1. Name covalent compounds. Name diatomic elements. When and why do we use parentheses in a chemical name? chemical formula? 02/06/2015

2. Junior Science Classes Physics (H)  Everyone AP Chemistry AP Biology AP Environmental Science Anatomy (R) Earth/Space Science (R) Environmental Science Forensics (H)

3. Naming Covalent Compounds All covalent compounds have 2 names. – First = first type of element in the symbol – Second = second type of element in the symbol Prefixes tell how many of each type of element is present

4. Naming Covalent Compounds CO 2 carbondioxide

5. Naming Covalent Compounds Steps – Write the name of the first element. – Add a prefix according to the subscript. EXCEPT: if the subscript is 1, don’t add a prefix – Write the name of the second element (change the ending to –ide) – Add a prefix according to the subscript.

6. Naming Covalent Compounds SubscriptPrefix 1mono- 2di- 3tri- 4tetra- 5penta-

7. Naming Covalent Compounds SubscriptPrefix 6hexa- 7hepta- 8octa- 9nona- 10deca-

8. EXAMPLES C 2 Cl 3 carbonchloridetridi

9. EXAMPLES CO 2 carbonoxidedi

10. EXAMPLES C O carbonoxidemon

11. EXAMPLES H 2 O hydrogenoxidedimon

12. Exceptions: Elemental Compounds Elements that exist is nature as diatomic covalent compounds Made of the same type of element Same name as the elements H-O-F-Br-I-N-Cl – H 2 O 2 F 2 Br 2 I 2 N 2 Cl 2