OCR Chemistry F321 Exam. - [Next Tuesday[

I had to leave magnesium till last, the question was just taking me too long to get. I got just when they said pens down lol.

Some have said anhydrous was something like 7.9? It sounds familiar but I really don't remember to be honest. I was trying to be very careful I didn't lose any marks, that was my focus really...

Can't remember the numbers, but you had to get the moles of the hydrated thiosulfate, then multiply that by the MR of the anhydrous substance - obviously 1:1 stoich (Thiosulfate+5waters ---> Thiosulfate + 5H2O), and mass = moles by MR.


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I had to leave magnesium till last, the question was just taking me too long to get. I got just when they said pens down lol.

Some have said anhydrous was something like 7.9? It sounds familiar but I really don't remember to be honest. I was trying to be very careful I didn't lose any marks, that was my focus really...

No chance or it'd be 0 for an A every year. They figure it out based on how well everyone has done - if people are getting worse than usual, they boundaries will be lower and vice versa.

No higher than 48 this year I reckon, Y12s at my 6th form didn't like it at all, and Y13 resitters were dropping marks too.


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yh i tohught that was a tricky one it wasnt your average dot and cross. It was actually ionic even though it said dot and cross i got confused into drawing covalent bonds. In the end i had NH4 + in one bracket then in the other bracket the dot and cross with Cl (having gaine one electron form NH4) with a -. I didnt show dot and cross in the NH4.

how is it wrong when something has a charge + or - its always (aq) and i found the question paper on google it asked for magnesium not al so
get it right also the acid is h2so3 but i wrote h2so4

here the link search it for your self and then say im right and your wrong lol

http://getrevising.co.uk/files/documents/f321_chemistry_may_2012_mark_scheme/Unit%201%20Chemistry%20MAY%202012%20Answers.pdf

No chance or it'd be 0 for an A every year. They figure it out based on how well everyone has done - if people are getting worse than usual, they boundaries will be lower and vice versa.

No higher than 48 this year I reckon, Y12s at my 6th form didn't like it at all, and Y13 resitters were dropping marks too.


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In the paper on the link you provided he put down 94.3 as the relative atomic mass but the question states deduce the relative atomic mass of the group 2 metal. Shouldn't that be 24.3?

Does is say the relative atomic mass of the group 2 metal?
Coooocckkk, I put 94.3

Does is say the relative atomic mass of the group 2 metal?
Coooocckkk, I put 94.3

90 something, - 2 x 35.5 = 24.3
you were meant to put down the group 2 metal, ahh that must be so annoying.

90 something, - 2 x 35.5 = 24.3
you were meant to put down the group 2 metal, ahh that must be so annoying.

pride mate i counted mine all up i got like 12 wrong do you rekon thats a b or a a? :/

That is annoying! Oh well, should only be one mark cus I put Mg down and all my working was right
WHY DO I NEVER READ QUESTIONS PROPERLY
Ahaaa, A-levelsssss

Does is say the relative atomic mass of the group 2 metal?
Coooocckkk, I put 94.3

I don't think it was the relative atomic mass of the group 2 metal, as first of all, why would they ask for someone just to copy a number from the periodic table, and secondly on the paper they say 'give the relative atomic mass to one decimal place' therefore implying they want it of the whole compoud (not that i got this question right at all...it was terrible)

annoying.

I did something like that in maths, did the hard bit, forgot to subs back in. I was so sure I'd done the rest of that C1 paper correct, I was so sure of full marks...

what can you do eh?

I don't think it was the relative atomic mass of the group 2 metal, as first of all, why would they ask for someone just to copy a number from the periodic table, and secondly on the paper they say 'give the relative atomic mass to one decimal place' therefore implying they want it of the whole compoud (not that i got this question right at all...it was terrible)