Timestamps (for revising sub-topics): GENERAL PROPERTIES OF TRANSITION METALS (2.5.1) 2:50 = intro to d-block elements 3:34 = electron configuration of d block + defining transition elements 14:15 = general properties of transition elements 19:10 = introduction to complex ions ** LIGAND SUBSTITUTION REACTIONS (2.5.2) 21:18 = types of ligands 1:00:57 = ligand substitution reactions: small, neutral ligands (NH3) 1:03:12 = ligand substitution reactions: larger, charged ligands (Cl-) 1:04:44 = relative strength of ligands + the chelate effect 31:48 = haemoglobin ** SHAPES OF COMPLEX IONS (2.5.3) 23:17 = shapes of complex ions 39:23 = stereoisomerism in complex ions ** COLOURED IONS (2.5.4) 43:41 = d-orbital splitting 47:00 = ∆E=hν 48:14 = relating frequency absorbed to colour 51:30 = factors affecting ΔE and colour 54:04 = colourimetry 16:52 = colours of different oxidation states (to learn) ** VARIABLE OXIDATION STATES (2.5.5) 29:30 = calculating oxidation states of metals in complex ions 1:10:48 = vanadium chemistry: oxidation states 1:12:19 = vanadium chemistry: REDOX reactions 1:14:40 = redox potentials 1:19:39 = Tollens’ reagent 1:21:47 = redox titrations 1:26:00 = example of redox titration with Fe2+ ions and KMnO4 ** CATALYSTS (2.5.6) 1:29:18 = types of catalyst (homogeneous/heterogeneous) 1:31:12 = heterogeneous catalysis - e.g. the contact process 1:34:38 = catalyst poisoning 1:37:09 = homogeneous catalysis - energy profiles (+ example) 1:41:53 = autocatalysis

@Avo12349

3 жыл бұрын

Omg thank you,

@hasili4413

3 жыл бұрын

god blesss youuuu

@rohitmakhloga8772

3 жыл бұрын

legend

@user-ui5ew

2 жыл бұрын

Thank you sooo much

@jbenson9942

2 жыл бұрын

An absolute life saver!!🙌

I can't believe these are free, thank you so much!

@AlleryChemistry

3 жыл бұрын

No problem! Pleased you found them useful 👍

@shaai4227

Жыл бұрын

@@AlleryChemistry Hi sir dow wee need to know the colours states at 1:03:07 and 1:04:23 ?

@assassin-2020

Жыл бұрын

​@Shaai you only have to be able to describe and explain the test tube reactions for Cu^2+, Fe^2+, Fe^3+, and Al^3+ This includes colours + observations Edit: have a look at the specification for full details

HOW MANY OF YOU HAVE REALISED THAT YOU ARE LATE AFTER KNOWING THE AMOUNT OF CONTENT YOU HAVE TO MEMORISE? 😭

@stellag9593

Ай бұрын

Starting today for Monday 👍

@njsmp1824

Ай бұрын

i'm cooked

@MK-sh7ol

Ай бұрын

@@stellag9593 me too 😢

@dionemuparadzi4223

Ай бұрын

@@njsmp1824 its so over

@koshikrubamoorthy7720

Ай бұрын

@@njsmp1824yh I’m done

This video saved me I can't lie. This topic is one of the hardest, personally, and this video makes it so simple. Thank you so much.

@moonlightmando7163

7 ай бұрын

I agree with you. Its the hardest one by far in my opinion.

This video is so great, I appreciate the references to organic chemistry, it really helps connect the related concepts!

Best human on earth this man is.

@Emzy17

Ай бұрын

Best Chemistry teacher on youtube u mean

last minute gang wya ??? gonna cry fr

@eems4565

Жыл бұрын

HERE i just pulled an all nighter nd i still dont know half the shit 😭😭😭😭😭😭😭😭

@adailyfact

5 ай бұрын

What grade did you get

@javhus100k3

4 ай бұрын

what grade did you get @@eems4565

@neldino1251

3 ай бұрын

@@eems4565 what did you get in the end

Thank you so so much! This makes sense to me! Having not being in education for over 8 years this is so helpful and getting me back in to the swing of it

@AlleryChemistry

Жыл бұрын

You're very welcome. Pleased they are helping to get yourself back up to speed. 😀

How do you finish a 2 hour video in 20 minutes?

