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Edexcel A2 Chemistry Exams -6CH04 (14th June) and 6CH05 (22nd June) Discussion Thread

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Original post by DesignPredator
I just said that racemic mixture could be formed with other optical isomer which could have harmful effects. To solve this find a process which is stereospecific.

I mentioned the stereospecific part
What do we reckon on grade boundaries


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Original post by GrandMasti
There were 3 steps in the sythesis of benzamide right? Oxidation by K2Cr2O7, then PCl5, then Ammonia to form the amide?


Yes that's what I did
Original post by GrandMasti
There were 3 steps in the sythesis of benzamide right? Oxidation by K2Cr2O7, then PCl5, then Ammonia to form the amide?


Do you think that was the only way to do it? I'm not sure about what I did now
Original post by Supermanxxxxxx
What do we reckon on grade boundaries


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Unfortunately quite high
Original post by Whizbox
Unfortunately quite high


So like 70/90 for an a


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Original post by Beautywithabrain
It was Zn(OH)2 wasn't it? That's amphoteric


Yep that's right :smile:
Original post by Funky_Giraffe
Ah ok. But it wasn't a disproportionation for the previous question, was it?


for the equation did it say ionic equation ?

i put cucl2 +hcl + cu = 2 (cucl2)- + 2H plus
Here's my reckoning with GBs

a* 76
a 72
b 68

then keep going down in 4's
Original post by lfcrules
yeah , just like when yoi have the fe 2 / fe 3 half cel you have both ions i think


was platinum electrode correct?
Original post by lfcrules
for the equation did it say ionic equation ?

i put cucl2 +hcl + cu = 2 (cucl2)- + 2H plus


I put that yes - although you would need 2HCl to balance. I'm talking about the question after this where it was like define disproportionation and hence say whether this is or isn't. It isn't is it?
Original post by lfcrules
for the equation did it say ionic equation ?

i put cucl2 +hcl + cu = 2 (cucl2)- + 2H plus


I put that, can't remember if it said ionic or not but I literally had no idea on that question
Original post by lfcrules
same


yess
Original post by nishofficial
was platinum electrode correct?


yeah
Original post by Funky_Giraffe
I put that yes - although you would need 2HCl to balance. I'm talking about the question after this where it was like define disproportionation and hence say whether this is or isn't. It isn't is it?


It is because copper metal is (0) and CuCl2 Copper is (2) and in (CuCl2)- Copper is (1) so it's simultaneously oxidised from 0 to 1 and reduced from 2 to 1
I messed up on the synthesis question :frown:
Original post by Whizbox
I put that, can't remember if it said ionic or not but I literally had no idea on that question


The ionic one was the hydroxide precipitate one.
Original post by Whizbox
It is because copper metal is (0) and CuCl2 Copper is (2) and in (CuCl2)- Copper is (1) so it's simultaneously oxidised from 0 to 1 and reduced from 2 to 1


oh crap :/
Ligand exchange for the 1 marker
Original post by lfcrules
for the equation did it say ionic equation ?

i put cucl2 +hcl + cu = 2 (cucl2)- + 2H plus


no im pretty sure it just said equation

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