2. Writing Formulas for Covalent (Molecular) Compounds
Write the elemental symbols for the two elements
Use the prefix to determine the subscripts for each element

3. 1- mono 2- di 3- tri 4- tetra 5- penta
Greek Prefixes
1- mono 2- di 3- tri 4- tetra 5- penta
6- hexa 7- hepta 8- octa 9- nona 10- deca

4. Let’s Try a Few Carbon Dioxide Dinitrogen pentaoxide
Diphosphorus trichloride

5. Major Classes of Compounds
Ionic compounds.
Metal + nonmetal(s).
Metal first in formula.
Binary ionic or compounds with polyatomic ions.
Molecular compounds.
2 or more nonmetals.
Binary molecular (or binary covalent).
2 nonmetals.
Acids—Formula starts with H.
Though acids are molecular, they behave as ionic when dissolved in water.
May be binary or oxyacid.

6. Classifying Compounds
Compounds containing a metal and a nonmetal = Binary ionic
Type I and II
Compounds containing a polyatomic ion = Ionic with polyatomic ion
Compounds containing two nonmetals = Binary molecular compounds.
Compounds containing H and a nonmetal = Binary acids.
Compounds containing H and a polyatomic ion = Oxyacids.

7. Type I Binary Ionic Compounds
Contain metal cation + nonmetal anion.
Metal listed first in formula and name.
Name metal cation first, name nonmetal anion second.
Cation name is the metal name.
Nonmetal anion named by changing the ending on the nonmetal name to –ide.
Tro's "Introductory Chemistry", Chapter 5

8. Lets try a few
KBr
MgCl2
CaO
LiBr

9. Type II Binary Ionic Compounds
Contain metal cation + nonmetal anion.
Metal listed first in formula and name.
Name metal cation first, name nonmetal anion second
Metal cation name is the metal name followed by a roman numeral in parentheses to indicate its charge
Determine charge from anion charge
Nonmetal anion named by changing the ending on the nonmetal name to –ide.
Tro's "Introductory Chemistry", Chapter 5

10. Practice─Name the Following Compounds.
TiCl4
PbBr2
Fe2S3

11. Naming Ionic Compounds (Ternary)
Metal and a polyatomic ion
Name the metal
Name the polyatomic ion
** DO NOT CHANGE THE ENDING!!!!

12. Let’s Try a Few
KNO3
Mg(OH)2
NH4NO3

13. Covalent (Molecular) Compounds
Remember its formed from two nonmetals
Name the two elements
Add –ide to the end of the second element
Add prefixes to the elements that represent the number of atoms in the molecule

14. Lets Try a Few
CCl4
BCl3
SF6 CO