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Sweet 16 Chemistry tournaments
Rules for advancing are: (see below)
*__Ni(II)2+______ ]
]_________
*__Cl __________]
]
]______________
2+
*___Fe(II) _____]
]
]
]_________ ]
]
_____S_________ ]
]
]______________
2+
*___Zn _______ ]
]
]_________
]
_____CO3______ ]
]
]
]______________ ]
_____Na_______ ]
]
]_________ ]
2*____CrO4 ____ ]
]
]
]
]
]
]
]
]_______________
2+
*__ Mg ______ ]
]
]_______________
]
3*__PO4 _______ ]
]
]
]_________
]
1+
*___Ag(I) _____ ]
]
]
]
]______________ ]
]
]
_____SO4_______ ]
]
]
]______________ ]
____Ba________ ]
]
]____________
]
_____NO3______ ]
]
]
]___________ ]
_____Al_______ ]
]
]____________]
____OH________ ]
Flinn Scientifics Sweet 16 Chemistry Ion Tournament
First Round: * Partially done for you, continue to write the correct ionic charge.
Second round: write the correct formula for the compound formed from these ions.(remember
compounds are neutral)
Semifinals: Advance one of the compounds from the second round, the more soluble compound.
Final round: Do a double replacement reaction with the compounds from the semifinals and
write in the new compound that is soluble.
Winner: Do a double replacement reaction with the two finals and write in the Insoluble product.
(the “winner” is the insoluble product generated from all these reactions)
Hints:
Solubility Rules
1. All compounds containing alkali metal cations and the ammonium ion are soluble.
2. All compounds containing NO3-1, ClO4-1, ClO3-1, and C2H3O2-1 anions are soluble.
3. All chlorides, bromides, and iodides are soluble except those containing Ag 1+, Pb2+, or Hg2+.
4. All sulfates are soluble except those containing Hg2+, Pb2+, Sr2+, Ca2+, or Ba2+.
5. All hydroxides are insoluble except compounds of the alkali metals, Ca2+, Sr2+, and Ba2+.
6. All compounds containing PO4-3, S-2, CO3-2, and SO3-2 are insoluble except those that also contain alkali metals or NH41+.
The above are general rules of solubility that it is advantageous to memorize (especially for the AP chemistry test or to solve the sweet 16 ion
tournament)
Sweet 16 Chemistry tournaments
(see below)
(Partial)ANSWER KEY
Rules for advancing are:
*__Ni(II)2+______ ]
]__NiCl2___
*__Cl __________]
]
]_____NiCl2_____
2+
*___Fe(II) _____]
]
]
]__FeS____ ]
]
-2
_____S ________ ]
]
]____NaCl______
2+
*___Zn _______ ]
] (soluble product)]
]__ZnCO3_
]
]
-2
_____CO3 _____ ]
]
]
]
]___Na2CrO4____ ]
]
1+
_____Na ______ ]
]
]
]_Na2CrO4_]
]
2*____CrO4 ____ ]
]
]____________
2+
*__ Mg ______ ]
]
(Insoluble product)
]_________ _]
]
3*__PO4 _______ ]
]
]
]_________ ___
]
1+
*___Ag(I) _____ ]
]
]
]
]_________ ]
]
]
_____SO4______ ]
]
]
]______________ ]
____Ba_______ ]
](soluble product) ]
_____NO3_____ ]
]
]
]_________
]
_____Al_______ ]
]
]_________ ]
1____OH _______ ]