Polyatomic Ions and Ternary Compounds

This video tutorial covers the naming and formula writing for ternary ionic compounds. It begins with an introduction to polyatomic ions, explaining their definition and providing examples. The video then outlines the rules for writing formulas for ionic compounds, including the use of parentheses for multiple polyatomic ions. Several examples are provided, such as sodium sulfate and calcium phosphate, to illustrate the process. The tutorial includes practice problems for viewers to solve independently, followed by solutions. The video concludes with rules and examples for naming polyatomic compounds, emphasizing the importance of not altering the names of cations or polyatomic ions.

What is a polyatomic ion?

• A single atom with a charge

• A charged group of two or more bonded atoms

• A molecule with no charge

• A neutral group of atoms

When writing formulas for ternary ionic compounds, which ion is written first?

• Anion

• Cation

• Neutral atom

• Polyatomic ion

Why do we use parentheses in formulas with multiple polyatomic ions?

• To avoid confusion with subscripts

• To indicate a charge

• To show the compound is neutral

• To separate different elements

How many sodium ions are needed to balance the charge of one sulfate ion?

• Four

• Three

• Two

• One

What is the least common multiple of the charges for calcium and phosphate ions?

• 3

• 2

• 6

• 4

How many hydroxide ions are needed to balance the charge of one aluminum ion?

• One

• Two

• Four

• Three

What is the charge of ammonium ion?

• +1

• -1

• -2

• +2

What is the first rule in naming ternary ionic compounds?

• The compound is named alphabetically

• The polyatomic ion is named first

• The cation is named first

• The anion is named first

What is the name of the compound with the formula NaNO3?

• Sodium nitrite

• Sodium phosphate

• Sodium nitrate

• Sodium sulfate

What is the name of the compound with the formula NH4OH?

• Ammonium oxide

• Ammonium hydroxide

• Ammonium hydride

• Ammonium chloride