CHEM11 3-10 Some groups of atoms act as individual compounds e.g.SO 4 2- Sulphate ion OH - Hydroxide ion PO 4 3- Phosphate ion When writing formulas and.

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CHEM Some groups of atoms act as individual compounds e.g.SO 4 2- Sulphate ion OH - Hydroxide ion PO 4 3- Phosphate ion When writing formulas and naming, pretend the polyatomic ion is just one atom and follow the rules as usual. e.g. KPO K PO 4 13 K 3 PO 4 Potassium phosphate Don’t change the endings of polyatomic ions

CHEM Aluminum sulphate Copper II sulphate AlSO Al SO 4 32 Al 2 (SO 4 ) 3 Cu 2+ Cu SO 4 22 Put brackets around the SO 4 to indicate 3 sulphate ions, not 43 oxygen atoms SO 4 2- Don’t forget the roman numeral since copper has more than one combining capacity See the back of your periodic table for the names and formulas of important polyatomic ions.

CHEM Hydrates are ionic compounds with water molecules attached e.g. - each copper II sulphate is attached to 5 water molecules CuSO 4 5H 2 O Copper II sulphate pentahydrate e.g. FeSO 4 6H 2 O Iron II sulphate hexahydrate

CHEM HCl HF HNO 3 Hydrochloric acid Hydrofluoric acid Nitric acid HNO 2 H 2 SO 4 Nitrous acid Sulphuric acid

SC Page 55 “Review & Practice” Q: 5-7 Worksheet (Q front, 1-26 back) Homework: