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OCR chemistry F321 exam friday 13th jan 2012

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Reply 780
Original post by Jakez123
Ok, last question before i call it a day, for the question on why the student was unsure about the reactivity i practically wrote:

As you go down group 7 Reactivity decreases and Reactivity increases down group 2 therefore the student would be unsure over the most reactive compound.

I take it my answer would score no marks because i did not mention The compounds?


You may gain a mark, you have the general idea of what is happening and have shown that.
Reply 781
anyone got there paper back for the OCR jan 2012 chemistry (f321) paper back? and some one that could send me theres so i can compare answers! please! thank you! :smile:
Why is nitrogen in a state of +5 I'm having a dumb moment
v=n/c
n(HCl) = n(CaCO3) x2 = 0.015 mol
So v= 0.015/0.200moldm3
Because it is asking for it in cm3 you need to x1000
So answer is 75

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