Naming and Deducing Ionic Compound Formulae

This video tutorial covers the naming and formula deduction of ionic compounds, focusing on polyatomic ions. It begins with a review of monatomic ions and introduces polyatomic ions, such as hydroxide, sulfate, and nitrate. The tutorial provides examples, including sodium nitrate and magnesium hydroxide, demonstrating the crisscross method for balancing charges. It emphasizes the importance of using brackets in formulas and offers a practice problem with potassium sulfate. The video concludes with a discussion on transition metals, highlighting the need to specify valency using Roman numerals.

What is a monatomic ion?

• An ion made of one atom

• An ion made of multiple atoms

• A neutral molecule

• A compound with no charge

Which of the following is a polyatomic ion?

• Hydroxide ion

• Magnesium ion

• Sodium ion

• Chloride ion

What is the charge of the sulfate ion?

• -1

• -2

• +1

• +2

What is the correct formula for sodium nitrate?

• Na2NO3

• Na2N

• NaNO2

• NaNO3

How do you name an ionic compound made from polyatomic ions?

• By using the names of the ions as they are

• By using the Latin name of the metal

• By adding a prefix to the name

• By changing the suffix to -ide

What is the correct formula for magnesium hydroxide?

• MgOH

• MgOH2

• Mg(OH)2

• Mg2OH

Why do we use brackets in the formula for magnesium hydroxide?

• To indicate the number of magnesium ions

• To separate the elements

• To show the structure of the hydroxide ion

• To balance the charge of the compound

What is the formula for the ionic compound formed from potassium and sulfate ions?

• K2S

• KSO4

• KSO3

• K2SO4

What does it mean when a transition metal is multivalent?

• It can only form one type of ion

• It can form ions with multiple charges

• It does not form ions

• It is always neutral

How do you specify the valency of a transition metal in the name of an ionic compound?

• By using a prefix

• By using a suffix

• By writing the valency as Roman numerals in round brackets

• By using the Latin name of the metal