GCSE Chemistry Revision "Electrolysis of Aqueous Solutions 1"

[@piri8315]

how does this man not have a Nobel peace prize he has saved the results of so many students😭😭

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he deserves it! he potentially decreases the unemployment in Britain, and makes more people well educated

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@@invincibleam17 Easier said than done.

[@first5minutes582]

WOW you did this in just under 5 min and my chemistry teacher waste 2 months of our lives just on electrolysis

[@kiranranpuria933]

At least ur chemistry teacher showed up for 2 months

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Kiran Ranpuria hah same! My teacher hasn’t been in for 2 months🤣

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The meeting place for Brits from all over

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Worldwide

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Newcastle

[@zafranakram3098]

@@anuaravind3188 this yr lol

[@nazmaakhtar5594]

will you please go through some higher paper exam questions for biology, physics and chemistry as I think it would really help if we got a taste of how to answer them

[@a_h5876]

nazma akhtar agreed

[@samuelayandokun4634]

Buy his revision workbook

[@zabbs]

This is the only channel I watch without an adblocker

[@_hg4rr]

😂😂

[@maddie_1122]

I've learnt more in this 4:41 video than 2 weeks of my GCSE Chemistry class.

[@azreenkarim7777]

try 2 years \

[@itzforsaken9228]

This is what our teachers want to say but don't know how to explain to us. Thanks bro idk what i would do without you!

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He ain't tryna catch a case stillllll

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[@Laluna-tq9mj]

REAL

[@MuneeshRehal]

Some very tough content made very easy by you. Your a great teacher and you're videos are extremely helpful. Just wondering where can I get the revision workbook from.

[@Freesciencelessons]

Hi. Thanks for the comment, I appreciate it. I'm currently redoing all of the videos for the 9-1 spec and those need to be finished by June 2018 (and I am on track for that). Then I can start to produce the workbooks.

[@MuneeshRehal]

Thanks thats greatly appreciated

[@Aman-ge1tp]

@@Freesciencelessons why does water form as well at the anode?

[@pablosoto7958]

@@Aman-ge1tp because water is produced my dude

[@pepsimann2038]

@@pablosoto7958 very helpful my guy

[@hxmza5538]

The time now is 8 36am of 16th of May which is when I have my gcse chemistry exam today at 1 30 😭😭 procrastination at its finest 😂

[@Sabrina-xf7ve]

Hxmza N how did it go?

[@achoo3001]

i hope you did well :)

[@fireemperorzuko8756]

@@Sabrina-xf7ve they never answer..

[@prabhleenatwal6230]

@@fireemperorzuko8756 yes they don't

[@phase0400]

@@prabhleenatwal6230 The answer, the answerr, the answerrr.

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[@adamwillett1982]

This man here helped me to get 8,8,9 for triple science mocks. If u are new to his account u need to watch all his videos. Trust me

[@A.S_05]

this man deserves more recognition because of his videos i finally understand electrolysis

[@randomviewer1285]

Can't wait till you do physics and Biology you're literally the saviour of most peoples grades you make everyone smarter and boost them to an a* (9) thank you

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A* is 8 btw A** is 9

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@@fireemperorzuko8756back then it was a* for a 9

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You are so cool man I would die without ur help

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Woahh

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[@marianmwendamberi6336]

Extremely good love your videos very simple straight to the point ,GOD BLESS YOU

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I love your videos as they are super helpful. Thank you so much.😊

[@a88a52]

No joke this guy needs an award

[@bossman69bossman32]

im gonna be sitting my gcse exams next year and when I do my exams I will come to this exact video to comment my results. I shall be in the guiness book of records for the first person to ever respond to comments asking my results ;).

[@erenskasa4970]

hey man! what were your results!?

[@jollypp4203]

I don't understand the half equations. How can we know how many electrons are lost or gained?

[@vntj316]

from their valencies

[@robertharrison3313]

JollyPP its all to do with the charge

[@elliottcooksey6886]

The charge of the ion.

[@LemonApplePear]

You should be knighted! You must have put in so many hours of your time to help students you dont even know. Very Cool :)

[@nicolejasen7700]

You seemed to have missed out the electrolysis required practical?

[@indielife192]

when shaun does a several part video. thats as exciting as it gets folks!!!😎 who is watching during covid?

