Ionic Compounds and Their Naming

This video tutorial explains how to name binary ionic compounds containing variable oxidation state cations. It covers the use of Roman numerals to indicate the charge on metal cations and provides examples with iron oxides, cobalt bromide, lead chloride, and chromium nitride. The video also includes practice problems to reinforce learning.

Why is it necessary to use Roman numerals when naming certain binary ionic compounds?

• To indicate the number of atoms in the compound

• To specify the charge on the metal cation

• To show the compound's molecular weight

• To denote the compound's color

What is the charge on iron in the compound FeO?

• +4

• +1

• +3

• +2

How do we determine the charge on iron in Fe2O3?

• By guessing based on common charges

• By using the periodic table

• By ensuring the compound is electrically neutral

• By measuring the compound's mass

What is the name of the compound with the formula CoBr2?

• Cobalt bromide

• Cobalt(II) bromide

• Cobalt(III) bromide

• Cobalt(IV) bromide

What does the Roman numeral IV indicate in the name lead(IV) chloride?

• The number of lead atoms

• The number of chloride ions

• The charge on the lead ion

• The compound's molecular weight

In the compound chromium(II) nitride, why are three cations needed?

• To increase the compound's stability

• To make the compound heavier

• To change the compound's color

• To balance the charge with two nitride ions

What is the formula for chromium(II) nitride?

• CrN2

• Cr3N2

• Cr2N3

• CrN

What is the correct name for the compound with the formula FeCl3?

• Iron chloride

• Iron(II) chloride

• Iron(III) chloride

• Iron(IV) chloride

What is the formula for lead(II) oxide?

• PbO

• PbO2

• Pb2O

• Pb2O3

Why is it important to ensure compounds are electrically neutral?

• To maintain the compound's color

• To ensure stability and correct naming

• To increase the compound's weight

• To make the compound more reactive