Chromium Compounds and Ions

The video tutorial explains how to write the formula for CR2(SO4)3 by identifying chromium as a transition metal and SO4 as a polyatomic ion. It details the process of naming the compound by first writing the metal's name, followed by the polyatomic ion's name. Since chromium is a transition metal, its charge must be specified using a Roman numeral. The tutorial calculates the charge of chromium to be 3+, resulting in the compound name chromium(III) sulfate.

What type of metal is chromium classified as?

• Alkali metal

• Transition metal

• Noble gas

• Alkaline earth metal

What is the name of the polyatomic ion SO4?

• Sulfate

• Carbonate

• Nitrate

• Phosphate

Why is it necessary to include a Roman numeral in the name of Chromium(III) Sulfate?

• To specify the charge of the chromium ion

• To show the charge of the sulfate ion

• To denote the number of chromium atoms

• To indicate the number of sulfate ions

What is the overall charge of the sulfate ion in the compound?

• 4-

• 3-

• 2-

• 1-

How many sulfate ions are present in the formula Cr2(SO4)3?

• One

• Four

• Three

• Two

What is the correct name for the compound Cr2(SO4)3?

• Chromium Sulfate

• Chromium(III) Sulfate

• Chromium(IV) Sulfate

• Chromium(II) Sulfate

What is the charge of each chromium ion in Cr2(SO4)3?

• 3+

• 1+

• 4+

• 2+