GCSE Chemistry - Electrolysis P2 - Electrolysis to Extract Metals From Oxides - Explained #41

[@anastasiaanautodidact9856]

nothing less than excellency! you've explained it in five minutes better than teachers did in 9 hours .

[@Cognitoedu]

Thanks Anastasia glad it helped!!

[@divyavarghese6232]

It was standardised...and the visuals helped a lot....teachers can't demonstrate experiments as visuals unless u go to a lab and there teachers can only show you what is in the limits of the lab....she can't just heat something upto 2000 degrees in a school lab

[@louisstanfield4872]

sadly you are too silly to understand simple chemistry and see all of the mistakes in this video you doughnut

[@JolyneCypher]

Some teachers r good some are bad but i bet none have a whole lab filled with melting chamber thingys and electron microscopes and accurate electrolysis equipment.

[@Jacobinks]

Roblox

[@Cognitoedu]

Hi everyone - we've got two mistakes to own up to here! 1 - the formula for Aluminium Oxide (at 0:20), should be Al2O3, and *not* Al3O2. 2 - the battery should be drawn with the shorter lines (the negative terminals) on the left, and the longer lines (the positive terminals) on the right. Sorry about that

[@shaziashah8645]

do a face reveal lol

[@CobaltMagmaStudios]

you made a mistake....pigs are flying....am I dreaming?

[@kirishima8897]

at 3:44 there were three oxygen atoms, so whered the fourth one come from

[@subaitasubaita3051]

please pin your comment

[@kaverimehta7848]

As If I care. Your teaching is so cool that not even nobody will see the mistake 😎 (Inside joke…Percy Jackson Reference)

[@vibes.5470]

Sir i have huge respect for you, i just discovered your channel, and now you helped me clear out something my teacher couldn't in just 4 minutes, short and simple. Thanks you Sir.

[@jaromedovey3174]

'' i spent all my time on chemistry'' gang where you at

[@amiie5069]

Real

[@Victorque.]

Real

[@elliot5950]

Real

[@J6K3R]

Not relateable 😢

[@shahmir5445]

Real

[@madeleinej6048]

Finally , someone who can teach me the stuff I actually need to know all combined into one short video that I don’t get bored of, leave breaks so I am able to think bout what has just been said AND have all these videos for free for biology physics and maths as well, I appreciate this so much! Keep up the amazing work because this is how students should be taught. Everyone is saying this but I have learnt more from watching your videos than I have listening to my teacher for almost the whole of year 10. From the bottom of my heart, thank you! 😊

[@Cognitoedu]

Ah thank you so much Madeleine, it's so lovely to receive comments like this. Really glad you're enjoying the videos and that you're finding them so helpful 🤩

[@Nasim-k4m]

Please open a online center 🙏

[@ADHAY-CHAVANKE]

5 YEARS LATER STILL GOLD HATS OFFFFF!!!

[@nebula-collector]

Good luck to all on chemistry tomorrow.

[@Qarxyu]

I’m cooked

[@fyrazz7695]

@@Qarxyu lol

[@rhoonelld2780]

Thanks bud

[@kiraa-han]

im failing

[@clouds8354]

I hope both sides of your pillow are cold because you're a lifesaver

[@DrK-qi6gr]

Amazing lecture man, you taught me more than my chem teacher as usual

[@Jacobinks]

Chem ahh 😱

[@miraculoussimpson6785]

I swear this channel has helped me so much I can’t even express my gratitude for this channel 😭😭

[@techiester8311]

There is only one difference between chemistry students, many miss out on cognito ;)

[@ayeshathebanana]

u explained in 5 minutes what my tchr couldnt for 3 classes

[@omagah7152]

Thanks for saving my exam 🙏 Our teacher literally doesn’t explain anything at all and you explained it better in 6 minutes than he did in 4 classes

[@plopfizzy]

I teach science and regularly show your videos to my students - visually simple yet effective. Huge well done from me :)

[@gracerobins9751]

thanks so much for listing the tiers this is for! i’m higher and i’ve been worried i’m only revising foundation- thanks a lot for this x

[@QiratAintcring3]

words cant explain how much i love you teacher

[@n0t.t148]

chem paper 1 tommorow i might be cooked

[@katieluxon6732]

i know i am

[@Herobrine23497]

May allah give u Lamborghini because u explained in such a very good way

[@kianepaulo1541]

