GCSE Chemistry Revision "Oxidation and Reduction in Terms of Electrons"

[@imbiork]

This guy is a total legend in my school! You save our grades and enlighten our stupid minds.

[@shub9107]

The human being,is a superior creature,and is potentially perfect.

[@KamisatoElias]

@@shub9107 frankly we're anything but

[@willme2297]

He’s a really cool guy

[@lokilaufeyson3602]

SAME HERE! We all made fun of it in yr 8 and now 2 years later these lessons helped me so much! Genuinely really appreciative :)

[@SStupendous]

@@shub9107 Humans potentially perfect, superior creatures 🤣🤣

[@rogersnuclear]

Hi, Sorry to bother you, but if possible could you please change the colour of the highlighted text in future videos, as i am colourblind and although i can see that it is there, I can not read the highlighted text. if possible a colour very different to the background colour world be highly appreciated e.g Red, Green, Yellow. Thank you

[@Freesciencelessons]

Yes that's not a problem at all. I'll make them yellow from now on. Let me know if that helps.

[@rogersnuclear]

Thank you :)

[@patriciaalconvaldes1116]

Ethan Rogers I

[@dippic3562]

legend

[@Ellie-hj6qr]

Such a gem

[@BB-us8sz]

i got a 7 in gcse chem with the help of your videos. thank you for helping me through gcses, i will definitely be using your channel for a levels! 😁

[@maddiewood6671]

well done!

[@sushruthravishankar7200]

hhe don;'t post no A level videoss tho?

[@aryans9334]

@@sushruthravishankar7200 he is literally uploading new a level videos

[@Reece3333]

update?

[@zq1921]

How you doing with chem so far?

[@joshuaasika2634]

I've got a chemistry test in two days and I'm not really good at chemistry but this man has really helped me to understand the basics. Thank you sir.

[@Freesciencelessons]

No problem at all and thanks for the comment. Good luck in your test.

[@joeconnor9466]

How could people dislike this video he is the best science teacher I know all the ones in school are shit

[@haechano1fan]

why tf can’t i understand oxidation and reduction man

[@Izzywildflowerr]

so real and im doing it as holiday homework for year 11 i wanna cry

[@BadKarmaWillCome]

i remember it like: "oil rig"- Oxidation Is Losing (eletrons), Reduction Is Gaining (eletrons) unless you dont understand how it works?

[@kylemcallister1369]

O- Oxidation I- Is L - Loss of electrons R - Reduction I - Is G - Gain of electrons

[@Belacroix5]

Chemistry is so difficult!

[@Freesciencelessons]

It can seem that way. It just takes time.

[@rishiyadav9007]

@@Freesciencelessons if i want to do biochem in university, what is the minimum grade required to be eligible (or something)?

[@fireemperorzuko8756]

@@rishiyadav9007 it depends what university I think, but I'd say the minimum is a 6-7 maybe

[@TamilEelam1]

Hi Sir! I will be sitting my GCSE Chemistry exam in a few more hours. I thanks you for all the help that you provided and the countless hours you have spent making these videos! You have helped me with my mock exams and I am sure that these videos will help me with my GCSE’s later today! Thank you and wish me luck 🥳💪🏾 P.S - Unlike other comments who never reply about how they did, I will reply to those who ask. That’s a change, isn’t it 😂

[@youflippingdoghnut3085]

I know it's late but how did you do :))

[@rl_clips_highlights1065]

How did u do

[@tr1lux977]

pretty sure he said he would reply

[@billieswig8658]

did you get the results yet?

[@riri_bbk]

damn broke ur promise

[@gracefleming7232]

3:14 how do you know it is Zn +2, I don't understand how you can tell it forms a 2+ ion from looking at the equation. Can anybody help? Thank you so much for making these videos.

[@Freesciencelessons]

There is no easy way to tell from the equation so in the exam they would have to tell you. Infact, if you look at the product (ZnSO4), we know that the SO4 has a charge of 2- so the Zn must have a charge of 2+ but that's beyond GCSE.

[@mayahughes5214]

Freesciencelessons few I thought I’d have to know for my exam

[@aliza672]

Freesciencelessons how do you know SO4 has a charge of 2 -

[@jubileej1629]

@@aliza672 they just tell us so we have to accept it ?