This video is fantastic! i have recommended it to my friends !!! Perfectly match with our AQA syllabus

@wtina3672

3 жыл бұрын

Thank you sooo much sir !!!

Thank you SO much for these videos. I honestly do not know what I would do without them. I am self-teaching whilst working full-time so these videos really are saving me! Thank you again.

@AlleryChemistry

2 жыл бұрын

You're very welcome!

Honestly this has helped me so much, was picnicking about how to revise properly and gather info for my revision, and your videos are the perfect tool for this, thank you so much for all of your videos, they really helped me out! 😁

@AlleryChemistry

2 жыл бұрын

You're welcome!

1 day before exam, finally finish this shxt. this video saves my life

@Rahhma

Жыл бұрын

i feel you lool. Learning this topic for the first time the day before, did not realise how much you need to memorise fml

@adailyfact

5 ай бұрын

What did you get?

@adailyfact

5 ай бұрын

@@Rahhma What grade did you get?

@ella_mcgov2013

Ай бұрын

Same boat one year later

Thankyou so much sir. Your videos are concise and very informative and the fact that you are actually enthused about the subjects (Contact process and autocatalysis...😀) makes them so much more interesting to watch!

@AlleryChemistry

2 жыл бұрын

Heh! I'm easily excited!

POV: The night before the real exam be like:

@Naomi.c773

Жыл бұрын

What did u get

@lL-ci6kw

Жыл бұрын

What did you get

@zn2319

Жыл бұрын

Me Rn!!

@c00ldude94

Жыл бұрын

Ermm

@adailyfact

5 ай бұрын

What did you get?

Amazing video but quick error, your ethane dioate has a double C=C bond where it should be a single C-C bond

This is amazing! Thank you!!

u have just clutched up and saved my alevel

Too well explained 💕💕. Thank you!

@AlleryChemistry

Жыл бұрын

You're very welcome! 😀

These are so helpful really appreciated

@AlleryChemistry

3 жыл бұрын

Glad you like them!

Thank you for this video!

@AlleryChemistry

4 жыл бұрын

Glad it was helpful!

will we be given the delta E equation in the exam or do we have to memorise it?

this was amazing thank you!

@AlleryChemistry

3 жыл бұрын

You're so welcome!

Also, how do you know at 1:27:00 that Fe2+ is going to be the reducing agent and how do we know that Fe3+ is the ion of the Fe element that is going to form? Is that just something you have to learn or is that a part of just looking at the reaction and seeing what it's reacting with?

@khash48

3 жыл бұрын

Fe 2+ is a reducing agent, therefore it will get oxidised (loses electron) so it will go from a 2+ to a 3+ charge

is there a mistake at 22 mins 58 seconds. the ethanedioate ion seems to have formed 5 bonds

33:00 Those 4 Nitrogens come from a tetradentate ligand called porphyrin. If you say "haem" - that's the whole complex, not the ligand. As usual, your videos are super-useful! Perfect for a final cram for a topic test :)

@antonia5565

3 жыл бұрын

Thanks!

@lexoticstudios5669

Жыл бұрын

almost like it doesn't make a single difference for the exam!

Thank you, genuinely thank you so much, I'm so tired, thank yoy

@AlleryChemistry

Ай бұрын

You're so welcome!

I love you Mr. Harris

Plugged me nicely

YOU'RE THE BEST

physics student must be feeling like a boss in this chapter

@ahmedel-banhawy3169

Жыл бұрын

Why

@bhavyaatibrewal5365

Жыл бұрын

@@ahmedel-banhawy3169 we do E = hf in physics

Hi sir, thank you for making these videos. Is it a requirement that we memorise the colours of all the transition ions?

@zek520

2 жыл бұрын

Yes it could be beneficial knowing them

the main character in all of our stories

@behappy1452

3 жыл бұрын

ok...

Damn, I live in the garage tho :(

hello, are we supposed to learn all the oxidation states and colours? thanks

@AlleryChemistry

3 жыл бұрын

Yes you need to be familiar with them

quick question, in the redox titration questions in the exam, would we be given the equation for the reaction or o we have to work it out ourselves? Brilliant video, thank you so much for the revision !

@MM-user2

Жыл бұрын

Sometimes they give it, sometimes they don’t. So it’s best to learn it

22:59 Multidentate ligands shouldnt we define them as having more than 2 coordinate bonds so they are not mixed up with bidentate ligands?