[@fancy4458]

Mee

[@itsanna3]

why is the half equation for the anode OH-? where did the hydroxide come from if oxygen forms at the anode

[@sevilaybatmaz4767]

Hydroxide ion comes from the water H2O -> OH- + H+ . When it is discharged at the anode, it forms oxygen and water. 4OH- - 4e- = 2H2O + O2

[@india1846]

Water produces hydrogen, its a bit late I say that now though seeing as you asked last year lmaoo

[@oscarshalson4557]

water contains hydrogen and oxygen which comes from the aqueous solution

[@josephlangham3884]

khar it’s because water is released as well as the oxygen gas but the water just lowers the concentration of the solution, so it’s not mentioned as a released product

[@ilsashamsi7815]

I c u army ;)

[@ollie3784]

Hello Sir, I was wondering at 3:57, where is the sulfur part of Copper Sulfate is now? Is it just in the solution or something? Thank you so much though, I've finally understood more about electrolysis because of you 💖

[@Freesciencelessons]

The sulfate ion remains in solution and forms a weak solution of sulphuric acid (H2SO4).

[@gunna_enjoyer]

Bro be teaching better than my actual teacher

[@eviehooper7977]

How will I know, in the exam, what the ion numbers are for each ion?

[@sevilaybatmaz4767]

For the hyrdroxide u just have to memorise it

[@MarYam-gq9gt]

Thanks ! You explain better than my teacher at school.

[@gracielikesu]

gcses are in a week fml

[@AboodWarda]

hope it went well 🌚

[@emaan_21]

Sir, I have a question, in 4:00, where is the sulfur, is it displaced in the reaction ?

[@Freesciencelessons]

No it simply remains in solution as the sulfate ion.

[@nadine7030]

just wanted to say may god bless you save me in all my sciences

[@amayaiglesias862]

my man reteacheing me electrolysis bro my teacher could actually never. my pookie here saving lives 😞

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i would pay money to see this man at a meet and greet

[@alinawaz1091]

love your videos Keep up the great work !!!!!!!!

[@ibzinoproductions184]

I love your content

[@evezbde6529]

How can aluminium and copper be formed at the cathode when copper is less reactive than hydrogen, but aluminium is more? AND How can metals more reactive than carbon be extracted by electrolysis when they're more reactive than hydrogen too? Any help would be greatly appreciated :)

[@walidhussain7396]

Eve Zbde done with oxygen instead, e.g. aluminium oxide

[@mms3106]

The aluminium oxide is not an aqueous solution so it isn't mixed with water and there aren't any hydrogen or hydroxide ions.

[@A_-.328]

aluminium oxide reaction was not in an aqueous solution it was molten. The rules regarding the reactivity series in the video only apply to aqueous solutions

[@user-or1tp5bo5q]

When will the revision workbook be out? I'm doing the 2019 exams in summer, will they be out by then?

[@Freesciencelessons]

Yes I'll be releasing Chemistry 1 soon.

[@ellansa4178]

this man is a legenddd

[@fivestar.09]

what a legend, but im still slightly confused, so hydrogen is discharged (at the cathode) if the metal is more reactive than hydrogen, but what about at the anode? When does hydroxide get discharged?

[@Freesciencelessons]

The hydroxide gets converted to oxygen (which is discharged) and water. However, if a halide ion is present (such as chloride), then the halogen is discharged at the anode, rather than oxygen.

[@fivestar.09]

@@Freesciencelessons ah, thanks alot

[@victoriaraulet3859]

sorry but i dont understand why hydrogen would be produced first at the cathode if it is less reactive than the metal ,as this would mean it would react slower therefore it would be harder for hydrogen to gain the electron

[@Freesciencelessons]

Sorry for the late reply. At the cathode, elements accept an electron (ie are reduced). Very reactive metals such as sodium LOSE their outer electron very easily, so it's very hard to then put an electron back on at the cathode. Hydrogen (from the water) will accept an electron more readily than reactive metals, so if we electrolyse an aqueous solution containing a reactive metal, we get hydrogen reduced at the cathode rather than the metal.

