734

4 жыл бұрын

Pumice stone

thank you

omg dr wong, im ur biggest fan

Stop seducing me with your knowledge of organic chemistry

@Tore_Lund

4 жыл бұрын

"Avoid suckback" needs to be on a T-shirt!

i love cracking! (paraffin)

@bobbenny5180

3 жыл бұрын

More of a meth person myself

GREAT VIDEO

very nice

why do we use mineral wool, both instead of normal wool or no wool?

@hpkperera1172

5 жыл бұрын

If cotton wool is used it may catch fire

@bilbo_gamers6417

3 жыл бұрын

cotton wool could combust partially and contaminate the product

@xVENOMZx

3 жыл бұрын

@@bilbo_gamers6417 appreciate the response but 2 years too late, I’m studying chemical engineering at uni rn dude

@bilbo_gamers6417

3 жыл бұрын

@@xVENOMZx glad to help :)

Bel pezzo di chimica!

What gas is released?

I dont really get the double bond thing.. is she saying that double bond solution comes with a liquid that when mixed w/ mineralized compound, will turn to colorless solution?

@sougataghar1179

4 жыл бұрын

alkene means double bond

Wait. Isn't mineral wool the name for asbestos? Edit: Its not, but still not good to breath in

Would this work with vegetable oil?

@ataphelicopter5734

4 жыл бұрын

No

Ten years later,wow, it really helped me

Her voice is so satisfying ❤

I love how she says you need a compatent assistent XD

this is quality stuff here!

Very interesting experiment and wonderful execution.

@mayblue119 click cc at the bottom of the screen and click transcribe audio

this is amazinggg!!!!

can we use this method to find adulteration of mineral oil in edible oil?

@ataphelicopter5734

4 жыл бұрын

No. This is alkanes and alkenes, not lipids

@kevinlcarlson

3 жыл бұрын

Maybe using thin layer chromatography

but why cant we use cotton wool for this experiment?

Gr8 video

Is the pumice stone selected as a catalyst for its physical properties, or its chemical properties?

thank you so much. this is a great video!

if your teacher asked you to make notes/summarise and you don't want to listen to the whole thing, click the three dots, then click 'open transcript'

@adityashijikumar1131

3 жыл бұрын

didn't realise that lol, good eye!

Could you also test for the presence of unsaturated hydrocarbons by passing it through hydrogen and weighing it before and after with a precise enough scale?

@ahmedhossam8741

5 жыл бұрын

You can test for it using bromine water

@_Guessy

8 ай бұрын

yeah

Great

Thank you mam

Both the bromine and the permanganate can oxidize the hydrocarbons if they have double bonds. Since these oxidated compounds are colourless and their formation depletes the colourful reactant, you can witness the colour change. Eg: CH2=CH2 (colorless) + Br2 (orange) --> BrCH2-CH2Br (colorless) [ethylene + bromine --> 1,2-dibromoethane]

@ep5659

7 ай бұрын

Oxidated? I think you mean oxidized. I'm going to assume this was a brainfart, since you used the present temse, oxidize, properly. Either that, or perhaps English isn't your first language. But the chemistry checks out. No pseudoscience here.

@ep5659

7 ай бұрын

Now that I think about it, I recall this was one of the first reactions I learned about. Reacting a halogen with an alkene to replace the double bond with a single bond and a halogen. It was so long ago, I can't recall the name of it. Maybe SN1. Or halogenation. I learned this before this video was even made, so the information has gotten a bit dusty on the shelves in my brain.

*competent student*

i love her voice

Nice

hello my question is:-pumice stone which is used to clean ankle of feet, can be used as a catalyst?

@rajatkumarsingh2968

7 жыл бұрын

as in available in general store shop pumice stone is sold to smoothening ankle of leg,generally used by women.This type of pumice stone can be used as a catalyst?

@gautamc7219

4 жыл бұрын

Yes @rajat kumar singh

Thanks for the help

I'm speedrunning life right now

you need to activate the surface of the catalyst first.

POV: Dr Bell sent a link on smhw and told you to watch 2 videos

@JakeTheDrake

3 жыл бұрын

hi there trident man productions

Can anyone send me a write up

useful video despite the CRISP 240p

thanks for posting ...

This was extremely helpful, thank you very very much ^,^

@HCHalexfan its mineral wool and you can use cotton wool too

5:50 i sniff it fully when its not a dangerously chemical xd

Not what I expected

did it

where is your lab GLOVE?

the transcript from 2:06 - 2:12 :')

am i the only person in this comment section that thinks this is really cool

Burner, take care...

And at 3:28... That's the best! "and you're going to heat a palestine"

@jhyland87

4 жыл бұрын

She said "and you're going to heat the _pumice stone_ ", not _palestine.._

@djay3531

4 жыл бұрын

@@jhyland87 LOL THAT COMMENT WAS FROM 6 YEARS AGO WHY REPLY NOW

@virtualtools_3021

4 жыл бұрын

@@djay3531 callete all caps anti intellectual

Personally I thought that was hot as hell.

why does suck back occur?

@mysteriousmeteor6783

3 жыл бұрын

There is a drop in pressure in the boiling tube

my science teacher says you need to us ceramic wool not mineral wool

Staaaaa of david

Wooooooow

Nice video! If you want to learn more about the uses of oil in our everyday life, check out Fuelling Europe’s Future channel. For those who are interested there is also an interactive animation hosted on our website.

Because I'm definitely gonna need to know this, thank you so much government I'll use this every single day of my fucking life :)

@theregalproletariat

3 жыл бұрын

You chose A-Level chemistry, mate...

@daisyniamh4493

3 жыл бұрын

I’m 15 I get forced to learn this shit

@tjhotdog8229

3 жыл бұрын

@@daisyniamh4493 same

Very informative❤👏

asmr

Isn't it illegal to produce crack in the UK?

Why did she not wear gloves?

@Anthony-bz2xs

4 жыл бұрын

because there is no need.... not sure why everyone on youtube thinks gloves is essential for every single thing in chemistry....

@eduardosahagun7891

4 жыл бұрын

Because they can ignite

@sootikins

3 жыл бұрын

Better question: why is she wearing jewelry in the lab?

lol @ subtitles!!!!!!!

hi andrei

@u3nightcore271

5 ай бұрын

Yowwww

@u3nightcore271

5 ай бұрын

Bading Mj!

@jay-ci4ig

5 ай бұрын

hi lawrence - jerome

You really shouldn't wear gold rings that nice in a chemistry lab. It would be a shame if some mercury got on them.