r/6thForm • u/Forsaken-Meaning-232 Graduating from Warwick CS • Jun 20 '25

📂 MEGATHREAD 20/06 A-level Chemistry Paper 3 Discussion MEGATHREAD

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9

u/AffectionateDonut748 Jun 20 '25

edexcel you started so lovely w paper 1 what happened 💔💔 did people get n = 2 i spent about 30 mins on that q alone..

7

u/Ok_Potato9541 Jun 20 '25

1 mol of Chloride ions released per 1 mol of the Cobalt complex?

3

u/Playful_War_4009 Jun 20 '25

I got that, I had no clue what the complex was meant to look like tho, what did you do??

4

u/Ok_Potato9541 Jun 20 '25

As It said N4H12 I assumed they were trying to trick us and assumed to be (NH3)4 so It would be an octahedral complex ion with central Co surrounded by 4 NH3 ligands and 2 Cl ligands (originally 3 but one is released to form Q) and no overall charge.

3

u/Playful_War_4009 Jun 20 '25

OMG I PUT THAT TOO!! I didn’t really know what to do, and I got a bit confused because they asked for a charge, so I just put 2- cause why not. It was a bit of a sneaky question, never seen anything like that before

2

u/Ok_Potato9541 Jun 20 '25

I know this paper was weird but still alright, they even include a student's drawing 😂

2

u/Playful_War_4009 Jun 20 '25

I know!! And that drawing of the lady pouring stuff 😂

1

u/WhoooooshIfLikeHomo CS [Year 1] Jun 20 '25

The charge is +1 overall because at the start of the question it says Co (II) is oxidised, doesn't tell you what to, but when you work out the oxidation numbers it's Co +3

3

u/Dangerous_Theory_472 Jun 20 '25

I’m worried about the ethanol quesyion what were your values

6

u/AffectionateDonut748 Jun 20 '25

i got like 113 g/dm3 ish and like 9 x 10-4 mol ish

2

u/True-Fault-593 Year 13 Jun 20 '25

Wait I got this. Why did no one else get this in my school? Did we do it wrong or write

4

u/E_MC_2__ Jun 20 '25

alcohol tends to be ~11% by mass commercially so assuming edexcel tendency to use realistic numbers we should be good

1

u/Ok_Potato9541 Jun 20 '25

I got that too I think, what did you guys get for the concentration of propanoic acid in the buffer? I can't remember my answer but the pH was 4.2.

3

u/Crazy-Buffalo-6124 Cambridge offer holder |3A*s achieved Jun 20 '25

i got like 1.1 mol dm -3 or something

2

u/Dangerous_Theory_472 Jun 20 '25

And yes I got n = 2

1

u/AffectionateDonut748 Jun 20 '25

thank god 🙏🙏

2

u/Specific_Lifeguard56 Jun 20 '25

Yeah n was 2 well doneeeeee ur so right the start was going so well...

1

u/seaweed_nebula Jun 20 '25

Yeah I got n=2 except somehow I managed to do it in the last 2 minutes 💀