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Edexcel Chemistry Unit 1 - 2015 (6CH01) Unofficial Mark Scheme

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Original post by BaranSR
I saved the answers for the multiple question on my calculator, these are not right!! Especially the first one its suppose to be B


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How is it?
Original post by MoHoosen9167

22d
Error 1: There shouldn't be partial charges on the Chlorine
Error 2: The arrow should go from the double bond to Chlorine, not the other way around
Error 3: The Chlorine in step 2 should have a lone par/negative charge to make it a Chloride


Error 1 is wrong. You can show partial charges on the chlorine.
It was wrong because they had them the wrong way round. The arrow from C=C should have gone to a delta positive Cl ion not to a delta negative Cl.
Original post by NineTailedFox
Error 1 is wrong. You can show partial charges on the chlorine. It was wrong because they had them the wrong way round.


Thank you!
Original post by BaranSR
I saved the answers for the multiple question on my calculator, these are not right!! Especially the first one its suppose to be B


Posted from TSR Mobile


First of all, it's a multiple choice question so how can "especially" apply? Second of all, C was but-1-ene. The question was: "which of these does not show E/Z isomerism?" and but-1-ene doesnt.
Original post by MoHoosen9167
I'm remembering the long response ones and yay unit 2


Yeah me too actually! last part of Q20 is the whole diagram thing exo/endo

Original post by BaranSR
I saved the answers for the multiple question on my calculator, these are not right!! Especially the first one its suppose to be B


Posted from TSR Mobile


He's just writing his answers, chill. He's not the freaking examiner lmao
Original post by MoHoosen9167
First of all, it's a multiple choice question so how can "especially" apply? Second of all, C was but-1-ene. The question was: "which of these does not show E/Z isomerism?" and but-1-ene doesnt.


Im sure the question was which on does show E/Z isomerism? :s-smilie:
Original post by Nautic4l
Yeah me too actually! last part of Q20 is the whole diagram thing exo/endo



He's just writing his answers, chill. He's not the freaking examiner lmao


And plus, he got his wrong anyway.
Original post by NineTailedFox
Im sure the question was which on does show E/Z isomerism? :s-smilie:


No, it was in bold: Which of these compounds does not exhibit E/Z isomerism?
Original post by MoHoosen9167
Thank you!


Stupid arrow! I phrased it so weirdly.

I didn't quite say about the arrow going from chlorine to double bond :frown:
Original post by MoHoosen9167
No, it was in bold: Which of these compounds does not exhibit E/Z isomerism?


aw :frown:
Does not
Original post by NineTailedFox
Im sure the question was which on does show E/Z isomerism? :s-smilie:



Original post by MoHoosen9167
And plus, he got his wrong anyway.


Lool yep
Original post by MoHoosen9167
x


Going to revise Unit 2 now :tongue:
Original post by frozo123
was it -795 for the born haber? if yes think I got 19/20 ,meh


how did u arrive at this?? did u have to turn any signs around??
For the questikn on the carbocation why are people mentioning inductive effect and methyl groups , doesnt that only apply to addition of hbr to unsymmetrixal alkenes
second last question the mas was 7.45g!!
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Ec0n
1
The born-haber was -242 (roughly)... no?
Original post by Faaiz Shah
how did u arrive at this?? did u have to turn any signs around??


you just went round in a circle lol
was too easy to be true, but turns out it was
Original post by Ec0n
The born-haber was -242 (roughly)... no?


Which born-harber are you talking about? I remember the bond enthalpy being something like that, but the born-harber I think was -795 or something...
the minimam mass calculation :

250 x 4.18 x 25= 26125 /1000 = 26.125kj

26.125/ (x) moles = -192
so to find x rearrange > 26.125/192 =0.136 moles x Mr = 7.5 ish ... i dunno if it was -192.. close to
Original post by Faaiz Shah
how did u arrive at this?? did u have to turn any signs around??


∆Hf=∑all the values

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