@winniethepooh8766

Жыл бұрын

bidentate ligands are multidentate ligands.

Do you need to know all the colours eith thr metals

At 1:22:50 you say that we're looking for the concentration of the reducing agent Fe2+, but then in the blue box you say we're looking for the concentration of the MnO4-? So which concentration are we looking for and were do we put that solution, and which one of the two is the reducing agent? (edit: think you just meant to switch around the MnO4- in the blue box and the Fe2+ so that it says "we look at finding the conc. of Fe2+ by titrating against an oxidising agent like MnO4-" ?)

@ruthie1562

3 жыл бұрын

I’m confused about this too!! I think we are finding out how much oxidising agent is needed

1:13:33 im confused about the equation to reduce vo2+, what acid is used, how come its 2h2o, and not just h2o and 2h+ on the left? please answer

@xjn0177

2 ай бұрын

4 oxygens on the left and 4 oxygens on the right, its 2H20 to balance it out

At 1:29:05 , I was confused as to where the 5 in the Fe2+ came from??

@amyclabon4869

3 жыл бұрын

You have to multiply it up to balance out the electrons

From what minute does variable oxidation states start. Quick replies are appreciated please. Many thanks

@Avo12349

3 жыл бұрын

29:30

Hi Sir, when writing the complex ion down, there are times where you put the transition metal in square brackets and other times where you do not. How do you know when to put the TM in square brackets and when to leave it outside?

@cy5aAaAaA

2 жыл бұрын

I'm pretty sure it has to be in brackets when the whole complex (metal+it's ligands) still have an overall charge that is not 0 so it's still a solution (aqueous). When the complex has a charge of 0 it's now a solid so you write it without brackets.

@ik5377

2 жыл бұрын

@@cy5aAaAaA 26:32 if what you're saying is the case, shouldn't the complex on the left have cobalt in brackets (since water is a neutral ligand)?

@nasarafarah8966

2 жыл бұрын

only put square brackets when the ion has an overall charge

how are you supposed to remember all of these chemical equations is there some sort of logic behind it where u can work out the products or is just something you have to memorise for example the variable oxidation state reaction for vanadium

Great video- are we expected to memorise any equations for the catalysis section of the topic eg Contact process, Manganate autocatalysis, or the Iodide peroxodisulphate one ?

@chunkyboimadu

Ай бұрын

everything 😔

@unimous

Ай бұрын

Yes

at 16:44, how come titanium isn’t in the table? Is there a chemical reason for this? Thank you :)

@AlleryChemistry

4 жыл бұрын

I assume you are referring to the colours.... If so then it's because you don't need to know about it for AQA.

@naomisimmons6512

4 жыл бұрын

Allery Chemistry okay great thanks so much!

keep going!

Thanks

Lads 30 minutes until paper 1 let’s gooo

at 1:27:02 how do you know how to balance the equation like that

@krishthanki7777

2 жыл бұрын

trust me fam

Legend

the square brackets are in the wrong place in octahedral complex shapes section (still good video though)

nice one mate

@AlleryChemistry

Жыл бұрын

Thanks 👍

at 22:51 I think for ethanedioate there isnt supposed to be a double bond between the carbons ? Checking from the aqa textbook :)

@winniethepooh8766

Жыл бұрын

youre right

The goat

Hi Sir, thank you so much for the videos, they're so incredibly helpful. I just have a question about triangleE at about 46 minutes in: In the formula, triangleE represents the change in energy when light is absorbed right (I'm assuming, because data regarding light absorption is used)? But on the previous slide, triangleE represented the energy gap when ligands join. Are they the same thing (in which case I'm very confused) or does triangleE just represent two different things? If it's the latter, how do I differentiate between them? Please advise. Thanks again! Hania :)

@danielwalsh.3835

3 жыл бұрын

The energy gap is equivalent for both. If a ligand joins, the d subshell will split into two energy levels; I.e they have a difference in energy. The light energy required to move a ground state electron to the excited state is the same as the energy gap. By the way, for future reference, the triangle sign is delta, and just means a change in. Thanks, Dan.

The structure of Ethanedioate shouldn't have a double bond. 22:27

@hannahmoomba5078

Жыл бұрын

none at all?