You are the best😭😭you have my respect. You are the best👏🏼👏🏼

[@aathirar4862]

Thank u so much!!!!! I usually don't comment but this explanation was wayy too good not to. I didn't quite get this topic at first when it was taken in my class but now I understand 💯

[@terryattard1889]

I really love these videos. I do electrolysis on a very frequent basis - that's how I found these videos while browsing. However, I cannot wrap my head around putting that molten metal into a beaker. I think "crucible" is the word you're looking for sir! :)

[@agmakes4639]

Who’s watching this cause of online lesson

[@snowflakearticice1642]

Me

[@omarabobasha1895]

Bro they are literally useless this guy here is a savior (A LEGEND)

[@mattbanks3517]

I want to make pure iron from low quality iron ore.

[@claraishungry501]

me :'( online classes suck

[@ChisimdiOtaluka]

I love this channel so much and I thank everyone involved in it

[@ollielax2671]

Very good, thank you. Shouldn’t the battery be connected the other way, or the electrodes swapped? I say this because I think the electrons will be repelled towards the anode, and the positive ions repelled towards the anode?

[@ollielax2671]

Sorry I meant positive ions repelled towards the cathode

[@Cognitoedu]

Hi Ollie, Yes you're completely right! Sorry about that - we've drawn them the wrong way around! We've pinned a comment at the top to address this.

[@ollielax2671]

Hi thanks for the reply. No problem at all.

[@rachelsteve5581]

I didn't understand this.

[@bbruqiaazami9199]

@@rachelsteve5581 think of it like this: the conventional flow of current is positive to negative and the electrons are transferred from the anode ( the positive terminal ) to the cathode, right? now the positive side of the battery is drawn towards the cathode rather then the anode and the current can't flow that way. therefore the cathode ( the negative terminal ) will repel the electrons cuz like charges repel... I really hope this makes sense and helps you! :)

[@lewishancock2808]

3:24 How do you know these atoms are positive or negative? does it show it on the periodic table?

[@lewishancock2808]

@Ashika UPADHYAY Thank you so much :)

[@Alan-09363]

@@lewishancock2808i can’t see the comment what was the answer

[@get.sent1]

@@Alan-09363 yh what was the answer

[@ClaraMorri-yn6rw]

you have made me the king of electrolysis

[@sjd_1111]

No

[@AnitaMohan-g7p]

I am a chemistry teacher, and i noticed that your electrolysis diagram's battery is wrong. The positive side is connected to the cathode, and the negative side is connected to the anode. This will cause the current to not work, as it should be the other way around. My ninth grade students pointed this out, and I just wanted to point it out in case anyone needs the help. Overall, I really enjoyed your explanation, and this was a helpful video.

[@thesausageman5388]

Ninth grade? If you’re American, why are your students watching UK-Based GCSE vids?

[@xuanwenwong8341]

Thank you for pointing it out! I was so confused

[@zaimzulkifli8976]

Look at the top comment, he corrected it his mistake 4 years ago

[@kovidmaniktalia2870]

@@thesausageman5388 electrolysis in america isnt different and this could be better than the vids in America

[@Herobrine23497]

Hun

[@Muhammad-y3u1y]

at 5:43 shouldnt the state symbol for the aluminium on the products' side of the reaction be solid and not liquid??

[@BobMarley-yz4wh]

Thx. Really helped. Keep the vids coming

[@Cognitoedu]

That’s great to hear - thanks Abdul :)

[@AbdullahKhan15]

@@Cognitoedu You mean 'Bob' right?

[@user-ky5ev6sk1q]

@@AbdullahKhan15 do u know him irl?

[@9ul0oi]

@@AbdullahKhan15 they changed their username as the comment was 2 years ago it might have been abdul!

[@jaiden4775]

@@9ul0oi these guys r so dumb 🤣🤣🤣🤣

[@anooshatapes]

Thank you!! This is gonna be in my test and I didnt understand it, I do now :))

[@thingy8814]

5:37 it was Al2O3 then it turned to Al and O2…what happened to the other O if it was O3?? I feel so dumb right now istg

[@zaimzulkifli8976]

Isn't the oxygen supposed to react with the graphite to form carbon dioxide after being discharged since it's hot enough?

[@rachelsteve5581]

Thank you for this video. Helped me a lot

[@nithilayonal4881]

At 5:44 shouldnt the 4Al be solid?

