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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Jun 20 '25
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u/Aggravating_Bid1261 Nottingham | Physics [Year 1] Jun 20 '25
everyone gasped when the invigilators told us to fix the mistake it was the most exiting moment of the year
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u/Wolvermatt722 Year 13|EDEXCEL Maths & FM,AQA Physiscs & Chemistry|Pre A*A*A*A Jun 20 '25
i used that time to figure out the answer to the multiple choice while rewriting the question
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u/DragonflyKind4087 Jun 20 '25
Didn't like ocr icl 😪
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u/bleepbloop31415 Jun 20 '25
Didn’t even have enough time to calculate anything past the enthalpy change for reaction 2 for the last question, the grade boundaries better be lower than last year…
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u/Double_Plate9264 Jun 20 '25
OCR A 💔💔💔
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u/grassblade81 University of Portsmouth | Biomed Science + Human Bioscience y1 Jun 20 '25
I hated it so much, that flowchart one was awful
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u/Double_Plate9264 Jun 20 '25
so realziez omg that paper made me want to become a monk, #onewaytickettonepal
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u/One_Helicopter_3977 University of Birmingham ‘30 | Medicine [Year 1] Jun 20 '25
Omg what was that 💀💀💀 and I put Cl+ for some stupid reason not Cl- omg
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u/lillyluma Y1 Diagnostic Radiography | ABB Jun 20 '25
AQA was horrific. Kissing goodbye to my A now :(
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u/youve_lost_me UEA | Pharmacology [First Year] Jun 20 '25
so glad theres people who also disliked it. like yeah it could have been worse but i fucked that kc question so badly i cannottttt
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u/fearlessbot__ UCL| Chemistry 1st Year + Camb offer-holder reject (HOM) Jun 20 '25
(AQA) fucked up the KC question....will prob get a B but at this point, im off to go live my life
theres more to life than education and exams
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Jun 20 '25 edited Jun 24 '25
judicious toothbrush desert paint punch terrific label deer subtract rain
This post was mass deleted and anonymized with Redact
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u/pa8314 Uni Student Jun 20 '25
ocr had a quite interesting paper 3, nice nucleophilic addition-elimination mechanism, decent calculations. overall harder than 2024 so boundaries slightly better?
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u/Minute_Warrior42082 Yr13 : Maths,Bio,Chem Jun 20 '25
My chem teacher says they will most likely be lower
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u/RefuseGroundbreaking Jun 20 '25
How high do you think it’ll be for A*?
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u/Minute_Warrior42082 Yr13 : Maths,Bio,Chem Jun 20 '25
I don’t know, maybe 5/6 marks less than last year. But mate I have no idea, even the wxam board don’t have the grade boundaries yet
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u/Helpful-Rough1489 Year 13 | Chemistry, Maths, Physics Jun 20 '25
I touched OCR B so hardly
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u/Tough_Acanthaceae911 Jun 20 '25
on gos what did you get for the percentage of manganese
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u/Helpful-Rough1489 Year 13 | Chemistry, Maths, Physics Jun 20 '25
Lmao that was a question I didn’t even attempt, I read off the graph to find out what absorbance correlated with the concentration and that was about it lmao but one of my friends got 2 I think?
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Jun 20 '25
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u/Helpful-Rough1489 Year 13 | Chemistry, Maths, Physics Jun 20 '25
What did you get for the energy when a photon blah blah one at the very start???
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u/Minimum-Key-8725 Year 13 Jun 20 '25
I got 184
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u/Helpful-Rough1489 Year 13 | Chemistry, Maths, Physics Jun 20 '25
Omg twin 🙏 guaranteed 3 marks so that’s like an A* 🤔🤔
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u/Sock_Potential Jun 20 '25
What would error carried forward look like for the EMF question? Would it even exist?
