Cobalt Compounds and Naming Rules

The video tutorial explains how to name the compound CoS2. It begins by identifying the elements involved: Cobalt, a transition metal, and Sulfur, a non-metal. The process involves writing the names as they appear on the periodic table, modifying the non-metal's name to end in 'ide', and considering the charge of the transition metal. Since Sulfur has a 2- charge and there are two sulfide ions, Cobalt must have a 4+ charge, leading to the name Cobalt(IV) Sulfide.

What type of metal is cobalt in the compound CoS2?

• Noble gas

• Alkaline earth metal

• Transition metal

• Alkali metal

What is the first step in naming the compound CoS2?

• Write the name of the metal as it appears on the periodic table

• Write the name of the non-metal

• Determine the number of atoms

• Identify the charge of the metal

How is the name of the non-metal modified in the compound CoS2?

• Add 'ite' to the end

• Add 'ide' to the end

• Add 'ium' to the end

• Add 'ate' to the end

Why is it necessary to consider the charge of cobalt in CoS2?

• Because sulfur is a noble gas

• Because sulfur is a transition metal

• Because cobalt is a transition metal

• Because cobalt is a non-metal

What is the charge of sulfur in the compound CoS2?

• 3-

• 2-

• 4-

• 1-

What is the full name of the compound CoS2?

• Cobalt(II) sulfide

• Cobalt(III) sulfide

• Cobalt(IV) sulfide

• Cobalt(V) sulfide