Naming and Charges of Cobalt Compounds

The video tutorial explains how to name the compound CO2S3. It begins by identifying cobalt as a transition metal and sulfur as a non-metal. The process involves writing the names as they appear on the periodic table, modifying the non-metal's suffix to 'ide', and determining the charge of the transition metal using the charge of sulfur. The final name, 'cobalt 3 sulfide', includes a Roman numeral to indicate the charge of cobalt. The tutorial also explains how to deduce the formula from the name.

What type of metal is cobalt in the compound CO2S3?

• Transition metal

• Alkali metal

• Alkaline earth metal

• Noble gas

What is the first step in naming the compound CO2S3?

• 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 do you modify the name of the non-metal in CO2S3?

• Keep it unchanged

• Add 'ate' to the end

• Replace the ending with 'ide'

• Add 'ite' to the end

Why is it necessary to include the charge of cobalt in the name of CO2S3?

• Because the compound is ionic

• Because cobalt is a non-metal

• Because sulfur has a variable charge

• Because cobalt is a transition metal

What is the charge of sulfur in the compound CO2S3?

• 1-

• 2-

• 3-

• 4-

How is the charge of cobalt represented in the name of CO2S3?

• With Arabic numerals

• With asterisks

• With Roman numerals

• With Greek letters

What is the final name of the compound CO2S3?

• Cobalt(V) Sulfide

• Cobalt(III) Sulfide

• Cobalt(II) Sulfide

• Cobalt(IV) Sulfide

If given the name Cobalt(III) Sulfide, what can you infer about the charge of cobalt?

• It is 1+

• It is 3+

• It is 2+

• It is 4+