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Warm Up

Warm Up. What is the charge of a cation ? negative or positive How are cations formed? What is the charge of an anion? negative or positive How are anions formed?. State the number of electrons gained or lost in forming the following ions:. Mg 2+ Rb 1+ Br - Al 3+.

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Warm Up

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  1. Warm Up • What is the charge of a cation? negative or positive • How are cations formed? • What is the charge of an anion? negative or positive • How are anions formed?

  2. State the number of electrons gained or lost in forming the following ions: Mg2+ Rb1+ Br- Al3+

  3. State the number of electrons gained or lost in forming the following ions: Mg2+ Lost 2 electrons Rb1+Lost 1 electrons Br- Gained 1 electron Al3+ Lost 3 electrons

  4. Write the formula unit (element symbol and charge) for the following ions: • Sodium ion • Bromide • Sulfide • Barium ion

  5. Write the formula unit (element symbol and charge) for the following ions: • Sodium ion Na+ • Bromide Br- • Sulfide S2- • Barium ion Ba2+

  6. 6.4Writing Chemical Formulas

  7. Binary Ionic compounds (2 elements) Chemical Formula Rule: • Identify ion symbols and charges • Write cation symbol 1st followed by the anion symbol 3. Balance charge (“cross multiplication”) Example: Write the formula for sodium chloride. Na+ and Cl- NaCl

  8. Na+ O2- Formula: Na2O Na+ Na+ O2- *** You do not need to write a 1, if the subscript is not present you assume it is one!!

  9. Trick for balancing “cross multiply” Ca2+ Cl- Ca Cl2 Ca2+ Cl- Cl-

  10. Naming the ionic compound when given a formula • Cation full name followed by the anion(-ide ending)

  11. Naming: Cation + anion-ide Example: • CaCl2 Calcium chloride • NaCl Sodium Chloride When looking at the name, is the number of atoms indicated? How are you supposed to figure out the number of atoms???

  12. You try it! Li+ S2- Write the formula and name!

  13. You try it! Li+ S2- Write the formula and name! Li2S Lithium Sulfide

  14. The ions of calcium and sulfur form a binary ionic compound. Write the formula and name of this resulting compound:

  15. Calcium ion and Sulfide Write the formula and name of this resulting compound: CaS Calcium sulfide

  16. You try it! Write the ions, chemicalformula and chemical name of the ionic compound formed when potassium and oxygen ions interact. Ions: Chemical Formula: Chemical name:

  17. Write the ions, chemicalformula and chemical name of the ionic compound formed when potassium andoxygenions interact. Ions: K+ O2- Chemical Formula: K2O Chemical Name: Potassium oxide

  18. Ternary Compounds one ion is monatomic other is a polyatomic ion……. Example: Lead Nitrate Pb2+ and ( NO3- ) Formula: Pb (NO3)2

  19. You try it! Sodium hydrogen phosphate Na1+ HPO42- Write the formula:

  20. Sodium hydrogen phosphate Na1+ HPO42- Write the formula: Na2HPO4

  21. 6.3 and 6.4 In Class Practice

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