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Ionic Bonding Day 2

EQ: What are the guidelines to write and name Ionic formulas?. Ionic Bonding Day 2. Writing Ionic Formulas. Binary compounds are made up of two elements. Binary ionic compound are made up of a metal and a nonmetal. Writing ionic formulas. Ex: potassium chloride

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Ionic Bonding Day 2

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  1. EQ: What are the guidelines to write and name Ionic formulas? Ionic Bonding Day 2

  2. Writing Ionic Formulas • Binary compounds are made up of two elements. • Binary ionic compound are made up of a metal and a nonmetal.

  3. Writing ionic formulas Ex: potassium chloride • Write symbols for both ions including charges • Check to see if charges balance K+ Cl- Balanced! Formula is: KCl

  4. Writing ionic formulas Ex: calcium bromide • Write symbols for both ions • Check to see if charges balance • If not balanced use subscripts to balance charges Ca2+ Br- Notbalanced! Formula is: CaBr2 1(2+) + 2(1-) = 0

  5. Writing Ionic Formulas Ex: calcium sulfide • Write Symbols • Crisscross • Check to see if subscripts can be reduced Ca2+ S2- Formula is: Ca2S2 Reduce!! Formula is: CaS Correct!!

  6. Predicting Ionic Charges • Groups 3-12:Many transition elements have more than one charge Iron(II) = Fe2+ Iron(III) = Fe3+ If an element forms more than one ion, a Roman numeral is used to indicate the charge

  7. Predicting Ionic Charges • Groups 3-12:Some transition elements have only one oxidation state Zinc = Zn2+ Silver = Ag+ No Roman numeral is used for elements that have only one oxidation state

  8. Writing Ionic Formulas Ex: Iron(III) Oxide • Write all symbols • Check to see if charges balance • Use subscripts to balance Fe3+ O2- Not balanced! Formula is: Fe2O3 2(3+) + 3(2-) = 0

  9. Writing Ionic Formulas Ex: Iron(III) oxide • Another method for writing balanced formulas is the crisscross method • First write symbols • Charge of one ion is used as subscript for other ion Fe3+ O2- Fe2O3

  10. Writing ionic formulas Remember the Steps • Write symbols • Crisscross • Reduce if needed You Practice Sodium iodide Tin(IV) chloride Potassium sulfide Calcium iodide

  11. Polyatomic ions • Polyatomic ions are tightly bound groups of atoms that behave as a unit and carry a charge. • For instance the sulfate anion, SO42-,is made up of one sulfur atom and four oxygen atoms and has a 2- charge. • You will need a list of polyatomic ions to determine the name and formula

  12. Writing ionic formulas • Ionic compounds that contain a polyatomic ion are called ternary ionic compounds • The names usually end in ate or ite and you need to remember to look up the formula of the polyatomic ion

  13. Writing ionic formulas Ex: calcium nitrate • Write symbols • Crisscross to balance • If the polyatomic ion requires a subscript, place parentheses around the ion Ca2+ NO3- ( ) Ca NO3 2

  14. Writing ionic formulas Ex: lithium carbonate • Write symbols • Crisscross and write formula using parentheses if needed • Notice that no parentheses are needed if only one polyatomic ion Li+ CO32- Li CO3 2

  15. Writing ionic formulas Ex: magnesium hydroxide • Remember that the hydroxide ion also needs parentheses Mg2+ OH- Mg ( OH ) 2

  16. Writing Ionic Formulas Remember the Steps • Write symbols • Crisscross • Use parentheses if needed • Reduce subscripts if needed You Practice! ammonium sulfite calcium phosphate magnesium carbonate

  17. Naming Ionic Compounds Ex: NaI • Name the first ion • Name the second ion • Remember that negative ions end in ide The name of the compound is: sodium iodide

  18. Naming Ionic Compounds Ex: CuO • Name the first ion • Recall that the copper ion can be either Cu+ or Cu2+ • Since O has a 2- charge is must be Cu2+ or Copper(II) • Name the second ion The name of the compound is: copper (II) oxide

  19. Naming Ionic Compounds Remember the Steps • Name the first ion • Check to see if it needs a roman numeral • Name the second ion You Practice!! ZnS KCl CuBr2 FeS

  20. Naming Ionic Compounds Ex: K2Cr2O7 • If a formula contains three or more elements, it contains a polyatomic ion • You must look up the name • Cr2O72- is the permanganate ion The name of the compound is: potassium permanganate

  21. Naming Ionic Compounds Remember the Steps • Name the first and second ions • Remember to check if the metal requires a roman numeral • If it is a ternary compound look up the polyatomic ion You practice!! CaC2O4 Li2S04 Sn3(PO4)2

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