1. Binary Molecular Nomenclature Rules
“Love”, Robert Indiana, American, 1970

2. Before we begin, I just wanted to take time to let you know about a substance that is quietly destroying the environment and disrupting world economies yet nothing is being done about it: dihydrogen monoxide (DHMO.)

3. FACTS:
In a study between 2005 and 2009, 3533 people died from Dihydrogen Monoxide (DHMO) inhalation during recreational use in the U.S.
DHMO is the 3rd leading cause of unintentional injury-related deaths worldwide, accounting for 7% of all injury- related deaths. (388,000 annually)
Please click on this link for more info:

4. When I return from my absence, I will have a petition that hopefully we can all get behind in order to ban this dangerous substance. OK. Now on to the lesson…

5. Binary Molecular (2 nonmetals)
Name the least electronegative element first.
Change the last syllable of the second element to “-ide”.
Add appropriate prefix to element name to indicate the number of atoms of each element present.

6. Binary Molecular Prefixes
1-mon(o)
2-di
3-tri
4-tetr(a)
5-pent(a)
6-hex(a)
7-hept(a)
8-oct(a)
9-non(a)
10-dec(a)

7. Binary Molecular Prefixes
6-hex(a)
7-hept(a)
8-oct(a)
9-non(a)
10-dec(a)
1-mon(o)
2-di
3-tri
4-tetr(a)
5-pent(a)
Notice that the vowels at the end of each prefix (except for di- and tri-) are in parentheses. This is because sometimes you use the vowel and sometimes not. The general rule is: use the vowel if used with an element that starts with a consonant (e.g., tetrafluoride); don’t use the vowel if used with an element that starts with a vowel (e.g., tetroxide).

8. Binary Molecular Prefixes
DO NOT USE MONO ON FIRST ELEMENT!!!

9. Name the following compound:
Practice 1
Name the following compound:
N2O
dinitrogen monoxide

10. Name the following compound:
Practice 2
Name the following compound:
CS2
carbon disulfide

11. Name the following compound:
Practice 3
Name the following compound:
SF6
sulfur hexafluoride

12. Name the following compound: P2O4 diphosphorus tetroxide
Practice 4
Name the following compound:
P2O4
diphosphorus tetroxide

13. That’s it!
Now do some practice on your own. The answers to the assignment are on my website (on today’s agenda) on the last page of the link to the assignment. Good luck!