[@abed4193]

@@jubileej1629 if you go onto aqa 'datasheet' formulae of some common ions, there is a whole list for the transition metal ions and that should hopefully help :)

[@ellacook3295]

Mad love for Shaun. He’s the only person that’s going to get me through chemistry 💞💞

[@jessicahornby6026]

Thank you so much I haven’t been able to understand half equations at school but you explained it so well

[@gotem6891]

hey i just wanted to let you know that you really helped me with my science exams this year!! i binge watched all of your videos on the weeks leading up to the exams and the night before each and because of you, i did really well in my science exams and i got really good results so thank you so so much!!!

[@Freesciencelessons]

No problem, I'm glad I could help. Thanks for letting me know and good luck in all your future studies.

[@gotem6891]

@@Freesciencelessons thank you again :)

[@rashane4328]

Thanks for keeping it short and simple yet easily understandable

[@zoey3605]

Hello sir! Thank you for the video. Quick question, would we be given the ionic charges in the exam or are we expected to remember them? If so, is there some sort of pattern that helps with remembering them?

[@Freesciencelessons]

You are meant to know that group 1 metals form +1 ions and group 2 metals form +2 ions. Group 6 non-metals form 2- ions and group 7 non-metals form -1 ions. Aluminium forms +3. Anything else you would be given.

[@zoey3605]

@@Freesciencelessons Thank you!!

[@Celeste_51]

@@Freesciencelessons thank you sir, that’s so helpful! :)

[@mahdidad8252]

​@@Freesciencelessons😊

[@stormyprawn]

Shaun's always coming out with the most dapper of suits. Respectfully, sheesh.

[@omermasood3241]

Tomorrow's my test on this topic. With the help of your concept, I got full marks! Thank You Freesciencelessons!!!

[@AveCastGames]

If it’s tomorrow, how do you know what you got?

[@westanyou2756]

@@AveCastGames fortune teller

[@saeed6134]

Exam in two hours..

[@SpellFire]

How'd it go?

[@Chickenlva]

Asks literally 6 months later 😂

[@dimeballsydagger6319]

Top Dog lmaoo

[@atube9190]

Exam in 20 mins

[@akkiok8242]

@@atube9190 how did it go

[@roveish]

This guys the reason I’m not gonna completely fail. Thank you 🙏

[@bubble_ator]

you have helped me so much i have been struggling with chemistry and physics immensely but thanks to your channel i feel inspired to learn and i have gained so much more confidence thank you for all your amazing videos

[@khadijahammad9446]

hi, I just came across your video and wanted to thank you for making them. 3 years ago I did my gcse's and watched all of your vids for science and it really did boost my grades and I dont think I could've achieved my A*AA in science without you. thanks very much!

[@unaestrella1876]

Holy crap imma watch this man's videos now thanks my guy 😂

[@tallguytoby1843]

my mans what music do you play at the start it slaps

[@baharsabet2895]

morning walk by jingle punks :)

[@blinded2790]

You said in order to figure out which element is being reduced/oxidised in a symbol equation we would need the ions present, would those be given in an exam? If not how would we work those out. (2017 GCSE specification)

[@Freesciencelessons]

Everything you need will be given in the exam. They're testing your understanding of the ideas.

[@tomshawuk]

You can actually work them out. If you want me to show you how reply to me, and ill write back explaining how.

[@yasinkhan9675]

How can you work them out?

[@unaestrella1876]

Well some we can work out, but the metals in the middle we can't so my teacher said they gonna be given to us. Say lithium has only 1 electron on the outer shell, it kicks the electron out and therefore since the one negative charge is gone Lithium becomes Li+ right?

[@nadarajahyoganathan1024]

@@unaestrella1876 yes thats correct

[@sorrelpurdy6729]

your brilliant and have helped me understand so may topics for my GCSE's! THANK YOU SO MUCH !!!!

[@audreynoumsi9887]

I really appreciate the teaching , it 's simple to understand

[@muskaansayed4121]

Sir i am an igcse student... Ur videos are really very helpful and easy... Just pray for me plz...i have a chemistry exam tomorrow.

