Chemistry OCR AS F321 Atoms, Bonds and Groups May 2012

The question near the beginning, when sulphur had like -2 and you had to work out the P N and E.
What was it?

calculating mr of the crystal ?

Yes it does ring a bell

yes that was hard! i put srcl2 and h2o gives sr(oh)2 is that correct you think?

so what you had to write this equation?? i swear the question was suggest the acid used in this reation??

someone please clarify?????!!!

was this easier or same level as june 2011? Also, the graphs did you draw for ionisation an increase but with two pint where it decreases then increases again ? and form atomic radius i started at high atomic radius for Na then it gradually decreased thats why i did was like a proportional graph similar

do you have to get 60/60 to get the full 90 ums or can you 59 and still get it, because in the coursework i heard people get like full ums even if they're 1/2 marks off full marks, does anyone know?

third time doing this paper.. made so many silly mistakes and hardly did any revision due to other subject classwork including the bada*s F325 ..

I drew the NH4 in one bracket with a + charge (a dative bond between one H) and then the Cl in a bracket with a - charge.
No idea if this is right though, I just couldn't find another way to do it

how many marks was the dot and cross diagram worth??

for that one with the mass of the anhydrous salt, did anybody get 4.5g?

3 marks i think!

how many marks was the dot and cross diagram worth??

Did anyone get 7.9g for the anhydrous compound mass?

Also, the positive ions in solution were the two dissociated ions from the Sr(OH)2 compound right? I.E, Sr^2- and 2OH^1-?

Did anyone get 7.9g for the anhydrous compound mass?

Also, the positive ions in solution were the two dissociated ions from the Sr(OH)2 compound right? I.E, Sr^2- and 2OH^1-?