Dichromate Ion and Lead Compounds

The video tutorial explains how to write the chemical formula for lead(IV) dichromate. It begins by identifying the element symbol for lead and the significance of the Roman numeral IV, indicating a 4+ charge. The dichromate ion, a polyatomic ion with a 2- charge, is introduced. The tutorial explains the need for charge balancing in ionic compounds, leading to the formula Pb(Cr2O7)2, ensuring a net charge of zero. The video concludes with a recap of the formula and its components.

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

• The number of lead atoms

• The charge of the lead ion

• The total charge of the compound

• The number of dichromate ions

Which of the following is a characteristic of a polyatomic ion?

• It consists of a single element

• It is always a metal

• It is found on the periodic table

• It has a specific ionic charge

What is the chemical formula for the dichromate ion?

• CrO3

• Cr2O7

• Cr2O4

• CrO4

Why must the charges in lead(IV) dichromate add up to zero?

• Because it is a metal

• Because it is a neutral compound

• Because it is a nonmetal

• Because it is a polyatomic ion

What is the charge of the dichromate ion?

• 1-

• 2-

• 4-

• 3-

How many dichromate ions are needed to balance the charge of one lead(IV) ion?

• Two

• One

• Three

• Four

What is the final chemical formula for lead(IV) dichromate?

• Pb(Cr2O7)2

• Pb2(Cr2O7)

• Pb(CrO4)2

• Pb2(CrO4)

What is the net charge of the lead(IV) dichromate compound?

• 2+

• 0

• 2-

• 4+