Bell ringer-Name or generate formulas for the following:GeS2 Scandium nitride

CaO Vanadium (V) ferrocyanide

{Covalent Bonds

Nomenclature

Covalents watch until 11:25 mark

BrightStorm Covalent naming

1. Identify the following as ionic or covalent-

2. Sodium chloride

3. Cl2

4. Dihydrogen monoxide

5. MgCl2

6. Germanium Carbide

7. CH4

Bellringer

Steps to naming Covalents1. Id metal, nonmetal (must not

have a metal)2. Write out element names, drop the ending off second one and replace with –ide3. Count how many of each

elementyou have.4. Place the prefix that corresponds to the number in front of the element name.

Special notes-• Don’t ever simplify covalents• When using tetra or penta with

an oxide drop the –a and just use -tetr or –pent

• When using mono- with an oxide drop the –o and just use mon-

• Don’t use mono- on the first word

List of prefixes-

# of element

s

prefix # of element

s

Prefix

1 mono 6 hexa2 di 7 hepta3 tri 8 octa4 tetra 9 nona5 penta 10 deca

Formula

N2F4

SiCl4

ClF3

SiO2

Dinitrogen tetrafluoride

Silicon tetrachloride

Chlorine trifluoride

Silicon dioxide

Covalent naming

Steps to writing covalent formulas1. Id metal, nonmetal (must not have

a metal)2. Write out symbols.3. Read prefix, place corresponding

number in the subscript position. If it is a mono-, leave blank don’t write the one in the subscript position.

4. Don’t simplify!

Carbon dioxide

Phosphorous triiodide

Sulfur dichloride

Nitrogen trifluoride

Dioxygen difluoride

CO2

PI3

SCl2

NF3

O2F2

Now it’s your turn. On the Nomenclature Worksheet, complete all problems.

Mixed Ionic/Covalent Problems is for homework due Friday!

Phosphorus = P4 Oxygen = O2

CH4 = methaneNitrogen = N2