[@aligohar927]

I do not know how he keeps explaining and i keep getting it but he keeps doing it and its blowing my mind

[@_Dreamer_9306]

Same

[@ksy.c368]

better explainatios than my teacher .precise and concise

[@blakejones3176]

Thank god for this video. Really. I'd fail all my exams if it wasn't for this guy. Just wish he did history videos too.

[@gkm4225]

Plz help, isn't oxidation the loss of electrons and reduction the gain of ele (OILRIG)?

[@christopherbalfour5014]

Yeah, it’s

[@spareting9153]

Gaurav YT yes

[@HarryDaniel31756]

Yes. Reduction is the gain of electrons to be more negatively charged which is why it is reduction

[@JamifyYT]

Hello sir - your videos are amazing and helpful - what my teacher says in an hour u put into a less than 5 min video! I have a question about the video however - i am stuck at it. At 2:05 i dont understand how oxidation is taking place because u say its losing electrons there is a +3e and i got confused Thanks! :-)

[@Freesciencelessons]

Because the aluminium atom has lost the three electrons to form the aluminium ion (Al3+) and the three electrons (3e-). That is why it is oxidation.

[@JamifyYT]

Ok awesome thanks!

[@unaestrella1876]

Since oxidation is loss of electrons, electrons have a negative charge which means once three of negatively charged electrons leave the aluminium atom, it becomes a Al³+ as it's got more positively charge than before. Hope that makes sense! U need to understand ionic compounds then you can get this

[@unaestrella1876]

Oh never mind, I see where you are at lol

[@thereseenjoyer]

i was doubtful anything would help me but this is actually super useful, thanks so much!

[@cactojuice]

Thanks for this I hate being a higher student who had a crappy teacher in year 10 so we didn't really understand this

[@miashaw1599]

Ellie Neko same, we've had a crappy teacher through yr 11 as well as 10

[@4hm3d.7]

thank god i clicked on this vid, i recently got told by my teacher that i should do the higher exam and was worried for a bit, but after watching a bunch of videos on this channel im living stress free🤣

[@jessicasellers1392]

at 2:00, you said that the aluminium one was oxidation, but isn't it reduction because it has gained the electrons not lost?

[@Freesciencelessons]

The arrow shows what is produced during the reaction. In this case, we produce the aluminium ion (Al3+) and 3 electrons. Because the aluminium atom (on the left of the arrow) has lost three electrons to form the aluminium ion (on the right), this is oxidation.

[@poopoo8512]

I LOVE YOU MR FREESCIENCELESSONES!!!!!!!!!!!!!!!!!!!!!!!!!!

[@Elarnettbriggsxo]

This man honestly made this so much easier. My teachers really made me think that oxidation and reduction and half equations were completely different things.

[@tomwillmer9512]

Hi, I was just wondering how you work out that copper sand zinc have an oxidation state of 2+ at 2:58 ?

[@omarreza5572]

Will you always be given the charge of the compound, for example the ZnSO4 in your example?

[@khattakjarir3399]

sir i have important question you know for the last example, could you write the half equation as Zn - 2e(-) ->>> Zn2(+) and for any other half equation like this

[@Freesciencelessons]

Hi. Yes you can always show oxidation like that or Zn ---> Zn2+ + 2 electrons

[@tahiya450]

The thing with all the sciences is that I can understand a concept but I can't word it in a way the markscheme allows me to get marks. Like I understand the oxidation and reduction part but wording it with the half equations makes me so confused.

[@INKY_627]

Thanks this is really going to help me get with my half equation homework

[@Divine_Echoes]

if the electrons are added on the right hand side then it is oxidation and if its added on the left its a reduction

[@sugarhugs137]

there is no way it was actually this easy istg the teachers in school just make everything so complicated

[@castwt]

You probably won’t reply but pls help my exam is next week. At 2:59 , why is the 2+ charge only applied to zinc on the zinc sulfate and not on the zinc on the left side of the equation.?? And vice versa with the copper charge..

