Polyatomic Ions and Chromium Compounds

The video tutorial explains how to write the formula for Chromium(II) Sulfate. It begins by identifying the element symbol for Chromium and discusses its nature as a transition metal with a 2+ charge. The tutorial then covers the sulfate ion, a polyatomic ion with a 2- charge, and emphasizes the importance of memorizing it. The video explains the formation of ionic compounds, highlighting the need for charges to balance to zero. Finally, the formula for Chromium(II) Sulfate is presented as CrSO4, concluding the tutorial.

What is the charge on the chromium ion in chromium 2 sulfate?

• 1+

• 3+

• 2+

• 4+

Which of the following is a polyatomic ion?

• Cl-

• Na+

• SO4 2-

• O2-

Why is it recommended to memorize the sulfate ion?

• It is not found in any chemical reactions.

• It is only used in advanced chemistry.

• It is a common ion encountered in chemistry.

• It is rarely used in chemistry.

What is the net charge required for the ionic compound chromium 2 sulfate?

• 1+

• 0

• 2-

• 2+

What is the correct formula for chromium 2 sulfate?

• Cr2(SO4)3

• CrSO4 2-

• Cr(SO4)2

• CrSO4