Download CHEMISTRY NAME POLYATOMIC ION COMPOUNDS 12-1

CHEMISTRY
POLYATOMIC ION COMPOUNDS
NAME ________________________________
12-1-14
I CAN _________________________________________________________________________________________
BINARY vs POLYATOMIC COMPOUNDS
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Up to this point, we’ve only looked at _____________________________________….compounds containing
only ____________ different elements.
However, not all compounds are binary!
Compounds of ____________________________________________________________ often contain
__________________________________.
– The prefix ____________ means “___________________________” or “__________________”
POLYATOMIC ION – _______________________________________________________________________
_______________________________________________________________________________________.
There are MANY polyatomic ions.
The following list is a _________________ listing of the more common polyatomic ions, sorted by charge.
POLYATOMIC ENDINGS
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Just like __________ generally means you have a ________________________, the endings of polyatomic
ions mean something too:
– If you see an ________ or ________ ending on a compound’s name, that indicated the presence of
a polyatomic ion.
– Both _________ and __________ mean the polyatomic ion contains ____________ along with other
elements.
– If there are _______________________________________________________________________,
the one with the ____________ oxygen atoms has the ___________ ending while the one with the
___________ oxygen atoms has the __________ ending.
EXAMPLE
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Nitrite and Nitrate are two polyatomic ions consisting of _______________ and _________________.
Nitr_____ = NO___
while
Nitr______ = NO___
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_____________________
EXCEPTION Note that ________________ and ____________________ both end in _________. Their
___________________ and they _______________________________ in them, so the older names are still used
even though _________ generally indicates a ____________ compound.
WORKING WITH POLYATOMIC IONS
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Writing formulas for compounds containing ______________________________ is very similar to writing a
______________________________ formula.
– Write the ____________________________ first, writing its __________________ above.
– Write the ___________________________ second, writings its ________________ above.
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If the charges ___________________________use the _____________________________ method
to balance the charges.
Write the _________________________________.
USING A POLYATOMIC ION
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Writing a polyatomic formula often requires one more step.
– Since most polyatomic ions_______________________________, you _______________________
____________________________on:
– For example:
• Suppose you needed to add a subscript of ____ on to the polyatomic ion Carbonate: ______
• Why can’t you just do this? _________ or ________
• ___________________________________________________________________!!
So how do you add a subscript to a polyatomic ion?
You first ________________________________________________________________________________.
Then add the __________________________________________ the parenthesis.
REMEMBER that a ________________________________________________________________________!
So the proper way to add a subscript of_____ to the _____________________________________________
would be:
PRACTICE PROBLEM
Write the formula for a compound of Aluminum and Sulfate.
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Since a subscript of ______ must be added to sulfate when writing the formula, first ___________________
______________ inside a PARENTHESIS before adding the subscript like this:
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So the formula becomes:
MORE PRACTICE Write the formula for Ammonium Phosphate.