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TODAY: Polyatomic Ions Read pages 41-42

TODAY: Polyatomic Ions Read pages 41-42 HW : Naming ionic compounds involving polyatomic ions HW: WS 6.4 Problems: chapter 2 problems 34, 36 and 38. POLYATOMIC IONS. tightly bound groups of atoms that behave as a unit and carry a charge most end in –ite or –ate

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TODAY: Polyatomic Ions Read pages 41-42

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  1. TODAY: Polyatomic Ions Read pages 41-42 HW: Naming ionic compounds involving polyatomic ions HW: WS 6.4 Problems: chapter 2 problems 34, 36 and 38

  2. POLYATOMIC IONS • tightly bound groups of atoms that behave as a unit and carry a charge • most end in –ite or –ate • exceptions: NH4+ – ammonium CN–– cyanide OH–– hydroxide

  3. POLYATOMIC IONS

  4. –ATE vs. –ITE • phosphate vs. phosphite PO43- PO33- • –ate = one more oxygen than –ite • charge is the same

  5. POLYATOMIC IONS • when a polyatomic ion begins with H, it is H+ + another polyatomic ion: • HCO3– is H+ and CO32– • HPO42– is H+ and PO43–

  6. TERNARY IONIC COMPOUNDS • contain three different elements • usually contain a polyatomic ion • balance the charge like a binary compound – treat the polyatomic ion as single unit

  7. TERNARY IONIC COMPOUNDS • calcium carbonate • lithium carbonate

  8. TERNARY IONIC COMPOUNDS • magnesium hydroxide • sodium phosphite

  9. TERNARY IONIC COMPOUNDS

  10. TERNARY IONIC COMPOUNDS

  11. http://chemistry.twu.edu/tutorial/NamIonCpd.html

  12. POLYATOMIC IONS FROM NOW ON: know NO CO SO PO ions (–ates and –ites) know NH4+ know –ides: cyanide, hydroxide know chlorine containing ions

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