[@Freesciencelessons]

That's because in copper sulfate, the copper is an ion (Cu2+) whereas on its own, copper is an uncharged atom. The same applies to Zinc, which is an ion (Zn2+) in zinc sulfate but uncharged on its own. The key idea is that in this reaction, the uncharged zinc atom donates two electrons to the copper 2+ ion, forming the zinc 2+ ion and an uncharged copper atom.

[@NoThankYous]

@@Freesciencelessons such a hero, replying after 6 years!

[@afreen_12]

i dont understand half equations

[@Mk-hc9jm]

Use the word RedOx Red is reduction and Ox is oxidation Red is on the left hand side and Ox is on the right hand side So if its reduction, all the electrons represented in the equation will be on the left. And if its oxidation the electrons will be repesented in the equation on the right

[@tomshawuk]

This is correct but if you were given a question on this you wouldn't gain all the marks by saying it's just because they're on the left/right side.

[@Mk-hc9jm]

I just said that to help the person understand because it is quite a hard concept to grasp.

[@mayesharahman804]

@@Mk-hc9jm omg this was seriously helpful...did not even realise that. thanks

[@roudhaal-khaldi7765]

@@Mk-hc9jm you literally helped me with my biggest problem in chemistry! Thank you so much I really appreciate it.

[@ryanathwal8819]

On the last bit you told us the ions present but in the exam do we need to find this out ourselves because I don’t understand where you go the 2+ from did you make it up

[@lucasisaac8063]

rob bob Someine else asked the same question and he replied with Everything you need will be given in the exam. They're testing your understanding of the ideas.

[@amiii443]

the video for 2016 is helping me actually

[@johnbob1022]

Hi when will you be doing physics videos on 9-1, I love your videos by the way; they are very helpful and I learn a lot more than I do in lessons ;)

[@Freesciencelessons]

Thanks for the comment. I'll be releasing my first 9-1 Physics videos in around two weeks. I'm just finishing off the first part of Chemistry.

[@kirake2202]

yes! sean donnely is the bomb!

[@seyedhumzasadad8916]

I've been sitting in class dumbfounded I watch this video and everything becomes clear in a matter of minutes

[@Sh-hg8kf]

Gosh this gcse seems so much more concise and better than the trainwreck that's my country's education board

[@PIXELGamerzXvlogs]

I have a question, you know in the video where you said that Cu was Cu2+ in the left side and Zinc was Zn2+ on the left side. Well how did you know that and how would you figure that out in an exam?

[@Freesciencelessons]

Information such as that would have to be given to you in the exam. Transition metals can have multiple ions and you're not expected to learn them. But you are expected to be able to use them.

[@chocolatebrowniegirlll9533]

OILRIG helps. Oxidation Is Loss (of electrons) Reduction Is Gain (of electrons)

[@bobsmith-fq3qr]

Do we have to remember the ionic charge of the atoms?

[@anusreerao4426]

How do we know if an equation is oxidised or reduced when there is a +2e- (- as the superscript) in both the equations?

[@jassvideo4727]

god sent person, thank you very much

[@anjali-dj7nf]

hello do we need to know the charges of everything in the reactivity series? for example o2-

[@Freesciencelessons]

No you don't need to know those. You should learn that group 1 ions are +1, group 2 are +2, group 6 are -2 and group 7 are -1.

[@lolsho]

great video keep the pace mate your doing well

[@johnabrar8096]

thnx a lot. Now I am understanding the ionic half equations easily!

[@Freedom-cr8jz]

I am doing a degree in physics and i had to come back to these videos 3 years later for the chemistry

[@benplays1834]

Sir, do you have to balance the half equations? ie 2O + 2e^- > O2^- With regards to the example you used

[@dem4421]

Now that you have explained.. It's soo easy Anyway thx!!

[@sanadalamat1893]

What is the best way of studying chemistry?

[@Freesciencelessons]

The best way I think is to watch all my videos and then answer the questions in my revision workbooks (which I'm releasing later this year).

[@abdulkadirnasir2621]

Youuuu are the bestt sir!!Appreciate it

[@sophiecaballeropearce5875]

With Cu2+ wouldn't it be oxidation because its a plus meaning it has lost 2 electrons?

[@Dragenyx]

No because it starts off as Cu2+ and GAINS 2 electrons; becoming Cu. It is reduced.

