Mastering Ionic Compound Nomenclature with Polyatomic Ions

This video tutorial covers the naming of ionic compounds, particularly those with polyatomic ions. It explains the nature of polyatomic ions, how to identify them, and the process of naming compounds by using examples like aluminum hydroxide and ammonium dichromate. The tutorial also demonstrates how to derive chemical formulas from names by balancing charges, using examples such as potassium peroxide.

What is a polyatomic ion?

• A neutral molecule

• A molecule with a charge

• A single atom with a charge

• A molecule with no charge

What is the name of the compound Al(OH)3?

• Aluminum oxide

• Aluminum hydroxide

• Aluminum hydride

• Aluminum peroxide

In the compound NH4O, what is the name of NH4?

• Ammonium

• Nitrogen hydroxide

• Nitrogen oxide

• Ammonia

What is the correct name for the compound formed by NH4 and O?

• Ammonium oxide

• Ammonium oxygen

• Ammonium hydroxide

• Nitrogen oxide

What is the chemical formula for potassium peroxide?

• K2O

• K2O3

• KO2

• K2O2

How many valence electrons does potassium have?

• Two

• One

• Four

• Three

What is the charge of a peroxide ion?

• 1-

• 2-

• 1+

• 2+

What is the chemical formula for ammonium dichromate?

• NH4CrO4

• (NH4)2Cr2O7

• NH4Cr2O7

• (NH4)2CrO4

What is the charge of the dichromate ion?

• 1+

• 1-

• 2-

• 2+

Why is it important to use parentheses in the chemical formula for ammonium dichromate?

• To indicate the number of polyatomic ions

• To balance the equation

• To indicate the number of atoms

• To show the charge of the ions