AQA A-Level Chemistry - Alkenes (inc. E-Z Isomerism & CIP priority)

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Bless you. As in for your sneeze and your soul for saving so many of our grades

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just read this as he sneezed

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I remember it as (Z)ame and opposti(E)

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@@mattharris1930 ze zameeeeee zideeeeeeee

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Legend

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eposite

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Thanks

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this saved my life! my chemistry teacher is Scottish - none of us can understand her, and she rushes through everything and hates us asking questions. So this is so much nicer; as you explain everything without unneeded information.

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really helpful. you made A level chemistry so simple to do

[@MrERintoul]

+KELVIN Opoku Forkuo Excellent :)

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very helpful, definitely need more teachers to break down topics like you. Awesome Job!!!

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made 7 years ago but this stuff is still my favourite!! so helpful!!

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Thank you so much for uploading these videos I didn't understand anything in chemistry until I started watching your videos, you are so good at making concepts in chemistry that were difficult for me to understand into something very easy. I really wish you were my class teacher unfortunately I a stuck with a teacher who was an Oxford graduate ,who can't seem to let those Oxford glory days go... like if you have a teacher similar to this : someone who just likes knowing they are smarter than the whole class and constantly making sarcastic comments and when the whole 2 chemistry classes do terribly multiple times not being able to realise she is the problem.

[@rkbegg6785]

Hi, I spotted a mistake when talking about the ez higher priority elements, it's the atomic number you need to take into consideration not the mass number of the element.

[@peterarcher4813]

Thank you so much Eliot, this is so helpful. I try to understand it in the CGP guide but sometimes it sinks in so much easier when you're shown examples. Absolutely massive help. I hope to see more Chemistry videos 😊

[@annice-4609]

These videos are amazing! You make everything seem quite simple and relaxed, and put it in terms I can remember!! Thank you!!

[@TENIEKEN]

you are creating future leaders! future chemistry einstiens dont stop!!! my gen well cure ebola in no time!

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I don't know why I laughed so much at that comment

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But but you can even spell Einstein.

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Suha and you can’t even spell can’t

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​@@mabelsyrup588 and you can't even punctuate.

[@AdoptedPoo]

@@keke3897 You started your sentence with a connective, for shame!

[@amenamumu3753]

Your videos are really helpful and I understand each topic 10x better. Could you please make a video on structural isomerism especially explaining the chain, positional and functional group isomers?

[@Emzy23541]

Thank you! you explain things so well! ^.^

[@MrERintoul]

+Emma:) That's very good to hear :) thank you.

[@jeeva1996]

Please do a video for transition metals, it's soo confusing!! Thank you in advance, you're a great teacher :) :)

[@MrERintoul]

+jeeva1996 I'm teaching that to my class at the minute and it's one that I certainly aim to get done!

[@MrERintoul]

+jeeva1996 And thank you for those lovely words :)

[@jeeva1996]

E Rintoul No worries, I only spoke the truth :)

[@siimashalomprecious6595]

Thanks, l have clearly understood E-Z. And for the sneeze, m praying for yah

[@gabbyhoult3637]

at 8:53, why do you write one ethyl group as H3C and one as CH3? Why not just write both out as CH3?

[@ahaf4654]

Because then it makes it look like the hydrogen is attached to the carbon instead, which you could lose marks for in the exam x

[@TheNathanael315]

Hi, i love your channel and you helped me get an A in chemistry AS, this year, i was just wondering when you would finish the Chem 4 and 5 units now im in A2, i appreciate that your busy, but i would really like it if you uploaded the remaining videos as they are such a great help.

[@MrERintoul]

+Black Marvel I will aim to get as many of them done as I can, but it's just difficult with time! But watch this space!

[@Ruhit_99]

17:05 - Is it determined by the highest atomic number or highest mass number? Chemguide says Atomic number but will looking at highest mass number be OK also?

[@fstnukezz893]

Just go with atomic number, stay safe bro :D

[@Ruhit_99]

+FST NUKEZZ thanks mann 😊😊👏

[@abbasarshad380]

Beautiful video..just beautiful sir..THANK YOU 👌🏻👌🏻😁😁

[@ryanpr1351]

At 17:07 the top carbon is attached to three H atoms (total Ar=3) and the bottom carbon is attached to two H and one carbon (total Ar=14) is that why the bottom has the highest priority?

[@Gov123__]

16:40 ish - how come the C=C bond was split horizontally before and now it's split vertically? It's the horizontal E-Z and vertical CIP or something?

[@SteveTheCheeseInc]

+govinda sharma no he just drew it differently

[@MrERintoul]

+govinda sharma What the other guy said. The actual arrangement doesn't matter for the exam.

[@livontheedge101]

4:44 - The “ough, noice” got me 💀 😂

[@nabeehakhan555]

isnt it atomic number for cip rather than mr ?

[@nosir1479]

22:50 So the *group* with the highest Mr?

