Transition Metals - Ligand Substitution Reactions｜AQA A Level Chemistry Revision

This video is intended to be an ultimate guide and revision on EVERY transition metal complex ligand substitution reaction you need to know for the 3.2.5.2 Substitution reactions section of the 3.2.5 Transition metals topic for the AQA A-Level chemistry specification. The aim of this video is to help all of you revise and prepare for your paper 1 and 3 exams.
This video does not include the complex stability (chelate effect), shapes, bond angles, or isomers. You MUST learn this information too
👍 If you want to improve your grades and see more content like this - like, share, and subscribe to the channel! 📈
🔍 In this video, we cover:
00:00 - What you will learn (AQA specification)
02:14 - What are ligands and complexes?
04:55 - Monodentate ligands you need to know
06:43 - Coordination numbers
08:20 - H2O and NH3 substitution equations
18:37 - Cl- substitution equations
19:19 - explaining change in coordination number
20:53 - Cl- substitution equations continued
26:49 - Bidenentate ligands you need to know
29:05 - Bidentate ligand substitution equations
33:33 - Multidentate ligand equation (EDTA4-)
36:03 - Haem iron (II) complex and haemoglobin
37:50 - Practice questions (active recall)
📝 Resources 📖
- AQA specification:
filestore.aqa.org.uk/resource...
- AQA teaching document specifying that you no longer need to know Co2+: filestore.aqa.org.uk/resource...
📖 Huge shoutout to the resources used to make this video:
chemrevise.org
www.chemguide.co.uk/index.htm...
📚 Although this tutorial focuses on AQA, the concepts covered here are also applicable to other exam boards, such as OCR and Edexcel
AQA document specifying that you no longer need to know Co2+: filestore.aqa.org.uk/resource...

[@easymodeexams33]

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[@exultant5728]

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[@easymodeexams33]

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[@pallavisrikanth]

PLEASE MAKE MORE 'EVERYTHING YOU NEED TO KNOW' VIDEOS

[@easymodeexams33]

I found it ironic that at the end of practice question 3 I said "hopefully you guys got that right", and I got it wrong 🤣😭 fml.... please don't do what I did, make sure to add a 3 after (C2O4) in the complex formed [Fe(C2O4)3]4- !!!! I've already rendered this video three times and had issues with the recording so don't have the time or patience to fix it 😂 hopefully all good with u guys! 🙏♥

[@J.246]

It’s okay! Everyone makes mistakes haha, we’re more than grateful for this, SO THANK YOUUU 🙏🙏

[@Xlr8t]

no worries bro

[@Davidkings280]

I love the way you teach, very calm voice and knows what he's doing. This video was way better than what I was expecting. You just earned yourself a subscriber. Thank you.

[@easymodeexams33]

thanks, that means a lot :)

[@SG-kp2ef]

you keep making vids right in time for when I need them..... love u

[@aphrodite._xx]

Legend I was struggling on what to remember from this topic thank you!

[@nichecritter]

Brilliant video, thank you for linking your sources!! :DDD

[@abubakrkhan1705]

This guy is the goat man. Big thank u!

[@easymodeexams33]

haha thanks man, no worries!

[@Alexandra-re1lt]

Your videos are extremely helpful 🙏

[@easymodeexams33]

thanks :)

[@peachtea532]

thank you for this video!!

[@jewelchieng21]

youre a life saver you know

[@nidaasghar5589]

please make more video they are very helpful !!!

[@Masowe.]

wow, how come i didn't get this for so long. Thank you

[@easymodeexams33]

no problem :)

[@Tjolay]

This was exactly the video I needed thank you!!

[@easymodeexams33]

no worries :)

[@aarijkhan8093]

Your actually the goat tysm, im resitting alevel chem this year as I wasnt happy with my grade in Aug 23 and you have been so much help so far! Please close to exam time season more vids would be appreicated!!!

[@easymodeexams33]

sure man no worries. I retook all my year 12 exams and did year 12+13 exams in one year (did previous spec with 2 years of exams) so I've been there lol

[@malaikhudin3960]

i literally love you 😭😭. The way you explain every step is exactly what i needed, ive finally understand transition metals a day before exams after a million videos, i wish i found you earlier. p.s I had to stop halfway through the video to comment this.

[@easymodeexams33]

thanks for taking the time to comment, it means a lot :) I'm glad I was able to help, good luck!

[@asalchegeni4926]

This is God sent thank you so much for putting so much effort into these videos

[@easymodeexams33]

no worries :)

[@nurarahman4753]

You’re an underrated guy. Thank you so much for these videos.

[@easymodeexams33]

Thnx 😊

[@lolaaina2563]

This was such a helpful video! Much better than all the other videos I've watched 😭you explained it so well and in detail of everything we need to know. Thanks so much, your a lifesaver !!!!! 😭🙏❤ Definitely watching all your other video for Chem paper 2, gonna need that for sure 😭

[@easymodeexams33]

Thanks, I'm glad you found it helpful 😁 Good luck!

[@user-px3fm9kn8b]

finally understanding this the day before my exan 😳

[@hannahrafique9537]

thank uu🐐

[@eyeshurrr]

THANK U LIFESAVERRRR

[@abaseennoor7700]

mate your videos are acctually amazing, i just wish I found your videos earlier than the night before my exam 🤣

[@easymodeexams33]

😂 that sucks man,, I hope they helped u out and paper 3 went well :)

[@ashchauhan5214]

Great video 😎

[@easymodeexams33]

thnx! good luck for tomorrow :)

[@DimuthuYapa]

Thank you so much , sir.

