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Basic chem question?

  1. Dec 3, 2009 #1
    If an element Z forms a compound with the formula AgZ, which of the following is a correct chemical formula?

    -CaZ2
    -Al2Z3
    -H2Z
    -NaZ3

    I dont really understand this at all and there is gonna be decent amount of them on my final exam! please any help
     
  2. jcsd
  3. Dec 3, 2009 #2

    ideasrule

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    Think charges. Since AgZ is an ionic compound, what charge must the Z have? How does this charge tell you whether a certain compound (CaZ2, Al2Z3, etc) is possible?
     
  4. Dec 3, 2009 #3
    CaZ2

    Ag ion has a charge of +1 which mean the charge on the Z anion must be -1.

    Ca ion has a charge of +2, so it takes two Z anions to bond with it.
     
    Last edited: Dec 3, 2009
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