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Aqa chem 4/ chem 5 june 2016 thread

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Original post by sztirmzi
I am sure you can put either Phosphorus or Sulfur for the first question. Is there anyone who can confirm it?


nope you cant it said in the question from Na to P which doesnt include S
Original post by sztirmzi
I am sure you can put either Phosphorus or Sulfur for the first question. Is there anyone who can confirm it?


It said that it ranged from elements Na-P
Original post by jonnypiercy
nope you cant it said in the question from Na to P which doesnt include S


how many marks was that question worth? 3?
Also, any1 get the equations for Al to show amphoteric?
Original post by Suits101
Spot on.



Wasn't R Cr(H2O)3(OH)3? If so then yes.



That's the proper way to do it :smile:


For working out detIa G i got vaIues from the previous questions but used the ones given incase i made any mistakes. It's fine to do this right?
Original post by sztirmzi
how many marks was that question worth? 3?


yeah i think it was 3/4 marks, but youd only drop 1 mark for saying sulpher
Original post by kyfer-19
Also, any1 get the equations for Al to show amphoteric?
using hcl and naoh plz
Original post by palacefloor
For working out detIa G i got vaIues from the previous questions but used the ones given incase i made any mistakes. It's fine to do this right?


Yeah! that's completely alright! don't worry
Was charecteristics of cobalt jus general transition netal properties? And how do you explain the ligand sub using thermodynamics
Original post by sztirmzi
Yeah! that's completely alright! don't worry


Thank uuuuu :smile:
For Q in the chromium chemistry I said NH3 not in excess and the gas produced was NH4+, do you think this could still be right?
Original post by kyfer-19
using hcl and naoh plz


Al2O3 + 6 HCl --> 2 AlCl3 + 3 H20

Al2O3 + 2 NaOH + 3 H20 --> 2NaAl(OH)4
I just remembered that I drew the complex with the ethane-1,2-diamine ligands in pencil. Is that okay :/


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Original post by kyfer-19
using hcl and naoh plz


Al203 + 6HCl -> 2AlCl3 + 3H20

3H2O + Al203 + 2NaOH -> 2NaAl(OH)4
image.jpeg
I put phase boundaries at both ends of the representation of a cell like this example in the picture 😭😭 will I lose the marks for that question?
Original post by mojogigi1234
Al203 + 6HCl -> 2AlCl3 + 3H20

3H2O + Al203 + 2NaOH -> 2NaAl(OH)4
thanks
Original post by EverydayHell
For Q in the chromium chemistry I said NH3 not in excess and the gas produced was NH4+, do you think this could still be right?


NH4+ isnt a gas. They were looking for CO2
Does anyone know whether they asked for the shape of the complex?
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Avatar for Jenza
Jenza
1
I forgot to draw the cobalt structure! How many marks would that be?
Original post by Jenza
I forgot to draw the cobalt structure! How many marks would that be?


at most 3, likely just 2 marks.

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