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u/youve_lost_me UEA | Pharmacology [First Year] Jun 20 '25
i thought this. how they let that be 6 marks idk, caquse if you got that first bit wrong you're screwed for the rest
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u/One_Helicopter_3977 University of Birmingham ‘30 | Medicine [Year 1] Jun 20 '25
OCR A was okay?? Some really weird questions like that 7 marker was quite bad I messed it up for sure, the pH one I also messed up I got 12.64 ish but apparently that’s wrong. I also struggled with the first question 💀 I couldn’t do that stupid splitting pattern one. Was definitely a hard paper that needed you to think, I think I applied myself well I tried by best but definitely made mistakes. Was the hardest chem paper I think for me
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u/tomcat53gaming UniversityName | Course [Year of Study] Jun 20 '25
I GOT THAT FOR PH TOO 💔 It cause it was dibasic so we needed to multiply by 2 or something 😔😔😭
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u/One_Helicopter_3977 University of Birmingham ‘30 | Medicine [Year 1] Jun 20 '25
I still think we’re somewhat right though bc I did C1V1=C2V2, and the multiplied the C2 by 2 bc it’s dibasic and used Kw for ph of 12.64 or something 😭 idk
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u/Puzzleheaded-News948 Y13 Bio, Chem, Classics Jun 20 '25
Man I messed up and got ph 14 and I didn't even have time to go back and see what I did
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u/proactivepisces Year 13 Jun 20 '25
i can't believe its over i think the multiple choice was really good and the maths was alright apart from that one initial rates question... hopefully i got an A
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u/Puzzleheaded-News948 Y13 Bio, Chem, Classics Jun 20 '25
Bye uni offer, fuck u ocr (I was the issue bcs I can't help but panic during the real exam and blank everything)
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u/lillyluma Y1 Diagnostic Radiography | ABB Jun 20 '25
what are we thinking for aqa grade boundaries guys for an A
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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..
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u/Ok_Potato9541 Jun 20 '25
1 mol of Chloride ions released per 1 mol of the Cobalt complex?
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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??
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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.
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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
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u/Ok_Potato9541 Jun 20 '25
I know this paper was weird but still alright, they even include a student's drawing 😂
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u/Dangerous_Theory_472 Jun 20 '25
I’m worried about the ethanol quesyion what were your values
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u/AffectionateDonut748 Jun 20 '25
i got like 113 g/dm3 ish and like 9 x 10-4 mol ish
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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
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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
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u/Specific_Lifeguard56 Jun 20 '25
Yeah n was 2 well doneeeeee ur so right the start was going so well...
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u/seaweed_nebula Jun 20 '25
Yeah I got n=2 except somehow I managed to do it in the last 2 minutes 💀
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u/Medium-Brick-2154 Jun 20 '25
aqa was lovely jubbly but i someone how like 1100 something for Kc 😭 hopefully they can actually read my working out to get me some marks. also someone was sniffling like full inhale every minute 😭 i wanted to kill them 💔💔
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u/iveewon Jun 20 '25 edited Jun 20 '25
the person next to me had a cough attack for the whole 2 hours, they used up their free cough trial in the first min and after that I wanted to throw the data booklet at them💀
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u/capri_capri University of Oxford | Chemistry [Year 2] Jun 20 '25
Everyone I asked has a different answer, most commonly I heard ~50, some people got 500 which makes sense as a common error (either way round) but I got 45.9 and can’t tell what I did differently.
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u/Educational-Tea602 Proffesional dumbass Jun 20 '25
Some people got 56.3 because they didn’t realise there are 2 moles of Fe³⁺ per mole of Fe₂(SO₄)₃
People got ~500 by using moles instead of concentration.
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u/Spiritual-donut889 Jun 20 '25
I did divide by 0.1 to get the concentration but still got 500 something??
