Writing Chemical Formulas

Ionic compounds are written with

• cation (+ ion) first then anion (- ion)
• anion (- ion) first then cation (+ ion)
• either way is fine
• polyatomic ions first

Ba⁺², Br^-1

• BrBa
• Br₂Ba₂
• BaBr₂
• Br₂Ba

Tags

NGSS.MS-PS1-1

Ca⁺², O^-2

• CaO
• OCa
• Ca_-2O₊₂
• Ca₂O₂

Tags

NGSS.MS-PS1-1

Ca⁺²P^-3

• PCa
• P₂Ca₃
• CaP
• Ca₃P₂

Tags

NGSS.MS-PS1-1

K⁺, O^-2

• KO
• K₂O
• K_-2O₂
• O₂K

Tags

NGSS.HS-PS1-2

The name of FeCl₂ is

• iron chloride
• iron (II) chloride
• iron (I) chloride
• iron dichloride

When adding a subscript to a polyatomic ion, you should...

• multiply any subscripts on the polyatomic ion by the subscript you are adding
• put parentheses around the polyatomic ion before adding a subscript
• write the new subscript next to any subscripts on the polyatomic ion
• put the polyatomic ion in square brackets before adding the subscript

What is the correct name for HBr?

• Bromic acid
• Hydrobromic acid
• Hydrogen bromate
• Hypobromic acid

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

• share them
• donate them
• keep them and accept others
• keep them and give others

What is the correct name for P₃Cl₆?

• Potassium chloride
• Phosphorous chloride
• Triphosphorous hexachloride
• Tetraphosphorous heptachloride