[@tedt]

This guy is the top geeza. Thanks mate

[@Localguitarman]

god bless this man

[@Lm0i7-i3u]

can someone help, i dont understand the half equation at the anode. Why are the number in front like that specifically like why is it 4OH-

[@nisalperera1868]

Really helpful! Hope more people knew about this

[@dexpuma]

when nickel is more reactive than hydrogen then how is nickel salt electrolysis possible ?? shouldnt we get hydrogen on the cathode??

[@Name7.62]

Hi sir, I really can't understand why we produce water at 3:48- I understand why oxygen is produced and that the OH- is from the water but I just cannot for the life of me work out how the water is made- sorry to be a pain.

[@Freesciencelessons]

You don't need to understand exactly how the process takes place, only the equation that I show at 3.48.

[@Name7.62]

@@Freesciencelessons Ok that's great, thanks for the quick reply. I just want to thank all your hard work and perseverance to create these videos, yesterday I did my biology mock exam and I can honestly say it was by far my best mock, which is great considering it was previously my worst subject.

[@Freesciencelessons]

Thanks. I'm glad that the videos are helping. Good luck with all your mocks.

[@sevilaybatmaz4767]

@@Freesciencelessons so we have to just memorise that hydroxide equation? :(

[@t.4861]

Dear Shaun You have helped thousands of students get higher grades and i was class of 2020. Passed my science mocks. Thanks to you. Not only me but thousands of students. So thank you for being the reason we pass science and get a science a level good sixth form choices. Thank you Shaun May your soul rest in peace 🙏🕊😭 #Rip_Shaun

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He's alive, he literally made a video 4 days ago. Don't do that shit bruh hes literally saving lives and changing them I swr my heart dropped when I read this don't spread fake info

[@kopy5812]

Sir, at 2:55 i looked through every electrolysis video on your channel, yet still have not seen an explanation on why oxygen is formed at the anode rather than the sulfate.

[@Freesciencelessons]

It's fully explained in this video GCSE Science Chemistry (9-1): Electrolysis of Aqueous Solutions 2

[@zn8184]

How do you know what the ion is for each element? For example, how do you know copper has a 2+ ion?

[@wtseg6533]

copper has two electrons in the outer shell. when it forms an ion, it loses the two electrons to gain a full outer shell, giving it a 2+ charge, so it becomes positively charged.

[@user-xd4sk4pk7h]

Some you can work out from the periodic table others you have to learn- eg transition metals

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Our national treasure ❤

[@Amazingness-if-that-is-a-word]

International treasure

[@marymmoon1190]

how do u know SO4 is 2 minus is it one of those ones where u just got to accept it?

[@tris286]

me frantically watching all his videos before my exam tmr💪💪

[@mika1057]

Hello sir, How are we meant to know the reactivity series for the hydrogen being produced at the cathode?

[@tayacarver5077]

So if the hydrogen ions do not go to the cathode then where do they go ?

[@Freesciencelessons]

They simply remain in the solution.

[@aniawo5119]

Sir, may I ask a question? Why less reactive copper gets reduced on cathode? Why not more reactive hydrogen gets there first and get into reaction on the cathode? I don't get it, not logical to me 😔

[@Freesciencelessons]

Hi. Sorry for the very late reply. When metals react, they lose electrons. Reactive metals such as sodium lose electrons very easily whereas less reactive metals such as copper do not. In electrolysis, electrons move from the cathode onto metals (or hydrogen). It is easier to transfer an electron ONTO a LESS reactive metal than onto a more reactive metal (since they tend to lose electrons). Hydrogen is more reactive than copper, so hydrogen is more likely to lose an electron than copper. This makes it easier to transfer an electron ONTO copper compared to hydrogen.

[@maariyamahmood3636]

what happens to the sulfur in the electrolysis. if copper is produced at the cathode and oxygen at the anode, where does sulfur go

[@anonymousog9608]

maariya Mahmood The sulphur remains in the electrolyte

[@yaziz8687]

do you know why sulphur remains in the electrolyte and why oxygen is at the anode instead?

[@Name7.62]

@@yaziz8687 Basically sulfur remains in the compound SO4 (sulfate) it doesn't split. As sulfate is a compound and not a halide ion, it's therefore not produced at the anode. Also, if you're wondering where the oxygen actually comes from, it's from the OH- ions (not the SO4) which explains how water is formed also.