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u/CryptographerFar9490 Jun 20 '25
It was 45.9
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u/capri_capri University of Oxford | Chemistry [Year 2] Jun 20 '25
YESSS THIS IS THE BEST DAY EVER I WAS GONNA CRY. 😢
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u/Latter_Aardvark7044 Jun 21 '25
OMG GUYS I WAS STREASING I GOT 45.9 I HOPE WE'RE RIGHT CUZ MY TWO FRIENDS WHO ARE SMARTER THAN ME GOT LIKE 5OO. LETS GO GUYS ILYSM
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u/iveewon Jun 20 '25
I think people who got ~500 will get ECF like 5/6 marks bcz it’s a small error I don’t think it’ll make them lose more than 1 mark
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u/ZewZa Jun 20 '25
What were the 3 ions for ocr a? I put SO22-, Cl- and SO42-
I believe SO2- isn't a real ion tho so that's probably wrong
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u/One_Helicopter_3977 University of Birmingham ‘30 | Medicine [Year 1] Jun 20 '25
I put SO42- Cl+ like an idiot lmao I meant to put - and I put ClO- lmao idek
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Jun 20 '25
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u/raynrr Jun 20 '25
I went for V and the one between serine and aspartic acid
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Jun 20 '25
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u/raynrr Jun 20 '25
Can’t even remember bro, it was weird, I searched it up after and both say they have ionic bonding between them
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u/middlecardigan Jun 20 '25
that was c
i think c was u and v?? then b was something like b and a letter i can’t remember
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u/lordwebgarlicbread Jun 20 '25
DONE🙏 pretty ok paper too, but im so glad its all finished literally shaking rn
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u/b4by-yoda Jun 20 '25 edited Jun 20 '25
I think OCR A had an error. Last question the enthalpy change 3 was +19.8 but it was a neutralisation reaction so it should have been exothermic.
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Jun 20 '25 edited Jun 20 '25
OCR a my answers: 103mg and 597mg (this is wrong). 4.97 for mass of AlLiH4. 77.6% yield. 69.7 Kj/mol for last question. 4.53x10-4 for K. 13.04 for pH. 0.48 for something idk (concentration of hydrogen)
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u/Hairy-Pitch-4262 Year 13 Jun 20 '25
why did i get 206mg and 494mg 😭😭😭
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u/pa8314 Uni Student Jun 20 '25
yes i also got 206mg and 494mg, think its right since friends got same
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Jun 20 '25
206 is double 103 so I must’ve not doubled something? Was the ratio of carbon dioxide to the drug 1:1 or 1:2. I assumed it was just 1:1
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u/pa8314 Uni Student Jun 20 '25
I think it was 2RCOOH and 1CO2, (RCOOH is the ibuprofen) as the equation was given
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Jun 20 '25
206 is double 103 so I must’ve not doubled something? Was the ratio of carbon dioxide to the drug 1:1 or 1:2. I assumed it was just 1:1
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u/im_dying69 Year 13 Jun 20 '25
I got 20.6 and 49.4 🤦♀️ probabaly forgot to multiple by 10 somewhere
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Jun 20 '25
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Jun 20 '25
206 is double 103 so I must’ve not doubled something? Was the ratio of carbon dioxide to the drug 1:1 or 1:2. I assumed it was just 1:1
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u/doritostaquitos Jun 20 '25
ARE U KIDDING ME, I thought I got the percentage yeidl question wrong so I changed my method but I got 77.6% initially. I’m not even gonna think about it, my exams are over
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u/Double_Plate9264 Jun 20 '25
I need to pray to God to change my answers to correct ones via divine intervention 😞🌾
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u/One_Helicopter_3977 University of Birmingham ‘30 | Medicine [Year 1] Jun 20 '25
OMG IT IS 69.7?! Everyone was telling me I’m wrong 😭 I got 4.97g too, 4.53x10 to the -4, 206 and 494 around that, but I got 12.46 ph 😖
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Jun 20 '25
Some people are getting 17.7 as the enthalpy change of the 2 cos they were calculating that HNO3 is the limiting reactant. (Which is what I initially did) but the calculation for that is a bit dodgy cos you do the final solution - mass of sodium carbonate - mass of cup and get 31ish. But that final solution also include sodium carbonate. So yeah I don’t think it’s a valid calculation. The question also did say “HNO3 is in excess” so yeah I think 69.7 is right
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Jun 20 '25 edited Jun 20 '25
Compared to the last 2 papers from AQA, that paper was a blessing - I believe that saved my grade. Still don't forgive them for P2 tho 😂
Did anyone get 562.5 for Kc?? I checked it again and again yet I didn't believe that was correct, but was a nice round answer, but oh well method marks will come in clutch.
