Ch 3 WS 3 Polyatomic Ions Revised KEY by 5r7y0Np

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									Chapter 3 – Ionic Bonds
Science 9


                     WORKSHEET – Polyatomic Ions KEY
Name: ___________________ Date: ________________ Block: ___________

Complete the chart. Use the back of your periodic table to find the polyatomic (or
radical) ions.

            Ions             Formula                   Name                  Number of
                                                                              Atoms in
                                                                              Formula
                             Na2SO4               sodium sulphate                7
    Na+       SO42

                            (NH4)2SO4           ammonium sulphate                15
    NH4+     SO42


    Ca2+      NO3          Ca(NO3)2              calcium nitrate                    9


    Ag+       ClO3          AgClO3               silver chlorate                    5


    Zn2+      HCO3         Zn(HCO3)2            Zinc bicarbonate                11


    Ti3+      SO32         Ti2(SO3)3            Titanium sulphite               14


    Sc2+     CO32           Sc CO3            Scandium carbonate                    5


    Al3+     PO43            AlPO4           Aluminum phosphate                     6


    Na+      Cr2O72        Na2Cr2O7           Sodium dichromate                 11


Explain how you:
   a) Name a compound that includes a polyatomic ion. Write the metal name, then
       write the polyatomic name (don’t change anything to “ide”).
       Ex. Titanium + sulphite  titanium sulphite

   b) Write the formula for a compound that has a polyatomic ion. Write the metal,
      then polyatomic formula. If there are more than one polyatomic ions
      needed, put brackets around the ion and a subscript to indicate how many.
Chapter 3 – Ionic Bonds
Science 9

Complete the chart. Use the back of your periodic table to find the polyatomic (or
radical) ions.

                                                                            Number of
             Name                        Ions               Formula
                                                                             Atoms

 ammonium permanganate            NH4+ MnO4               NH4MnO4              10


 calcium phosphate                Ca2+ PO43               Ca3(PO4)2            13


 calcium nitrite                   Ca2+ NO2               Ca(NO2)2              7


 magnesium acetate              Mg2+ CH3COO            Mg(CH3COO)2             15



 potassium carbonate               K+     CO32             K2CO3                6


 zinc hydroxide                    Zn2+ OH                Zn(OH)2               5


 lithium nitrite                   Li+     NO2              LiNO2               4


 zinc perchlorate                 Zn2+ ClO4-1              Zn(ClO4)2            11


 sodium cyanide                    Na+      CN              NaCN                3


 beryllium chromate               Be+2     CrO4-2           BeCrO4               6


 Ammonium sulphate                NH4+ SO42              (NH4)2SO4
                                                                                15

								
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