[@mattie_sizer7187]

hello sir, i was wondering, how do you know what the copper sulfate solution forms, how do you know what ions they form and do we just have to simply learn them or is there a way of knowing?

[@athdasaeed3677]

You have to just memorise them

[@dylangrayson7682]

This guy is such a legend holy shit

[@litmuesli6490]

Super helpful videos, thanks!

[@simranhans8806]

Hi sir I don't get this. What eventually happens to a gas if its pressure is increased?

[@Freesciencelessons]

It will turn into a liquid. As the gas molecules get close, intermolecular forces establish and they condense (as long as the pressure is kept high).

[@simranhans8806]

Thanks sir, just quickly, what is the pressures name?

[@marthaseeney5702]

Still so helpful in 2019

[@zara8014]

2020 too

[@RandomGuy-qt1nf]

U think the rules of chemistry changes every year? Lmao

[@fancy4458]

@@zara8014 yeah!

[@ali.mp3410]

2021 too

[@TamilEelam1]

@@zara8014 No exams 😂

[@roarroon1666]

Why can water electrolised if it has a covalent bond?

[@Freesciencelessons]

Because a tiny fraction of water molecules ionise to form H+ and OH-

[@Doodo981]

Do we get the reactivity series in the exam or do we have to remember that copper and silver is less reactive than hydrogen

[@alexireade3408]

Bradley Morris remember it

[@reuben6896]

we do

[@amelie574]

remember it like this: please (potassium) stop (sodium) calling (calcium) me (magnesium) a (aluminium) careless (chlorine) zebra (zinc) instead (iron) try (tin) learning (lead) how (hydrogen) copper saves (silver) gold and then platinum is last so you just have to remember that one😂

[@deerosete8117]

"You all have lost chunks of learning time..." Me: [Panik] Freescience: I gotcha Me: [Kalm] "... so we are considering removing Triple." Me: [Panik]

[@ameliat8336]

At 4:12 can anyone explain what these half equations for? Are they the half equations for anode and cathode in aqueous solutions or Half for copper sulfate or the half equations for cathode and anode in General???

[@Freesciencelessons]

The equation at the cathode is specifically for the reduction of the copper ion, although you can also apply that for any other metal ion if you adjust the number of electrons. The equation for the anode is for the production of oxygen. This happens whenever we are using a solution which does not contain a halide, so for example a sulfate ion in the case of copper sulfate.

[@Cheekymeerkat]

Why is water a product at 3:51? I thought it was just oxygen produced

[@sxm9998]

its aqueous meaning its dissolved up in water

[@acr7780]

Sir, please help. I am struggling to understand why Oxygen is produced at the anode, and not sulfur.

[@Alex-mo5tz]

ACR It's because oxygen is always formed unless the non-metal is a halogen (from group7). Sulphur is not in group 7 so oxygen is formed instead

[@abc12369]

Alexandra cheers 👌👌👌

[@BladerINCThe_Hope]

Alexandra another thing is, if the anion is more reactive than Hydroxide than Oxygen will be produced, but if it is less reactive than the anion will be produced...

[@girlthatcooks4079]

@@BladerINCThe_Hope how do we know if it's more of less reactive than hydroxide

[@Freepalestinefromisnotreal111]

Sir,what happened to the the sulfate at the end?

[@aaronjoseph4549]

To sacrifice my life for Free science Lessons

[@Ddhtghggk]

do they give the charges of copper and sulfate ions in the test or do we need to know them

[@orquediasa]

you need to know sulfate but I think they give us copper

[@overpowered5919]

finally I get this topic thank you sir

[@minitrix1579]

the smile at the end is awesome xD

[@mohid9843]

may i ask....will we be given the reactivity series in the exam? thanks :)

[@Freesciencelessons]

You are not given the reactivity series in the exam. I would recommend that you watch my video on the reactivity series as it tells you what you're expected to know (you do not have to learn the whole series).

[@itstheguy..4036]

Great video sir! How did you get the half-equation at the anode? I don't understand.

