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Edexcel IAL Chemistry Unit 3 WCH03 May June 2016 Discussion

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Teacher said its 2KHCO3 -> K2CO3 + CO2 + H20. Another mark i lost :frown:
-418kJ/mol
:biggrin:
It was easy but I made some simple mistakes and I feel the grade boundary will be like 35 so I feel I will miss out on A 😢

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Na is also correct so congrats
Original post by AlonsoAMG
Teacher said its 2KHCO3 -> K2CO3 + CO2 + H20. Another mark i lost :frown:


ya i got that
Reply 365
Original post by AlonsoAMG
Teacher said its 2KHCO3 -> K2CO3 + CO2 + H20. Another mark i lost :frown:


Could somebody please tell me and show me exactly where in our specification does it say you have to know about the decomposition of hydrogen carbonates? I know carbonates are needed but seriously it doesn't even say! :s-smilie:
Original post by Sumaiyya1999
It was 41%

Are you sure it 41%, I was the only one who got it amoung my friends, most of them had something around 70 and two had 58%
Original post by I <3 WORK
Could somebody please tell me and show me exactly where in our specification does it say you have to know about the decomposition of hydrogen carbonates? I know carbonates are needed but seriously it doesn't even say! :s-smilie:


It does say all group2 HCO3s and LiHCO3 decompose to H20 + CO2 + XO
While group 1 HCO3s decompose to XCO3 + H20 + CO2
Original post by Sunethra
Are you sure it 41%, I was the only one who got it amoung my friends, most of them had something around 70 and two had 58%


Yes my teacher confirmed it and about 20% of my friends got this answer
Original post by Sumaiyya1999
Yes my teacher confirmed it and about 20% of my friends got this answer


I was stressed about it. That's great if its right. Good luck with the rest of your exam!
Original post by Sunethra
I was stressed about it. That's great if its right. Good luck with the rest of your exam!


Thanks
Best of luck for ur papers too
Original post by Sumaiyya1999
Thanks
Best of luck for ur papers too


guys how did u get the shape of the line in the graph i got it straight line going up
Original post by Sumaiyya1999
Thanks
Best of luck for ur papers too
i got the shape of line in the graph straight line going up
Original post by a.adi1998
guys how did u get the shape of the line in the graph i got it straight line going up


Same
Original post by Sumaiyya1999
Same

i mean its not going down its going up ya3ni like postive corelation
Original post by Saad69
It was easy but I made some simple mistakes and I feel the grade boundary will be like 35 so I feel I will miss out on A 😢

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It was easy but at the same time it was harder than the january paper, so A would be from 28-30
Original post by Hamadtype-
It was easy but at the same time it was harder than the january paper, so A would be from 28-30

guys in the question of the graph i got its shape like this
Original post by Sumaiyya1999
Same


Like a directly proportional graph right?

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Original post by I <3 WORK
Eeek I wrote 206 - 210 is that correct? Because I didn't want go below so I only went above. :/


I have no idea. I think I recall reading somewhere that it was + or - 2 from a actual boiling point?
Original post by Saad69
Like a directly proportional graph right?

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yes

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