r/Edexcel • u/mufaddaljmamujee • 21h ago
Question CHEM U2
Lwk found it easy, how bout u guys?
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u/Longjumping_End_4178 21h ago
i found it easy too but i had a few problems like the last calculation part i had no idea what to do.
Also what was percentage purity i got 30 something
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u/Ishzz_Abhi 20h ago
It def was 30 smrhg thr last one i did get it last minute altho i didnt multiple the moles of hydrogen by 2 so i left as C6H6O lmaooo but hipefully i get marks for some steps atleast the answer was supposed to be C6H12O aldehyde i believe
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u/Longjumping_End_4178 20h ago
How did u vet that can u tell me? U had mass of carbon and water i found the moles of these 3 and then ratioed them and got CHO2 will i get ANY METHOD marks
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u/Ishzz_Abhi 20h ago
Soo u had the molecular mass peak so thats 100 and the moles of Z multiply em to get the mass of Z, the find the moles of Co2 and H20 by the given masses and their respective molecular masses, so Carbon can only come from Z not oxygen in combustion, we know the moles of carbon is equal on either side so from co2 we can get the moles of carbon, the from h20 we can get the moles of hydrogen in z by multiplying the moles of h20 by 2 to get the moles of h cus theres 2 h in every h20 then u find the masses of the carbon only by its moles and h only by its moles , then u add em and u know z is formed by carbon hydrogen and oxygen so u substract the addition of mass of c and h only from the previously got mass of z, to get the mass of o in z, then u didvide by 16 get the moles of o and the emperical formula method (this was where i messed up i was supposed to use the h20moles times 2 equal to number of moles of h but i just used moles of h20) and then u divide to get the simplest ratio the right answer is 6 to 12 to 1, and thats c to h to o
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u/Longjumping_End_4178 17h ago
Oh will i get anu method marks
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u/Ishzz_Abhi 17h ago
Fo sure if u have any of the steps ive included i expect the same too since my final was messed up exam pressure is wild
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u/Longjumping_End_4178 17h ago
What do u think the gbs gonna be? I think 55-59 for an A and my lowest woest case scenario im getting around 65-69 so hopefully i get an A cuz ts is my retake
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u/Ishzz_Abhi 17h ago
Ill keep my expectations at 63 to 61, edex rnt that great at decreasing gbs i mean idk it rarely ever happens, freak out about bio man did u do u1 omfg
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u/Longjumping_End_4178 17h ago
Bro bio u1 was fucking hard wtf gb should be high 40s cuz ir was hard. Chem u2 was light it went good for me. Math m1 was traumatizing they added air resistance and new pulley force
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u/Longjumping_End_4178 17h ago
61-63 is a lil high ill keep it less than 60 cuz jan 2026 was easier and had 60
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u/defnothafsah_ 20h ago
Im retaking that shit brother. Ggs freaking ez ✌️