[@Freesciencelessons]

Remember that the non-metal ion loses electrons at the anode. So for example the chloride ion is Cl-. This loses one electron ie Cl- - e- ----> Cl However elements such as the halogens (eg chlorine) form molecules with two atoms covalently bonded (these are called diatomic molecules). So we need to double the equation to show this ie 2Cl- - 2e- ----> Cl2

[@itstheguy..4036]

@@Freesciencelessons oh ok thanks sir, but i was asking about the half-equation at the anode here 3:43

[@Freesciencelessons]

Water naturally ionises to form hydrogen ions (H+) and hydroxide ions (OH-). The hydroxide ions are oxidised at the anode (ie lose electrons) to form oxygen. I would recommend learning that equation.

[@zecdi]

@@Freesciencelessons why is it 4OH- though ?

[@stardreamix786]

@@zecdi as if u did OH- by itself, the products don't look right (at least what i think) i am still confused too, but i'll just remember 4OH-

[@Mrslovetomatoes]

why are oxygen and water produced at the anode? What happened to the sulfate ion?

[@sevilaybatmaz4767]

The sulfate ion stayed in the solution

[@sevilaybatmaz4767]

Oxygen and water are produced from the hydroxide ion

[@nikkfoodz285]

Hi, can u please tell please tell which gas bubbles after some time at +ve electrode during electrolysis of Conc. NaCl??

[@choojunwyng8028]

Why does the Hydroxide ion react with the anode but not the sulfate ions?

[@DhanaCorpuz]

So the sulphur from the sulphate can't be extracted using electrolysis?

[@jamessykes8756]

Do we just need to learn that a sulfate ion is 2 minus or can this be worked out?

[@Anush_Sivakumar]

is there a donation link where i can donate this man he is a legend p.s - i wont be able to buy his books

[@eannamcnamara9338]

I want to ask in the comments. Why is O2 produced at the anode. Should it not by hydroxide or sulfate not oxygen. Thanks in advance!

[@Freesciencelessons]

The oxygen is produced from the hydroxide ions which are released when water molecules ionise.

[@Krn_sndhu]

Sir, how did the reaction at the anode have a product of 2H2O and how do be have 4 hydroxide ions?

[@fireemperorzuko8756]

It's balanced, the products are: OH -> O² + H²O, but this isn't balanced so to balance it it's: 4OH -> O² + H²O

[@pool718]

@@fireemperorzuko8756 what happened to the sulfur from the copper sulfate?

[@khattakjarir3399]

@@pool718 innit im asking same thing

[@khattakjarir3399]

@@pool718 after digging through the comments sir replied and goes "The sulfur stays as a sulfate ion in the solution"

[@haroonali9758]

Why is the layer of Copper metal needed around the cathode?

[@Ahmed-kh5xp]

ill donate my left and right kidney to you

[@tasfihaislam3673]

what happens to the hydrogen if it is not reduced?

[@soham7316]

what is left behind in the container after the copper and oxygen is out? I'm thinking sulfuric acid?

[@Freesciencelessons]

That's correct.

[@Hannahlolz]

I dont understand the half equations for how oxygen is produced at the anode... where does the oxygen come from?

[@darshan7771]

from aluminium oxide, the aluminium goes to the cathode, oxygen goes to the anode

[@JamesHoyle.]

Oxygen gas is produced from the OH- (hydroxide) ions. These are found the in water (H+ and OH- ions in water) that the electrolyte, in this case Copper Sulfate, is dissolved in.

[@MF-wg5xy]

do you know the half equation for anode..i didnt quite get it..it says 4 oh- +something..Please need anybodys help about it?And how he got exactly 2h20 from??

[@Freesciencelessons]

The four hydroxide (OH-) ions lose four electrons (4e-) to make oxygen (O2) and four water molecules (H2O).

[@tolberto8340]

Can anybody explain why at 2:30 ?

[@archjanasivasuthan6252]

Bit late to answer your question but just think that the least reactive one is the one that's produced. So if hydrogen is less reactive than the metal then it will be produced and vice versa.

[@AnjishnuSau]

you are the goat

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CHEMISTRY TOMRROW ANYONE??

[@nazeerahmed1230]

really helpful

[@simrett149]

how do we know that the OH- ions are discharged instead of the sulphur ions?

[@theSamaraie]

is the reactivity series given in EDEXCEL gcse ?

[@hai_no_tenshi186]

Hello to all those here the night before chemistry gcse 2022

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