Polyatomic Ions Note and Worksheet

Polyatomic Compounds: Names and Formulas Worksheet Polyatomic Ions – are groups of atoms that tend to stay together and carry an overall ionic charge. Examples ammonium 𝑁𝐻4+ carbonate 𝐶𝑂32− To name compounds with polyatomic ions: Follow the same rules as ionic compounds. Example 1 STEP 1 & 2 calcium hydroxide Find the ionic charge for each part of the compound. Write the symbol of each part below its ionic charge. 2+ 1- Ca OH STEP 3 Crisscross the numbers and use them as subscripts. Brackets are used if there is more than one of the polyatomic ions required. Ca(OH)2 STEP 4 It is already reduced to the lowest whole number ratio. Polyatomic Ions (continued) Example 2 sodium phosphate STEP 1&2 1+ 3- Na 𝑃𝑂4 STEP 3&4 𝑁𝑎3 𝑃𝑂4 1. Write the formulas for the following compounds. a. magnesium sulphate ____MgSO4_______________________ b. sodium chlorate __________NaClO3_________________ c. aluminum nitrate ______Al(NO3)3_____________________ d. potassium hydroxide _______KOH____________________ e. lithium phosphate __________Li3PO4_________________ f. calcium carbonate _______CaCO3____________________ g. beryllium sulphate _________BeSO4__________________ h. sodium bicarbonate ______NaHCO3_____________________ i. magnesium hydroxide _______Mg(OH)2____________________ j. aluminum phosphate ________AlPO4___________________ k. copper(I) chlorate _______CuClO3____________________ l. ________CaSO4___________________ calcium sulphate m. sodium chlorite _______NaClO2__________________ n. ammonium bicarbonate _______NH4HCO3________________ o. magnesium hypochlorite _______Mg(ClO)2________________ p. lead(II) nitrate ________Pb(NO3)2___________________ q. tin(IV) sulfate ________Sn(SO4)2________________ r. copper(II) hydroxide _______Cu(OH)2____________________ s. iron(II) phosphate __________Fe3(PO4)2_________________ 2. Write the names for the following compounds. a) Li2CO3 ___lithium carbonate___________________________ b) Al(HCO3)3 ______aluminum bicarbonate________________________ c) Mg3(PO4)2 _____magnesium phosphate_________________________ d) Ca(NO3)2 _____calcium nitrate_________________________ e) K2SO4 ________potassium sulfate______________________ f) TiPO4 ________titanium(III) phosphate___________________ g) NaNO3 _______sodium nitrate_______________________ h) Al(OH)3 _____aluminum hydroxide_________________________ i) CuSO4 _____copper (II) sulfate_________________________ j) Fe(ClO3)3 ____iron (III) chlorate__________________________ k) Pb3(PO4)2 _____lead (II) phosphate_________________________ l) Sn(ClO3)2 _______tin (II) chlorate_______________________ m) NaOH _____sodium hydroxide_________________________ n) NH4Cl ______ammonium chloride________________ o) (NH4)2CO3 ______ammonium carbonate_________________ p) CuNO3 _____copper (I) nitrate_________________________ q) NaCN _____sodium cyanide___________________ r) FeSO4 _____iron (II) sulfate_________________________ s) Ca(HCO3)2 _____calcium bicarbonate_________________________ t) K3PO4 ______potassium phosphate ________________________