[@easymodeexams33]

Happy to help :)

[@samuelo6083]

Thanks you so much.😭😭😭. I actually understand this topic now. I thought I was cooked for the exams

[@easymodeexams33]

You've got this bro 💪 ez

[@imtiazkhanabbasithinker]

Very explanative❤❤❤thnx a lot sir

[@easymodeexams33]

Happy to help :)

[@user-qb9ku1jz9p]

Thank you! It would be great if you went through paper 1 2021 or 2020 before the exam :)

[@easymodeexams33]

I've done some 2020 and 2021 questions already on my channel :) but I won't have enough time to go through them all before the exam, soz :(

[@a79899]

can you do electrodes/electrochemistry please

[@RingsideReels]

Cheers, mate

[@easymodeexams33]

no worries :)

[@batoolbx]

thank you sm

[@easymodeexams33]

no worries :)

[@Life-vf4xx]

Could you please do a video on nmr

[@malihaa3662]

Legend

[@kiranmanoj9627]

are those the only colours you need to learn (besides the vanadium) for transition metals 3.2.5? The chloride ones? 25:07

[@easymodeexams33]

check this resource out :) I used this anyways filestore.aqa.org.uk/resources/chemistry/AQA-7405-REACTIONS-OF-METAL-IONS.PDF

[@JAM-wn5uc]

can you do redox titrations please

[@nicolapopa6906]

Your amazing

[@easymodeexams33]

no you are :)

[@parisasafdari13]

Thanks for this video. I have a question: If a question asks why does Enthalpy change remain zero (for these types of reactions) is it because the same number of bonds were broken and formed for the metal complex?

[@zaynabnoor7975]

im pretty sure thats right ....a question like that came up in one of the past papers I think it was the 2017 paper 1

[@crazyleprichaun860]

can there be an incomplete substitution with bidentate ligands?

[@lauracampbell4498]

2nd time sitting my Chemistry Alevels, wish I saw this video last year

[@lol.1296]

aww what did you get first time around?

[@user-un6bi1yu1p]

for the complex ion formed in 32:50 do you have to add the charge in for the (C2O4) 2- ? in the [ ] ?

[@easymodeexams33]

Nah, charges are accounted for outside the square brackets when its a complex

[@peachtea532]

do we need to know about Cr colours? thanks!

[@easymodeexams33]

I actually spent a lot of time looking into this before the video and it's honestly hard to tell because AQA doesn't explicitly say you don't have to know it, but I am almost certain that you do not. In the 2009-2015 spec, it detailed specifically that you needed to know all of the complex colours, and you needed to know the ligand sub and aqueous ion reactions for Cu, Co, Fe and Cr - but Cr isn't mentioned in the new specification anywhere as far as I can tell. I hope that helps :) old spec if you're interested in difference:www.a-levelchemistry.co.uk/uploads/9/0/4/5/90457821/aqa-2420-w-sp-10.pdf

[@mindurbusiness5507]

Ur videos give me faith I might actually pass 😭🤞

[@easymodeexams33]

I believe in you :) don't give up, not long to go!

[@sadmarcharicheese2041]

You for the ETDA 4 - one? is there a change in coordination number?

[@easymodeexams33]

nah, it goes from 6 coordinate bonds to 6 coordinate bonds. The number of ligands does not matter for coordination number, only the number of coordinate bonds.

[@pranavbhatt8785]

Could you suggest a good way to understand the contact process and those equations I am finding it hard to understand and memorise them

[@easymodeexams33]

the contact process equations specifically?

[@pranavbhatt8785]

Yes

[@user-rj7mq3cd8t]

wait so whats the stuff where you make stuff like [Cu(H2O)2(OH)4]

[@easymodeexams33]

That's reactions of aqueous metal ions, I have a video on that too

[@rubiksworld2170]

Do you have any tips for memorising all the colours?

[@easymodeexams33]

No specific tips tbh, other than using flash cards and blurting, and taking note of what you get incorrect often and why that might be. Hope that helps.

[@rubiksworld2170]

@@easymodeexams33 Thank you I’m doing that right now! It’s hard but I’ll get there 😅

[@easymodeexams33]

@@rubiksworld2170 it is hard, good luck. Maybe pics of the colours as image on Anki/Quizlet along with the written answer might help

[@aa-gn6zn]

Hi thank you for this video but wasn’t co2+ taken off the spec?

[@aa-gn6zn]

Oh sorry I just got up to the part where you said we don’t need to know the colour changes for it but could they still use it in application questions?

[@easymodeexams33]

@@aa-gn6zn the colour changes are off the spec, but not the equations etc. from AQA spec: Exchange of the ligands NH3 and H2O occurs without change of co-ordination number (eg Co2+ and Cu2+). Exchange of the ligand H2O by Cl- can involve a change of co-ordination number (eg Co2+, Cu2+ and Fe3+).

[@danzaduke5822]

i love you

[@easymodeexams33]

haha thanks :) good luck

[@ar-mo7xc]

I wish i skipped school and watched your videos instead

[@mariamkhan9698]

Is this all of transition metals?

[@easymodeexams33]

nah there is quite a bit more, this is only ligand substitution. please check the spec :)

[@Charisse_]

How comes with monodente complexes that have the Cl ligand you only put square brackets around the complex, and not normal brackets around the Cl ligand aswell for example [CuCl4]2- instead of [Cu(Cl)4]2- like it was with [Cu(H2O)6]2+

[@easymodeexams33]

I believe it's because Cl- is an ion, but H2O is a molecule. It would be incorrect if you wrote H2O6, because that looks like 6 oxygen atoms instead of 6 water. Hope that makes sense.