Naming Compounds with Polyatomic Ions

The video tutorial explains the concept of polyatomic ions, which are ions composed of more than one atom. It covers two main approaches: naming compounds from given formulas and deriving formulas from given names. The tutorial provides step-by-step instructions on naming cations and anions, using examples like aluminum sulfate and ammonium chloride. It also explains how to convert compound names to formulas, emphasizing the importance of keeping polyatomic ions intact. The video concludes with complex examples, such as magnesium phosphate and aluminum phosphite, demonstrating the simplification of formulas.

What is a polyatomic ion?

• A neutral molecule

• An ion with more than one atom

• A single atom with a charge

• An ion with only one atom

What is the first step in naming a compound from its formula?

• Balance the charges

• Identify the cation

• Write the chemical symbols

• Identify the anion

What is the name of the compound with the formula Al2(SO4)3?

• Aluminum sulfide

• Aluminum sulfate

• Aluminum phosphate

• Aluminum sulfite

What is the name of the compound with the formula NH4Cl?

• Ammonium phosphite

• Ammonium chloride

• Ammonium chlorate

• Ammonium sulfate

What is the name of the compound with the formula (NH4)2SO4?

• Ammonium sulfite

• Ammonium sulfate

• Ammonium phosphate

• Ammonium nitrate

What is the first step in naming a compound from its given name?

• Identify the polyatomic ions

• Balance the charges

• Identify the chemical symbols and charges

• Write the chemical formula

What is the formula for lithium nitrate?

• LiN3

• LiN

• LiNO3

• LiNO2

What is the formula for magnesium phosphate?

• Mg3(PO3)2

• Mg(PO4)2

• Mg2(PO4)3

• Mg3(PO4)2

What is the formula for aluminum phosphite?

• AlPO4

• Al3(PO3)2

• Al(PO3)3

• Al2(PO3)3

What should you remember about polyatomic ions when writing formulas?

• Their subscripts can be changed

• They can be split into individual atoms

• They do not affect the charge balance

• They must stay together