#5 Writing Formulas and Naming Compounds

All binary compounds must end in this suffix.

• -ite

• -ate

• -ide

• -ous

Under what conditions can you use prefixes to name a chemical formula?

• The formula contains a metal and nonmetal.

• The formula contains a metal and metal.

• The formula contains a nonmetal bonded with a nonmetal.

• You can always use prefixes when naming compounds.

Do you use prefixes to name this compound?

CaO

• yes

• no

Do you use prefixes to name this compound?

PBr₃

• yes

• no

Ba⁺², Br^-1

• BrBa
• Br₂Ba₂
• BaBr₂
• Br₂Ba

Ca⁺², O^-2

• CaO
• OCa
• Ca_-2O₊₂
• Ca₂O₂

K⁺, O^-2

• KO
• K₂O
• K_-2O₂
• O₂K

Ca⁺²P^-3

• PCa
• P₂Ca₃
• CaP
• Ca₃P₂

The correct chemical formula for magnesium phosphide is

• MgP

• Mg₂P₃

• Mg₃P₂

• Mn₃P₂

What do metals tend to do with their valence electrons when bonding with non-metals?

• share them with nonmetals

• the metals give the nonmetals their valence electrons

• keep them and accept more valence electrons

• keep them and give others more valence electrons