AQA A2 Chemistry - Chromium Chemistry

This video runs through chromium and the various ions and complexes that it forms.

[mahir_labib]

I’ve been studying AS and A2 chemistry online for two years now. Haven’t seen as useful video on a particular topic as this video. Great work!

[davidmohan]

You are a legend. Will you finish all of chem 5 before the exam??

[cherrycake]

You are an absolute legend!!! Honest! I never understood before why adding alkali shifts the chromate(VI), dichromate(VI) equilibrium to the left but now I do! It makes so much sense!! Thank you for this video, it was an awesome refresher without me having to sit down and go through my flash cards lol

[ImranKhan-wdgp]

Was actually revising for biology but as soon as I came across your video I put that aside and watched this! Wish you were my teacher. You've helped so many students, thanks ever so much Sir!

[whitneylodovica]

Please do more Chem 5 videos! you're videos saved me in AS

[saunyboy]

Even if i wasn't doing chemistry i would watch your videos, you are brilliant

[mohsennoureddine]

Hahaaa yes!!!! Thank you awesome guy behind screen. If you ever come to my ends I'll be like wagwaaaan!!😆😂😂👌👍✌

[HDHCZ]

Will you do more Chem 5 videos before this year's examinations? You're a lifesaver! I'm left school last year but I am retaking the exam so you are my teacher!

[itishassam]

Your videos are great man, thanks alot! The Chem 4 and 5 papers are on the 10th and 15th. Would you be able to do as many Chem 4/5 videos as possible before those dates please? Your videos are my main source of revision cause they're really great. Thanks again.

[Farazj]

Thank you very much for this. btw I was wondering what the changes to the spec were for 2016 exams. were there any major changes?

[rojafx]

If only my chemistry teacher was as cool as you...

[MrNarpYarp]

Just a question about the reaction with Na2Co3 at 26:00. I was checking the balancing of the hydrogens, I count 12 on the left and 15 on the right. Am i missing something obvious here? :)

[aleenakhan]

Could you make a quick list of all the major reactions and catalysts needed, and the results of the different tests. ☺

[emily_young]

At 7:33, is it meant to be +3Zn on the left hand side? Very helpful video though, thank you!

[leeho]

What does H+ is in this reaction, the one that reacts with chromate ion to produce dichromate ion in the equilibrium equation?
Thank you so much for your help

[kiransteward]

At 20:30, you say the OH- reaction is a ligand substitution reaction. How can you distinguish between base reactions and ligand sub reactions when they give the exact same products ?

[Saif]

Great video. There is just one thing that has confused me, @17.54 after multiplying the left and right sides of the equation by 3 and 2 respectively, why did you readd the 2OH- ? Thanks in advance

[hanaabdirahman]

Can not thank you enough man! Hopefully some more videos?

[icegirl]

THANK YOU SO MUCH :)
FOREVER GREATFUL!

[anooprao]

Does it matter which way round you put the H2O and the OH and the NH3 ligands when writing out complexes?
Thanks!