[@486demonbanana]

Thank you very much, this video was incredibly helpful! you have managed to make this really simple to understand. I'm curious about your two dislikes though, i guess its just some people doing it deliberately. We'll never understand those people on this site. Thanks again! =)

[@angelf722]

I'm late but for the last question, isn't there two of the same groups?? CIP system isn't needed?? So off the two carbons on the double bond, one has hydrogen and CH3, the other has CH3 and C2H5. Each has two different groups, so this is Z isomer, as the same CH3 groups are on the same side..? So the correct answer would be if CH3 was in the opposite side?

[@ImranAhmed-yj5ck]

why is the line going down the middle vertically at 16.25 but it was horizontally before.

[@daaragoodluck]

I've been trying to learn this for so longggg! Thank you!

[@d18stars89]

please please please could you do a video on equilibria?:D that would be amazing!!! thank you for all of your videos! they are such a great help!

[@AKBeats1]

in quarentine studying for my resit because yr 12 was f'd up

[@naeemlakha4321]

Thanks mate , making chemistry so simple!!

[@oliverbradley816]

Please can you make a video about optical isomerism in the old A2 chemistry spec?

[@MrERintoul]

+Oliver Bradley Yep, it's one that I'll do in the future.

[@emmacheetham2403]

why does But-2-ene have e-z isomerism because i thought that the CH3 was part of the chain and so not classed as a separate group? I have my exam tomorrow and I'm really confused about isomerism!!

[@JazzyBee153]

sorry if this is too late. When you're drawing E/Z isomers you just draw the double bond out fully. Then the structural formula for either side of the double bond. So if the CH3s are both on the top/on the bottom its Z, if theyre diagonal to each other its E :)

[@MrERintoul]

What Jasmine said! The alkyl groups ARE part of the chain and they are named as such. However, it is their attachment to the C=C that governs E or Z isomerism.

[@JazzyBee153]

+E Rintoul btw I literally found you today and you have saved me, thank you so much!

[@emmacheetham2403]

thankyou so much both! so glad both exams are finished!

[@jbman890]

what about the new a2 spec stuff?are you gonna do videos on them?

[@Carlos-vd3ni]

What is the two substituents with the highest atomic number were on the same carbon? Do you still find the group on each carbon with the highest atomic number or would it not be a stereoisomerism.

[@tanzeelahmadhashmi6209]

thanks for the video I really understand it now but I've got a question; Can you have E-Z isomerism in pentene when there is a methyl group on one side and 2 methyl groups on the other?

[@MrERintoul]

+Tanzeel Ahmed Hashmi I'm not sure that what you have described would be pentene... Do you mean methylbutene? Either way, in a situation where you have one methyl on one side (with a hydrogen atom also attached to the carbon of the double bond) and then two methyl groups attached to the other carbon atom, you cannot have E-Z isomerism. No matter how you switch the groups around, the molecule will always be the same. You get me?

[@tanzeelahmadhashmi6209]

+E Rintoul oh yea I'm sorry I meant methylebutene and thank you so much I got it and understand it now! :-)

[@mubss9345]

why do you separate the isomers horizontally then vertically that is the only thing that confused me

[@MrERintoul]

+Mubs S You need to look at priority on each side of the molecule, hence me saying to think of them as left and right. BUT, the actual EZ notation comes from looking at where the highest priorities lie, hence me talking about looking at it horizontally!

[@MrERintoul]

+Mubs S You need to look at priority on each side of the molecule, hence me saying to think of them as left and right. BUT, the actual EZ notation comes from looking at where the highest priorities lie, hence me talking about looking at it horizontally!

[@maishahussain6244]

Do you have a video on structural isomerism?

[@MrERintoul]

+Maisha Hussain Not yet. It is coming!

[@pradeepdc4170]

nicee...........it will surely enhance knowledge******

[@MrERintoul]

+Pradeep Dc Fingers crossed!

[@JimJam-ju6vn]

Thank you so much! Is it okay to watch,despite the fact i do OCR?

[@Mxmx-zw9tt]

hi, are you going to be uploading any videos for Unit 4 and 5 from the old spec

[@MrERintoul]

+My112 Y Yeah, definitely. All my kids are still on the old A2 so I want them to have the videos. Plus, they are almost all going to remain when the new spec comes into play for the full A-Level!

[@ryanpr1351]

Thank you so much! Do you have any videos on structural isomerism?

[@lnfernalGamingYT]

My chemistry exam is tomorrow thank you for this!! And by the way now we have to do chemistry exams for Btec as well which is really annoying

[@haninshah3303]

i dont understand the last question because it says to draw an E isomer but hasnt he drawn a Z isomer since the same groups are on the same side (CH3). someone please explain im confused??

[@ahaf4654]

No, because the c2h5 takes priority for that side

[@deepamystery]

have you done any videos on Optical Isomerism A2 material?

[@NathaliaCampos]

do you have any videos on alkanes? I use all your videos for revision and they are very useful thank you so much it makes a high difference !

[@MrERintoul]

+Nathalia Campos I think so... Have a look in the playlists.

