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(2.2) IONIC COMPOUNDS (p128-129)

(2.2) IONIC COMPOUNDS (p128-129). NAMES & FORMULAS. Compounds. Recall: There are two main types of compounds: IONIC and MOLECULAR NaCl , K 2 SO 4 H 2 O, C 6 H 12 O 6. Ionic Compounds. Ionic compounds are formed by combining a metal and a non-metal.

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(2.2) IONIC COMPOUNDS (p128-129)

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  1. (2.2) IONIC COMPOUNDS (p128-129) NAMES & FORMULAS

  2. Compounds Recall: There are two main types of compounds: • IONIC and MOLECULAR NaCl, K2SO4 H2O, C6H12O6

  3. Ionic Compounds • Ionic compounds are formed by combining a metal and a non-metal. • The positive ion (from the metal) and negative ion (from the non-metal) bond to each other.

  4. Ion Symbols and Names • The symbol for an ion is the element symbol with a superscript showing the ionic charge • Metals: The name does not change from the element name unless the element is multivalent (can form different ions). • Na1+ Ca2+ Cu1+ Cu2+ sodium calcium copper Icopper II

  5. Ion Symbols and Names • Non-Metals: The name changes its ending to “ide” • Cl1- O2- S2- chloride oxide sulfide

  6. Naming Ionic Compounds • An ionic compound has a two-part name:

  7. Naming Ionic Compounds-Practice a) sodium & chlorine b) potassium & oxygen

  8. Formulas for Ionic Compounds • What is the chemical formula for the ionic compound formed by magnesium and oxygen? • STEP ONE: • Write the symbol for each element.

  9. Formulas for Ionic Compounds • STEP TWO: • add the ionic charges of each

  10. Formulas for Ionic Compounds • STEP THREE: • Criss-cross the charges

  11. Formulas for Ionic Compounds • STEP FOUR: • Write the formula using subscripts. • STEP FIVE: • Simplify or reduce the ratio, if possible

  12. Formulas for Ionic Compounds Try these: aluminium and oxygen potassium and nitrogen copper I and sulfur

  13. Answers: • Al2O3 • K3N • Cu2S

  14. “Weirdos” • Multivalent elements can form ions more than one way • There has to be a method of identifying which valence (charge) is used • Pb, Fe, Cu, Sn, Co to name a few.

  15. Multivalent elements • Pb2+ 4+ on the periodic table means lead II (Pb2+) or lead IV (Pb4+) • Fe2+ 3+ iron II or iron III • Cu1+ 2+  copper I or copper II • Sn2+ 4+  tin II or tin IV

  16. WEIRDOS • CuCl  • CuCl2  • Fe2O3 

  17. HOMEWORK • Worksheet 2.2 (A) compound naming - both sides!

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