[@camxvinga]

when it cools it will be solid it has been kept molten for the reaction to work but will cool after

[@dennisyang9561]

I am pretty sure in the power source the positive terminal goes to anode (negative) and negative terminal goes to cathode (positive). Anode is where oxidation happens and has negative potential. Cothode is where reduction happens and has a positive potential

[@novaastronomia8720]

Well, that is in the case of galvanic cells. It's the opposite in the case of electrolysis. To know more you can look it up.

[@xuanwenwong8341]

Anode is positive while anion is negative. Cathode is negative while cation is positive.

[@ggmumanchersterunited3523]

on the diagram don't you have to draw thhe cell the other way around?

[@benburdsall1170]

Yes he has, the cell with the short line is the negative and is therefore the cathode and not the anode as shown

[@Big_Topic]

Why do the oxygen ions only escape into the air when their electrons are removed and not earlier? Is the strength of attraction of the anode greater than the upwards force?

[@minaalwaseem3976]

because its in ion form in the solution so when it removes electrons to the anode it becomes O2 gas so can float off

[@chrislawrence4601]

Your formula for aluminium oxide at the start of the video is incorrect.

[@Cognitoedu]

Cheers Chris just flagged it in the pinned comment 🤙

[@The-big-boy]

Such a good video!

[@f1community656]

If there is more than one lot of ions that go to an eletrode do the less reaction ions gets formed and the others displaced?

[@shafiops]

getting ready for chem mocks

[@Joshua.Ezekiel]

0:23 aluminium oxide is Al2O3 not Al3O2

[@ahnaftanzim1452]

You guys can also watch Tyler Dewitt's videos on Electrolysis,Electroplating,Galvanic cell.But some topics are left out there like Electrolysis of Aluminum Oxide and Electrolysis of Aqueous Solutions.For that you can watch free science lessons videos.

[@BrendanHolt-rh5gf]

I am so stupid!!!!Oh god save my chemistry!!!

[@nancyaldebany3372]

Thank you, really helped.

[@marklinow01]

do other metal ores also get mixed with cryolite or is another process required for that?

[@waleedomari8042]

0:31 I thought Aluminum Oxide was Al2O3?

[@tarangvankar]

When the oxygen reacts with the carbon anode, does it not react with the carbon to form carbon dioxide?

[@aliabdullah6753]

1.There is nothing called a carbon anode 2.Carbon dioxide is formed in the reduction of the carbon method 3.Carbon dioxide cannot be formed in the electrolysis method I MIGHT BE WRONG

[@arishahussain8130]

Yeah the carbon electrode is also known as inert electrode The O2 gets dischrged at the carbon anode and due to hight emperature reacts with carbon in the the carbon anode to form co2 gas

[@indian-tech-support]

@@aliabdullah6753 carbon reacts with oxygen to create co2 and that's why you have to replace the anode

[@grakoe]

@@indian-tech-support yeah you’re right

[@mazensakr991]

can anyone explain how i can balance the overall equation

[@takreemwazeem]

Thank you bro! learnt alot

[@jakebaldwin1308]

Who’s here NOT because of an online lesson?....

[@unxtraordinary]

Practice chemistry paper 1 test tomorrow lmao :D

[@saltedbarofbutter]

I am just here cuz I like to watch this man's video. Besides, this knowledge is definitely going to help on any electrolysis questions.

[@ggs-r4i]

Thank you so much your the goat 😂

[@abhishek8797]

This helped me so much

[@ahmedehab1921]

thank you it was really helpful

[@nwuyuc]

Thank you, I understand now.

[@dishwi0]

Is this for higher or foundation?

[@btwzoyaahhh]

Even though `I am studying at CIE Cambridge IGCSE... These videos are helpful

[@ivrystaychill2370]

Love this lots of help

[@ahmedzahid5128]

Good work

[@big_guy6507]

Uh... Is the cathode and anode not the wrong way around in regards to the battery?

[@IlTheOnelI]

it is

[@omairthelegendgaming6191]

By the way the diagram is wrong the battery is supposed be swapped as the same issue was in electrolysis part 1 As well as positive (longer line) always faces anode and shorter line cathode

[@MohamedKaisaan-d7v]

Wait..can someone tell me why aluminium is liquid at the end? Bcs i thought it was gonna be metal?

