Mixed Compounds - Names to Formulas

What is the correct formula for
calcium phosphate?

• CaPO₄

• Ca₂(PO₄)₃

• Ca₃PO₄

• Ca₃(PO₄)₂

Answer explanation

Calcium is a metal so use the rules for ionic compounds.

What is the correct formula for 
phosphorus trichloride?

• KCl₃

• PCl₃

• K₃Cl

• P₃Cl

Answer explanation

No metal or ammonium in the compound so use the rules for molecular compounds.

What is the correct formula for

barium hydroxide?

• Ba(OH)₂

• BaOH₂

• BaOH

• Ba₂OH

Answer explanation

Barium is a metal so use the rules for ionic compounds.

What is the correct formula for 
silicon dioxide?

• SO₂

• NaO₂

• SiO₂

• SiO

Answer explanation

No metal or ammonium in the compound so use the rules for molecular compounds.

Tags

NGSS.MS-PS1-1

What is the correct formula for 
copper(II) chloride?

• CuCl₂

• CuCl

• Cu₂Cl

• Cu₂Cl₂

Answer explanation

Copper is a metal so use the rules for ionic compounds.

What is the correct formula for 
octanitrogen tetroxide?

• N₈O₃

• N₇O₃

• N₈O₃

• N₈O₄

Answer explanation

No metal or ammonium in the compound so use the rules for molecular compounds.

What is the correct formula for
diphosphorus pentoxide?

• P₂O₅

• PO₅

• P₅O₂

• P₂O₆

Answer explanation

No metal or ammonium in the compound so use the rules for molecular compounds.

What is the correct formula for 
trisilicon tetranitride?

• Si₃N₅

• Si₃N₄

• Si₃(NO₂)₄

• Si₃(NO₂)₅

Answer explanation

No metal or ammonium in the compound so use the rules for molecular compounds.

What is the correct formula for
zinc sulfate?

• ZnSO₃

• ZnSO₄

• ZnS

• Zn(SO₄)₂

Answer explanation

Zinc is a metal so use the rules for ionic compounds.

What is the correct formula for
iron(II) oxide?

• FeO

• FeO₂

• Fe₂O

• Fe₂O₂

Answer explanation

Iron is a metal so use the rules for ionic compounds.