Iron III Dichromate Concepts

The video tutorial explains how to write the formula for Iron(III) Dichromate. It begins by identifying the element symbol for iron and the significance of the Roman numeral III, indicating a 3+ charge. The dichromate ion is introduced as a polyatomic ion with a formula of Cr2O7 and a 2- charge. The tutorial emphasizes the need to balance these charges to achieve a net charge of zero, using a trick to swap and balance the charges. The final formula for Iron(III) Dichromate is derived as Fe2(Cr2O7)3, with an explanation of the need for parentheses around the dichromate ion. The video concludes with a summary of the process.

What is the element symbol for iron in the formula for Iron III Dichromate?

• I

• Ir

• Fe

• In

What is the charge of iron in Iron III Dichromate?

• 1+

• 2+

• 3+

• 4+

What is the formula for the dichromate ion?

• Cr2O7

• CrO7

• CrO4

• Cr2O4

What is the charge of the dichromate ion?

• 1-

• 4-

• 2-

• 3-

Why do the charges in an ionic compound need to add up to zero?

• To make the compound dissolve in water

• To make the compound colorful

• To make the compound stable

• To make the compound magnetic

What is the purpose of using parentheses in the formula for Iron III Dichromate?

• To indicate the number of dichromate ions

• To indicate the color of the compound

• To indicate the number of iron atoms

• To indicate the charge of the compound

What is the complete formula for Iron III Dichromate?

• Fe2(Cr2O7)3

• FeCr2O7

• Fe(Cr2O7)2

• Fe3(Cr2O7)2