[@kiiarra]

In solid the ions can't move

[@MohamedKaisaan-d7v]

Oh okay thanks

[@aboodalkosa1]

shouldnt he have used the shorter lines on the left?

[@NoOne-yv2ei]

Wait… if you melted the ionic compound wouldn’t its heat melt the electrodes?

[@Big_Topic]

Not if the electrodes had an even higher melting point

[@NoOne-yv2ei]

@@Big_Topic what if it doesn’t? People usually use graphite or platinum, but their melting points, while higher, are not the highest.

[@hazel-wm8ed]

i dont understand why the half equation isnt the 2Al+^3+ 6e- -> 3al why is it just Al not 2al

[@grakoe]

The reason why the Oxygen ion has a 2 is because oxygen is diatomic which means that having one ion cannot make a diatomic oxygen molecule, so you add a 2 on the left. For aluminium you only have one ion and one atom so there’s no need for balancing it with adding a coefficient

[@akeibazli8942]

How come the product gave aluminium as liquid state? Can u elaborate pls.

[@theauburnfirefox8767]

Akei bazli I’m assuming it is because it was molten liquid to begin with though I may be wrong

[@tayyabjanjua3255]

the solid liquid was heated and therefore state changed to liquid

[@sweettoy3824]

"oxygen is being oxidised" very interesting

[@nawabmurtaza]

If u hv trouble remembering the Neumonic Remember " AN OIL RIG CAT "

[@mahinourkhaled2640]

Why did we use carbon for the electrodes

[@ihsan2837]

Good conductor of electricity

[@xiiaowai7472]

And also cheap Plus it won't involves in electrolysis process

[@asadiqbal1882]

Sir your subscribers and views are too less then you deserve ❣️

[@Cognitoedu]

Ah thank you so much Asad 😊

[@asadiqbal1882]

@@Cognitoedu keep growing more and more☺️

[@saphiakhidir3278]

i think you made a mistake at 5:08 as reduction is loss of oxygen and oxidation is gain of oxygen but you said it the other way round

[@omar.t975]

nope, there's a little way to remember which is which, its called OILRIG Oxidation Is Loss of electrons Reduction Is Gain of electrons Hope this helps :)

[@hamzaibrahim8457]

@@omar.t975 but in the last video he said the opposite for extraction of metals

[@hamzaibrahim8457]

really confused here

[@omar.t975]

@@hamzaibrahim8457 so theres 2 types of reduction and oxidation, If you say sodium was oxidised, it means you added oxygen to sodium If sodium oxide was reduced, you took away the oxygen from it so now it's just sodium OILRIG is talking in terms of electrons So sodium is oxidised as it loses electrons to become positive Oxygen gains them electrons from sodium to become reduced I just used sodium as an example by the way.

[@CallMehAngel207]

No, so basically, when it comes to OXYGEN the oxidation is gaining oxygen and reduction is loss, but when it come to ELECTRONS then oxidation is LOSS of electrons and reduction is GAIN of electrons

[@IbPrivate-r2q]

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[@amritkalsi8077]

i still dont get it

[@ryze5436]

Maybe try free science lessons

[@samira8485]

Thank you so muchhh

[@RaoufZaman]

Mashallah ❤❤

[@zul718]

Bruh the equation for aluminum oxide i al2o3 not al3o2

[@Nitroade24]

aa

[@Amiraayah-b8w]

AHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH I HATE SCHOOL

[@QuranEveryDay-h7b]

Your positioning of the cathode and anode is wrong . Flip them around

[@AB-lz5io]

I'll get an A from all my sciences and let you know. Right now, I am C or B level

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1 summer break later and here I am again

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@@AB-lz5io so what’d u get

[@AB-lz5io]

@@ihsan2837 A

[@ihsan2837]

@@AB-lz5io Nice

[@AB-lz5io]

@@ihsan2837 thx

[@brutalbomber3721]

Its Al2o3 not al3o2

[@sunnyeziboy4984]

I think your cell symbol is another way around

[@fantasticfour8507]

Man I wish i did GCSE..8.4.4 is just UGLY

[@Herobrine23497]

May God give pizzas every night

[@kiraa-han]

i hate this topic so much seriously i can never undederstand this

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This shit is so confusing

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oil rig it is

[@shapansarker1]

100 comments :D

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That FAIRS

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ily

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amogn us