Compound names and formulas

Compound names and formulas

Mrs. Nebzydoski

The Periodic Table will guide you when deciding if a compound is ionic or molecular.

Metals and Nonmetals

Metals and nonmetals combine to form ionic compounds

Nonmetals and Nonmetals

Two nonmetals form covalent bonds to make molecular compounds

Polyatomic Ions

Polyatomic ions are charged particles that contain nonmetals covalently bonded together to form cations or anions that take part in ionic bonding

Ionic Compounds

Ionic compounds consist of cations (+) and anions (-). The charges of the ions must cancel each other out in a the formula.

Writing Ionic formulas

*Always write the cation first and the anion second

*Use subscripts to cancel out the charges

Multiple Choice

What is the formula for Calcium Sulfide?

• CaS₂

• CaS

• CaSO₄

• SCa

Multiple Choice

What is the name of the following compound?

MgBr₂

• magnesium bromide

• magnesium bromine

• magnesium dibromide

• bromine magnesium

Polyatomic Ions

*When naming, polyatomic ions keep their name

*If you need more than one polyatomic ion to cancel out a charge, it must be put in parenthesis

Formulas with polyatomic ions

• In sodium phosphate only one PO₄ is needed so there are no parentheses

• In magnesium phospate and ammonium phosphate more than one polyatomic is needed so the parentheses are needed.

Multiple Choice

What is the correct name for the following compound?

Ca(NO₂)₂

• Calcium nitroxide

• calcium nitrite

• calcium nitrate

• calcium nitro dioxided

Multiple Choice

What is the correct formula for Lithium dichromate?

• LiCr₂O₇

• LiCrO₄

• Li₂Cr₂O₇

• Li₂CrO₄

Multiple Choice

Which is the correct formula for Aluminum perchlorate?

• Al(ClO)₃

• Al(ClO₂)₃

• Al(ClO₃)₃

• Al(ClO₄)₃

Molecular Compounds have covalent bonds

We name them using prefixes

Molecular prefixes

CO₂ is called carbon dioxide

N₂O₅ is called dinitrogen pentoxide

Multiple Choice

What is the formula for tetraphosphorous decasulfide?

• PS₁₀

• P₁₀S₄

• P₄S₁₀

• P₆S₅

Multiple Choice

What is the name of N₂O?

• nitrogen oxide

• dinitrogen monoxide

• nitrogen monoxide

• dinitrogen oxide

Now we practice....

• Go to pages 76 & 77 of your textbook

• Answer number 104, 101, and 99