Variable oxidation states chromium chemistry

[@ChrisKriel]

This is no longer on the AQA syllabus 2019

[@eesaakhan6448]

is this for the aqa syllabus, they don't specify in the spec about knowing about chromium, copper and cobalt. They do mention Vanadium though. Thanks for the video !

[@Shazzkid]

If you turn your auto exposure off, on your camera it should stop the constant lightening and darkening of the video

[@AlleryChemistry]

Thanks I will look into it. It's a HD Logitech camera so there should be loads of help out there on the web as to how to do that.

[@sososoawesome1]

Don’t think this is for the new spec, as the aqa chemistry guide only mentions Vanadium

[@shakeelbltee8306]

thankyou very much. you explain everything of the topic and it would be great if you solve a hard past question after explaining the topic so that the question includes all the crucial points of topic.

[@AlleryChemistry]

+Shakeel Ahmed Thanks very much! I have done videos on exam questions. Here is a video that includes transition metals kzbin.info/www/bejne/pYPGe4B9oLl3jZI many more to follow too.

[@mikethomas4694]

@@AlleryChemistryWhat camera do you use to do this video? Can I please have a picture of the setup?

[@mohamediman9629]

you da real mvp 😉

[@AlleryChemistry]

Thanks! If I'm honest I had to do a google search for mvp. Ha!

[@vivianeplekhotkine]

you're a legend thank you!

[@ruqayyahamin6849]

is this in the new spec?

[@sonilzaki]

THANKYOU SO MUCH! Really appreciate it :) are you going to be any on ligand substitution? and also I can't get my head around electrode potential calculations, whether it's feasible or not because there are SO many ways of doing it and it has totally confused me. I really don't want to lose crucial marks in my exam. Thank you once again :)

[@AlleryChemistry]

Sonil Zaki Yes, more transition metal videos to follow. This will have to be next weekend due to work commitments. With regards to feasibility I would look at the anti clockwise rule to help you with this. Thanks!

[@sonilzaki]

A level Chemistry Revision Tutorials by Allery Tutors Thanks, I'll be waiting.

[@Sara-sx1iv]

So helpful :) - please make a video on entropy and Gibbs Free energy if you have the time

[@SadiqunhnabiChoudhury]

So how does the dichromate to chromate equilibrium exist naturally if you have to add OH- for the reaction to occur?

[@rafat3892]

a legend...

[@HewieOG]

When you react "chromium" with oxygen, how do you know whether Cr3+ is to be used or Cr2+ ?

[@lisamilne8621]

life saveeerrrr

[@TruthPrevailsAlways-1]

Hello! The new AQA spec says the Cobalt chemistry is no longer required as it used to. Is this true? Please answer if you know this

[@lucahervada3697]

It is true, yes

[@VipashaPatil10]

Why chromium doesn't exhibit + 1 oxidation state , it contains only 1 electron in 4s orbital ?

[@ramaboy10]

is this needed for aqa? it only talks about vanadium

[@venerablesimpatico2817]

My textbook says Cr2O7 (-2) + H2O 2CrO4(-2) + 2H+ Why is it H2O and not OH-?

[@AlleryChemistry]

Cr2O72- has to be dissolved in solution hence the reason why we have H2O

[@mals4343]

I thought if u add acid the equilibrium should shift to the right?

[@tgdhsuk3589]

WTF THEY NEVER MENTIONED THIS AT SCOOL