Lesson 2.5 - Covalent Bonds

             Learning Intention: 

What?  We are learning how to write the names and chemical formulas for covalent bonds.

Why? In order to use the International Union of Pure and Applied Chemistry (IUPAC) nomenclature correctly.

             Success Criteria

I can: 

-  Identify the properties of covalent bonds.

-Develop formulas for covalent bonds

- Identify the IUPAC nomenclature for covalent bonds when given a covalent compound formula

 Why does sharing e- make sense here?

Bond forms when atoms SHARE electrons. 

Covalent bonds are only between Nonmetals/Nonmetals  OR Nonmetals / Metalloids. 

WHY?

notice the # of lines.

notice the # of lines.

Example 1:       

Dinitrogen trioxide

Example 1:       

Dinitrogen trioxide

N   O                

2      3

Example 2:    N  H    

2       4

Example 2:    N  H    

                           Nitrogen  Hydrogen  Hydride

Dinitrogen  tetrahydride

2       4

Write Formula 

from a 

Covalent 

Name

BCl

3

1. Write names of elements in the same order as the formula. 

2. Add -ide to the  second element. 

3. Add the corresponding

prefix to both elements telling how many atoms of that element are in the formula. 

STEPS:

Boron Chlorine

Boron Chloride

Boron trichloride

No need for mono- on first element.