@jafwonta

Жыл бұрын

@@hannahmoomba5078 c=c should be c-c. thats it

Do we need to know about haemoglobin for this topic?

@seray6942

Жыл бұрын

never seen a question on it, could come up tho

Its three days before paper 1 am i cooked?

@shush6798

Ай бұрын

just started today im finished

@ethanl829

Ай бұрын

im here the night before 🙃

@Mmusa409

Ай бұрын

Nope

@lumosv1014

Ай бұрын

Nah g still better than me

doesnt haemoglobin bind to co2 instead of water?

@mr.r2207

3 ай бұрын

Guys I just realised co2 binds to another part of haemoglobin which changes its tertiary structure to reduce affinity for o2, but you don’t need to know this for chem

my goat

do we need to know the colours for all the transition metals??

@assassin-2020

Жыл бұрын

Only conplexes of Cu^2+, Fe^2+, Fe^3+, and Al^3+ Edit: you need to know the colours of the vanadium ions and compounds too iirc Definitely check the spec for full details tho

anyone with an acronym for all these colours 19:15 ?

the morning right before the real exam...

i love you

thanks for the vedio,i purple youuuuuuuuuuuuuuuuu

@AlleryChemistry

3 жыл бұрын

No problem 😊

Do we need to know about Cobalt within transition metals for AQA?

@Prashant-pm7iz

2 жыл бұрын

no you don't need to know about cobalt chemistry. if you're still in doubt check the spec

@user-qb6ep4st1i

2 жыл бұрын

@@Prashant-pm7iz how about chromium?

@BotanTechHelp

2 жыл бұрын

@@Prashant-pm7iz Thanks a lot Prashant. Would you mind sending me the link to find the spec? I just want to be sure i'm looking at the correct thing. Thanks a lot

@vishnumistry9098

2 жыл бұрын

@@BotanTechHelp Section 3.2.5.2: Substitution reactions Substitution reactions involving Cobalt (II) were previously required knowledge under the old A-level Chemistry specification (2420). These reactions and the colours of the solutions and products are no longer required knowledge for the current A-level Chemistry specification (7405) - This was taken from an AQA sheet titled, Reactions of metal ions in aqueous solution

Hi i would like to confirm at 43:28 if it's actually meant to be the 2 same ligands opposite to each other is a trans isomer, not 2 different ligands.Thank you.

@lol.1296

2 ай бұрын

confused by that too

@lol.1296

Ай бұрын

ive already forgotten all I learnt so back and confused by that again😃

Thanks sir for good work done

@AlleryChemistry

3 жыл бұрын

Most welcome

gl yall..

53:19

Great vid but water is not replaced with oxygen. It’s gas exchange, it’s CO2 that is replaced

@SJ_1970

2 жыл бұрын

Actually he is correct. The AQA chemistry textbook says the same. The oxygen molecule replaces / substitutes the water ligand on the haemoglobin to from oxyhaemoglobin. When the oxygen reaches a place where it is needed, a water molecule replaces it and the process starts again. It's true that CO2 is lost in gas exchange, but this is specifically talking about the haemoglobin. CO2 doesn't bind to haemoglobin at any point. Hope that helps 😊

the plug

52:39

Guys are we expected to know the colours at 1:04:20?

@MK-sh7ol

Ай бұрын

I thought we only needed to know the colours for the metal aqua ions

@barnabasfuto7391

Ай бұрын

Yes😢

bookmark 34:00

anyone else cramming !!!!!

Kinda confused on the colour part So when the light is absorbed the electrons excite then when they de-excite they release frequencies giving the substance colour. But then u also said that the light energy that is not absorbed is transmitted and gives colour So which one gives the colour? Thanks

@seray6942

Жыл бұрын

all you need to know is that: the ion absorbs light energy/visible light the light that is reflected is the colour of the ion

surely we don''t need to know cobalt or chromium colours and ligand substitution reactions ahh

@Zen_Zen_Zense

2 жыл бұрын

nahhh only the V ones

@MA-yu2ss

Жыл бұрын

@@Zen_Zen_Zense do we need to know about haemoglobin for this topic?

@lol.1296

2 ай бұрын

@@MA-yu2ss late but yes its on the spec

2.5.1 done 2.5.2 done 2.5.3 next

transition metals and aqueous ions are like the worst chem topics ;-;

ah im screwed

anyone here the day before...