Wouldn't the transition metal ion be surrounded by Aqua Ligands forming a complex ion which then undergoes ligand substitution to form the precipitate?
no because it talked about if it was exposed to air
Grade boundaries should be around 56 for an A. That's not unreasonable considering the paper Look at how many of the questions had not come up before in any way shape or form. First time I've seen cold drawing, First time I've seen 10marks worth of maths in one question (bromine number). First time recrystallisation has ever been 3 marks. First time heterogeneous catalysis has been asked. First time that we have been asked to show something is in excess.First time that I've seen a 5 mark question on rusting iron and been given 3 lines to put it on. It's an absolute disgrace of a paper and some action will have to be taken if the grade boundaries do not reflect it's difficulty. OCR if you are reading this then its not to say go and make F335 easy to make up for your questions. Make it like you do every year, so that those who work hard get what they deserve.
I drew 3 isomers because the isomer with one E and one Z double bond could just be reflected to get the isomers which has the E and Z's the other way round. Did anyone else put three because one of them could just be reflected in a mirror to get the other one?
Yes mate, I'm guessing the 4th mark was labeling them. It really should have been 5 marks for recognising that because that can take a minute of your time
Wouldn't the transition metal ion be surrounded by Aqua Ligands forming a complex ion which then undergoes ligand substitution to form the precipitate?
As the spec only says you need to know about [Fe(H20)6]2+ and [Fe(H20)6]3+ for iron complexes, I doubt it! But who knows!! 😄
Damn I put acts as salt bridge but then crossed it out and said allows current to flow, did this because the only ions mentioned in the entire question were those in the half-cell and those aren't supposed to mix. I'm pretty sure ur right though
There was no iodine question it was bromine numbers it got everyone confused. I've heard of iodine number before but not bromine. And correct me if I'm wrong but iodine numbers aren't F334 anyway. Either f331 or F335
Grade boundaries should be around 56 for an A. That's not unreasonable considering the paper Look at how many of the questions had not come up before in any way shape or form. First time I've seen cold drawing, First time I've seen 10marks worth of maths in one question (bromine number). First time recrystallisation has ever been 3 marks. First time heterogeneous catalysis has been asked. First time that we have been asked to show something is in excess.First time that I've seen a 5 mark question on rusting iron and been given 3 lines to put it on. It's an absolute disgrace of a paper and some action will have to be taken if the grade boundaries do not reflect it's difficulty. OCR if you are reading this then its not to say go and make F335 easy to make up for your questions. Make it like you do every year, so that those who work hard get what they deserve.