[@yoiki2897]

Eric, can you reply me with a place for purely organic chemistry past paper questions if you know of any? Had a mock today - Got 34/78.... Been watching your videos and I just cannot believe the difficulty of my AS-Level test today. The polymer section, the mechanisms of Alcohols as well... Even simple parts like naming compounds but the problem was that, they were in the format of say, CH3CH2(CH3)2CCH???... etc which confused me

[@STICKY_]

Thank you, I really find the questions helpful.

[@pierrekostanteen4685]

Shouldn't you be considering the atomic number not the atomic mass when assigning C.I.P priority ? Although it doesn't make a difference when working out the form of isomerism as long as your consistent but when attempting written answers you shouldn't mention relative atomic mass you should mention assigning property via atomic number.

[@nilofarsoltani390]

My exam is tomorrow but I have an urgent question - with E/Z isomers, will they have the same repeating unit in a polymer? Or the same polymer? Thanks for the videos by the way! Lifesaver

[@linkoln_sosias]

+E Rontoul so have you covered the new spec for this years 1st year a level students? and these videos are great for first time understandings 👍 good work

[@linkoln_sosias]

i just started chem alevels and have a teacher who is exceptionally bad at teaching. (been taught by her since y7 now. hasnt got any better) its taken my teacher 2 lessons to teach less than what you taught me in a 30min video thanks gonna show my class ur videos

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your videos are really good. I wanted to ask how you actually write that stuff and what screen cast ( if you use on) you use and how you get to write so clearly. try specifiy the detail pls?. thnk you

[@MrERintoul]

+Saif ahmed I use a graphics tablet to write and I record everything using Camtasia. It really is amazing software!

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ah you wonder this video is great! thanks, helped loads! :)

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thankyou, you're teaching is amazing

[@NirajC72]

what if some1 wants to retake chem1,2,4,5 exams in 2016 will they be able to or not?

[@MrERintoul]

+NirajC72 This is a cracking question. First off, units 4 and 5 will be there, as the June 2016 series will be the last so that's not an issue. But, there is a potential problem with resitting the AS units as by that point, there will be a new specification. I think that AQA will make another paper each for Units 1 and 2 for those who wish to resit...

[@scaleofc1966]

E comes from Entgegen in German which means opposite, Z comes from Zusammen which means together.

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Your channel helps a lot. Thanks

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can i use this for the new edexel spec,i believe they are similar

[@MrERintoul]

+kingchris5889 There will be similarities.

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God bless you sir...thankyouuu

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Very helpful, thanks!

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Such a legend man I love you

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hi, soooooo I take chemistry in AS levels and I took it in IG ,but I got a C in IG , ive always faced problems with chemistry through out the years , do you know what I can do about it or anything I should do to get a better grade before my AS exams reach, I did my pre mocks and mocks and got U and E as my grades , it would be really amazing if any one can help me with this problem ASAP

[@watchdatclip496]

I don't know whether this would a much of help but, just do practice papers, like a lot. Check for the mistakes u do again and again and check online resources. Even while watching these videos, write a summary in a way that u would be able to revise later. Plus, good luck!

[@louybarafi4377]

sounds great thank you so muchhh

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Yay glad it helped! My AS starts on the 11th as well.

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guys helpful tip to rember just know that e is same as enemies and enemies always fight on the opposite side of the battle field

[@JoeJoe7426]

Thanks

[@mclaren8612]

atomic number or relative atomic mass

[@glorydays3776]

haha The sneeze of the legend😂

[@michaelc6294]

This is helpful to an extent

[@MrERintoul]

Seth Crockett It's a shame it doesn't get past the extent. Any feedback?

[@michaelc6294]

E Rintoul your videos are good and I only said to an extent because I’m still not too sure about the pi bonds which I was taught today

[@MrERintoul]

As far as I'm aware, pi bonds aren't officially in the specification. Have a look at this page for a little more help: www.chemguide.co.uk/atoms/bonding/doublebonds.html

[@michaelc6294]

E Rintoul ok thanks

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z-zame/same E- eppiste/opposite :)

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Herro? Do you have a pay-pal page or something? u honestly deserve money for this

[@MrERintoul]

You really don't need to pay me. However, if you're absolutely desperate to, there is a link on my channel homepage

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Bless you

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ur like the messi at teaching chemistry.

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Youre amazing

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There is a god...his name is E Rintoul, thank you so much!

[@crystalbrown2255]

Thank you!

[@YashVerma_twistedsoul]

I think the only think missing was Alkene + KMnO4 (cold/dilute--> ketone, hot/conc--> aldhehyde--> carboxylic acid).. please add that if you can, would help a lot of us

[@MrERintoul]

+Yash Verma As far as I am aware, this isn't something that is required for the AQA spec...?

[@origamarosexx]

Z isomer is when they are on ze same side. Just a little way to remember it.

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bloody genius

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savior

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Just like Shisui

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The German terms are correct!

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Cheers.

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This video has a very low volume issue. One can't hear what the teacher is actually saying.

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why is your handwriting so spiky? are you really angry or something?

[@MrERintoul]

+Lorraine Cameroon Yes.

[@ryou6453]

The goat

[@fstnukezz893]

I remember e as enemy and z for other

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'zis in the same' 'e is the other'

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way to remember if e/z - z is on cis zame zide (German accent )

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