GCSE Chem help?

Chemistry exam discussion - share revision tips in preparation for GCSE, A Level and other chemistry exams and discuss how they went afterwards.

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  1. Ingamo's Avatar
    1 24-06-2012  17:10
    • Junior Member
    • Posts: 47
    GCSE Chem help?
    Heey I am sitting my OCR c4 c5 c6 exam tomorrow and I think I understand the majority but I have come across a question which I am unsure of.
    It is in the Jan 2010 paper (http://pdf.ocr.org.uk/download/pp_10...e_a322_02.pdf? ) And it is question 4)c)ii).
    The question is - Copper ions have the symbol Cu2+, what is the formula for copper bromide?
    The answer is CuBr2 and I am unsure of how that is! :P

    Cheeers!
  2. MeatyBeast's Avatar
    2 24-06-2012  17:28
    • Junior Member
    • Posts: 28
    Re: GCSE Chem help?
    Cu has a 2+ charge so to balance it two bromide ions are needed. Bromide ions have a -1 charge each so -1x2=-2 which balances the 2+ charge
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