[@OmarFarah-q6f]

escuse me sir for the example 2:58 how would i work out copper ion charge

[@OmarFarah-q6f]

plzz reply as soon as possible

[@Freesciencelessons]

Hi. At GCSE level you cannot work out the charge on a copper ion. That's because copper is a transition metal. Transition metals can have different charges depending on the reaction. In the exam, you will be given any charges that you need.

[@rohanmalik7849]

Hi, I now understand oxidation and reduction but, i need to know what is the oxidising agent and reducing agent. I don't know how to answer this please can you help me. Thanks! these videos are really helping me.

[@Freesciencelessons]

An oxidising agent is a chemical that oxidises something else (ie removes electrons from a different chemical). And a reducing agent is a chemical that reduces something else (ie adds electrons to a different chemical).

[@opheliaxo7250]

it makes sm more sense now

[@A--Hollow]

you're a live saver

[@ahmedzayan8579]

My exams are in less than a month, would appreciate if you release your revision workbook earlier.

[@SachGaming]

this is for the new 9-1 exams lol

[@sayfino5583]

Maybe if you read the time tag of the comment, you'll see it was 8 months before you commented...

[@mollypass6292]

Plea​se could you do a video on writing ionic equations in redox reactions because I really am struggling with understanding it and it would help me so much for my exam next month! :)

[@thatguyinthebackground]

Keep doing things like this and smiling at the end, everyone will love u!!!!😋😋😘

[@XLeilaX]

Does it matter which way you write half equations

[@umaisnaveed5527]

TechTube Vision no

[@izzybratt4787]

could the equation for the oxidation reaction for zinc be written as Zn - 2e- > Zn2+

[@jubileej1629]

I love you so much. It is because of you that i have been able to pass my chemistry. Thank you!

[@sarahrutter4084]

As Zn is a transition metal how did you quickly identify it has to loose TWO electrons?

[@ahmedelamin1499]

Sir is water used in chemical reactions pure

[@yaziz8687]

If oxidisation and reduction has 2 meanings how would you know in the question if they're asking for the electrons or the oxygen one?

[@Freesciencelessons]

They will tell you which one they want.

[@yaziz8687]

Freesciencelessons I see thanks!:)

[@muscat3815]

hello, i really appreciate your videos - they really help me understand science more, however, my school still uses the old spec (not 9-1) and i can't seem to find those videos on your website. is it just me, or have you taken them down??

[@Freesciencelessons]

Hi. The old spec videos are still on KZbin. You need to look at the playlists at the top and you'll find them all. I have taken them down from my website as most people who use it are in the UK and we all use the 9-1 specs now. Let me know if you have any trouble finding them.

[@iashaaurangzeb4248]

The question about zinc and copper sulfate how do u work out the ions present

[@CJ-gj5fr]

Hi I was wondering with group 1 metals going down the group reacting with water. Do they react more vigorously due to the outer electron being lost more easily, due to the decrease in ionisation energy, hence the metal displacing the hydrogen atom happens more quickly leading to more heat to burst out when you mix the alkaline metals with the water?

[@ahmedzayan8579]

Sir can you please briefly tell what would be the difference in the electrolysis of Dilute NaCl and Concentrated NaCl. I'm struggling quite a bit.

[@supbitches9841]

0:48 i'm so confused please help oilrig means if it's oxisidies then it loses the electorns but then its saying somrthing diffrent would be very grateful if you reached out to me

[@Freesciencelessons]

There are two definitions of oxidised. If something is oxidised, then it has lost electrons. However, you can also say that something is oxidised if it reacts with oxygen.

[@supbitches9841]

@@Freesciencelessons thank you very much sir, your videos have been very helpful.

[@anonymousog9608]

How do you know that the ions present for both Cu and Zn are 2+? I understand that they are transition elements, but are they in Group 2?

[@Freesciencelessons]

No, transition elements are not in group 2. In the exam, you would be given the information that you need for transition metal charges.

[@nicolee8292]

In the exam would the ions be present to do the last question?