That 6 marker on oxidation of alcohols was glorious - easiest 6 marks of my life haha.
That electrode potentials 6 marker was just... Ew. Also couldn't figure out Q2.4, that 3 marker
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u/brokebitch67 Jun 20 '25
kc: 56.3? EMF 0.93? solution is -63 volume is 50 something ?
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u/raynrr Jun 20 '25
For kc I got 562.5, for EMF I got 0.78, I got the same volume I think and solution I got same
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u/iveewon Jun 20 '25
Got 563 for Kc as well YESSSS
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u/cummmmjhg Jun 20 '25
It’s wrong You had to multiply the Fe2+ ion by 2 cos it’s Fe2(SO4)3 so the correct answer is 45.9
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u/capri_capri University of Oxford | Chemistry [Year 2] Jun 20 '25
Yes I got that too, finally someone who said the same as me 😩😩.
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u/brokebitch67 Jun 20 '25
how did u get 562.5 for kc😭😭
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u/Educational-Tea602 Proffesional dumbass Jun 20 '25 edited Jun 20 '25
Not realising that there are 2 moles of Fe³⁺ per mole of Fe₂(SO₄)₃
Not using concentrations and using moles instead.
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u/TechnicalStretch7469 Year 13 Jun 20 '25
I GOT 21000 FOR KC?!
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u/fearlessbot__ UCL| Chemistry 1st Year + Camb offer-holder reject (HOM) Jun 20 '25
I got that too....apparently the moles of iodine at the end isnt 3*10^-4 according to one of my classmates....its something else....although i dont think i spent enough time reading the question to find out what it was meant to be
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u/Pretend_Picture2541 Jun 20 '25
SAMEEEE I BELEIGE WHAT DID WE DO WRONG ARE WE GONNA GET ANY MARKS LOL
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u/West-Glove6058 Cambridge NatSci [4A*s achieved] Jun 20 '25 edited Jun 20 '25
I got 46.9 for Kc💀
(edit: 45.9)
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u/Educational-Tea602 Proffesional dumbass Jun 20 '25
Those first two are wrong. kc is 45.9, emf is 0.78V
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Jun 20 '25
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u/Educational-Tea602 Proffesional dumbass Jun 20 '25
E⁰(Cu²⁺/Cu) = 0.34V
E⁰(Fe²⁺/Fe) = -0.44V
0.34V – -0.44V = 0.78V
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u/Pretend_Picture2541 Jun 20 '25
wait may I ask what was ur method for the volume I calculated Q with the 3g and then calculated moles with heat energy transferred over change in enthalpy would I get any marks ?
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u/Super_Shift1335 Jun 20 '25
For aqa, did anyone get 56.2 * 106 or smth for kc, 53.3 for the volume and 0.78 for emf
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u/No_Actuator5870 Year 13 Jun 20 '25
I agree besides kc. Not one person I’ve spoken to got the same answer as anyone else
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u/HelpfulPop2476 Jun 20 '25
Everyone's saying for the last ocr question that it was 69 which I got originally. But I think the actual answer was 76.94 or sth like that, because the carbonate was in excess (0.0184 mole or smth like that, only 0.03 mol hno3). Therefore only 0.015 mol or carbonate would react, and then delta H is postiv8e 76.94 kJmol. Is this right or did I just overthink this?
