1. Notes #4: Naming Covalent Compounds
WCHS Chemistry
NEED PERIODIC TABLE & POLY ION SHEET
QUIZ THURSDAY

2. REVIEW: NAMING IONIC COMPOUNDS
Ionic bond = a bond formed by the attraction of oppositely charged ions (give or take e-)
Between a metal and a nonmetal
Total charge must equal zero!!!
Calcium Sulfide Magnesium Chloride

4. NAMING COVALENT COMPOUNDS
Covalent bond = a bond formed by the atoms sharing valence electrons
Between nonmetals
CO2

5. RULES: NAMING COVALENT COMPOUNDS
Write the name of the 1st element
Write the name of the 2nd element with -ide ending
Use prefixes to tell the number of atoms of each element
NOTE: Mono is NEVER used to name the FIRST element!
Sulfur dioxide
Dinitrogen hexafluoride
SO2
N2F6

6. ** No charges are needed!**
You must be able to go the other way!
** No charges are needed!**
Nitrogen trifluoride
NF3
Diphosphorous trisulfide
P2S3

7. Rule Breaker CO
Carbon monooxide?
Carbon monoxide
When the prefix puts 2 vowels together, drop the “a” or “o” at the end of the prefix!
The “i” at the end of “di-” and “tri-” is NEVER dropped!

8. diphosphorous pentoxide P2O5
When the prefix puts 2 vowels together, drop the “a” or “o” at the end of the prefix!
The “i” at the end of “di-” and “tri-” is NEVER dropped!
SO2
Sulfur dioxide
diphosphorous pentoxide
P2O5
NI3
Nitrogen triiodide