[@qjaja5547]

what is the purpose of the e- or the 2e-?? if mg forms mg2+ it means it has lost electrons to form an ion, so what is the + 2e-? Coz wouldn't that mean its gained electrons

[@meher845]

Elena Tozowonah I was wondering that too, but I think it the +2e could be the gain of electrons for the other substance? I could be wrong

[@nikesunmola1906]

I am struggling so bad to identify how the equations could possibly represent an atom oxidised or reduced. Am i looking at the 2e- or the Mg2+. The equations does not make sense and it is stressing me out

[@Freesciencelessons]

The fact that the Mg has LOST two electrons (to form Mg2+) means that it is an oxidation reaction. If the electrons are on the right hand side of the arrow, then they have been lost.

[@shanemenezes-qg2zs]

1:35 I thought it was the other way around 🤦🏾‍♂️🤦🏾‍♂️🤦🏾‍♂️🤦🏾‍♂️🤦🏾‍♂️🤦🏾‍♂️🤦🏾‍♂️😅😅😅😅 But thanks for making it clear, thank you and keep making these videos 👍🙂

[@jaimoljohn4319]

I know I'm probably wrong but I'm confused about the last question because Zinc turned into zinc sulfate , so, wouldn't it be reduction instead of oxidisation because it gained electrons and wouldn't copper sulfate to copper be oxidisation because it lost electrons. Please help...

[@Freesciencelessons]

When zinc reacts to form zinc sulfate, the zinc atoms lose two electrons to form Zn2+ ions so that's oxidation (losing electron). The copper ions Cu2+ gain the electrons to form copper atoms, so that's reduction (gaining electrons). Does that help?

[@jaimoljohn4319]

Thank you a lot

[@roshnaqann1941]

Hi sir are ionic equations and half equations the same thing cuz im really confused about this

[@chixo4848]

hello sir is there any difference between the igcse and gcse? because im in igcse and your videos are gcse

[@samanthasharp6271]

yeah igcse is a bit harder. i'm taking igcse as well but the the syllabus are pretty similar (gcse is a bit more simplified)

[@charmingangel7566]

How did you know that CuSO4 was Cu2+ and ZnSO4 was Zn2+ ?

[@kimkeybum404]

I’m a bit confused. How is Mg2+ oxidation? Oxidation and reduction looks the same to me 😓

[@youssefhashimi4901]

This guy deserves a trophy for how many ppl he's helped

[@francescaf7705]

chem exam in like 2 hrs, let’s get it

[@cw8486]

hey shaun, how can we know magnesium is more reactive that iron when they arent in the same group?

[@Freesciencelessons]

They're not in the same group. Magnesium is in group 2 and iron is a transition metal. Magnesium is quite a reactive element. Iron has a fairly low reactivity.

[@Mustafa-mh1ro]

This teacher is just too good

[@anjanaaalex]

how can i learn chemistry efficiently and get an a* in a month for igcse?

[@Freesciencelessons]

I can't promise anyone an A* as that's a difficult thing to achieve. However, I can give you advice that will help you to achieve a good grade. Watch my Chemistry videos but BE CAREFUL because they're NOT written for iGCSE so you'll need to use your textbook to fill in any gaps (keep checking the spec). Then do as many past papers as you can find and look very carefully at any questions that you struggle with. However, a month is not a lot of time so you'll really need to work EXTREMELY hard. Good luck.

[@wanderingfurqu5067]

Anjana Alex So what grades did you get?

[@maximeonyt7819]

what grades?

[@lioncubden]

Hi sir, please if you could answer this question quickly as I have my chemistry mock tomorrow, at 2:50 do they give us the ions present or do we have to find them ourselves?

[@Freesciencelessons]

In a question like that one, they will give you all the information that you need. However, you do need to remember that group 1 metals always lose 1 electron and group 2 metals always lose 2 electrons. Group 7 elements gain 1 electron and group 6 elements gain 2 electrons. Hope that answers your question.

[@lioncubden]

Freesciencelessons OMG YOU RESPONDED THANK YOU YES THAT ANSWERED MY QUESTION I AM YOUR BIGGEST FAN AND IM GOING TO SHOW OFF TO ALL MY FRIENDS THAT YOU RESPONDED THANK YOU SO MUCH SIR YOU MADE MY DAY !!!!

[@Freesciencelessons]

No problem.