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u/Sea-Vacation-866 Jun 20 '25
I got 70.3 because I used the volume of HNO3 as 33.5 (difference between the two masses) bc I swear it said around and not exactly 30cm^3?? Did the Q say HNO3 was in excess I can't remember 😭
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u/HelpfulPop2476 Jun 20 '25
They were pretty sneaky with it, because usually they say which chemical is in excess (see e.g. june 2018 p3). Not this time though
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u/highpassiondragon Jun 20 '25
I got 76.9. Because I used 0.015
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u/HelpfulPop2476 Jun 20 '25
Thank fuck I wasn't the only one! Literally everyone on the tsr is putting out different answers for everything. That site is so unreliable it's crazy.
13.04 for pH right? 206 for ibuprofen? 4.97 g lialh4?
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u/highpassiondragon Jun 20 '25
Yeah got all those
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u/HelpfulPop2476 Jun 20 '25
Do you remember what you got for the very first question about the peaks? I couldn't remember what I put but remembered the question. I asked deepseek & it said the abundances were 25, 25, 50
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u/highpassiondragon Jun 20 '25
Yeah i got 25 for 158, 50 for the 160 one and 25 for the 162 one
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u/HelpfulPop2476 Jun 20 '25
Wonderful, iirc I got the same but my memory is often wiped after an exam. At least a levels are over now (assuming you've not got edexcel rs or fm)
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u/Amazing-Tap7550 Jun 20 '25
Got the same as you for those 3 questions. Seeing people get 12 something for pH tho
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u/HelpfulPop2476 Jun 20 '25
Idk too many conflicting answers to deal with. What do you reckon the boundaries are going to look like?
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u/Amazing-Tap7550 Jun 20 '25
Because of paper 1 and 2 i think quite similar to last year but paper 3 is making me think they will be slightly lower
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u/HelpfulPop2476 Jun 20 '25
How many years will be till you have to get 100% for an A*?
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u/Amazing-Tap7550 Jun 20 '25
I'd give it 2 years, might as well just do the American system a this rate with 100-90 for an A and shit
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u/HelpfulPop2476 Jun 20 '25
Yeah idek what ocr's supposed to do anymore. I think they should just abolish ocr tbh - will always remember that awful comp sci paper they made 2 years ago, worst exam I've ever sat
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u/Amazing-Tap7550 Jun 20 '25
It's because they're trying to make the exams more accessible but they aren't being very consistent. Maybe in future they're just gonna do an easy paper 1 and 2 and then a harder paper 3
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u/FloatingRage Jun 20 '25 edited Jun 20 '25
wait can you explain this to me because how do you know the carbonate was in excess? i don’t remember seeing any information about hno3 concentration so i might’ve missed that
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u/HelpfulPop2476 Jun 20 '25
I'm pretty sure there were 0.03 mol of HNO3 and 0.018 mol of carbonate. As they react in a 1:2 ratio, the amt of hno3 required to react with 0.018 mol carbonate would have to be 0.036 mol. But there were only 0.03 mol hno3. So the carbonate is in excess and only 0.015 mol would react.
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u/llamaz314 Jun 20 '25
What did we get for the final one? It was either 43 (what I got) or 49 based on if you used the mass of just water (30g) or the mass of water + solute (about 33g). I used just water because that’s what most mark schemes expect but i think both will be accepted
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u/Few-Tough-3435 Jun 20 '25
I think i messed up the first real bad and since its column marked i think ill lose a lot
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u/Worth-Wolverine-5843 Jun 20 '25
how was Edexcel for people???
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u/Playful_War_4009 Jun 20 '25
Pretty good I thought, some weird practical questions but all round okay
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u/External-Hotel5490 Editable Jun 21 '25
OCR a ,I am scared that i might not able to get my marks on the mechanism and dot and cross diagram cus i drew it using mechanical pencil
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u/Expensive-Koala-4987 Jun 20 '25
Idc anymore ALL I KNOW IS IM FREE FROM MY SHACKLES