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B (Salters) F331 (Chemistry for Life) 22nd May 2015 [Official Thread]

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Original post by ZoeWoah
I got C4H10O


I got that too :smile: because it was an alcohol :smile:
Original post by Darcy1
Its C4H10O


Would they allow 2-butanol?
Reply 282
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Original post by f.loco
General formula for alcohol is CnH2n+1O

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I think not

Lets try C(n)H(2n+1)OH

But for salters you have to write

C(n)H(2n+2)O

To get the mark

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Original post by f.loco
Youre right i fuccked up !!!

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oh dear should only be worth one mark, I counted to make sure!
(edited 8 years ago)
Original post by Darcy1
Yeah exactly so because they wanted you to work out the total volume of the gases which were all the products, 2 moles of peroxide made 3 moles of gas so the ratio was 1 : 1.5


You mean 1:1 1.5 aha, what did you get as your answer?
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Adam971
Original post by ZoeWoah
i thought it was CnH2n+1OH


Sometimes they won't allow OH at the end, they want the total of carbon atoms and then total of hydrogen atoms and then oxygen in that order
Original post by Elhamm
I got that too :smile: because it was an alcohol :smile:


Yes :smile:
Original post by KINGYusuf
Btw what did you guys say the use of zeolite was for cracking? I said catalyst


Me too, were you supposed to explain why or state that it speeds up the rxn? I didn't
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Original post by Adam971
Sometimes they won't allow OH at the end, they want the total of carbon atoms and then total of hydrogen atoms and then oxygen in that order


^this

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Original post by Adam971
Sometimes they won't allow OH at the end, they want the total of carbon atoms and then total of hydrogen atoms and then oxygen in that order

Yeah i got C4H10O :smile:
Original post by Adam971
ether


Yeah you're right.
(edited 8 years ago)
[QUOTE="Jessio;56116519"]You mean 1:1 1.5 aha, what did you get as your answer?[/QUOTE

1: 1.5

I got 138.97
Does anyone know a teacher who is an OCR Salters examiner? If so, their input would be highly valued
Original post by DominoMatrix227
Me too, were you supposed to explain why or state that it speeds up the rxn? I didn't


It says state & it's only 1 mark so I doubt it. But incase I wrote that it speeds up the reaction
Original post by DominoMatrix227
Does anyone know a teacher who is an OCR Salters examiner? If so, their input would be highly valued


My teacher is but he hates TSR lol
I lost 8 STUPID marks

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Original post by Marli-Ruth
My teacher is but he hates TSR lol


Could you please persuade him to do an unofficial mark scheme?
Original post by f.loco
I lost 8 STUPID marks

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Which questions?
Original post by DominoMatrix227
Could you please persuade him to do an unofficial mark scheme?


I'll email him :smile: btw what did you get for the why would Strontium replace Calcium in Calcium carbonate
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Original post by f.loco
I lost 8 STUPID marks

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Every mark lost on a Salters paper is stupid. Never has there been anything that I didn't know, the same probably goes for you.

3 mark questions have 3 mark points so no room for maneuver. Same goes for 1,2,3,4,5.... markers
Every marking point has something underlined. You are wrong if you don't mention it
Every question is the same every year but if you put last year's answer you are wrong
If you put the right answer you are wrong.

So dw bout it :smile:


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(edited 8 years ago)

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