Iron(II) Chromate and Polyatomic Ions

The video tutorial explains how to write the formula for Iron(II) Chromate. It begins by identifying the element symbol for iron and the significance of the Roman numeral indicating its charge. The tutorial then discusses the chromate ion, a polyatomic ion, and its ionic charge. It emphasizes the importance of balancing charges to achieve a neutral compound. The video also covers how to name compounds from given formulas and vice versa, ensuring a comprehensive understanding of the topic.

What does the Roman numeral II indicate in Iron(II) Chromate?

• The atomic number of iron

• The charge of the iron ion

• The number of iron atoms

• The number of chromate ions

Which of the following is a polyatomic ion?

• Fe

• O2

• H2O

• CrO4

What is the charge of the chromate ion?

• 2+

• 1-

• 2-

• 3+

How do the charges of iron and chromate ions combine in Iron(II) Chromate?

• They both have a charge of 2+

• Iron is 3+ and chromate is 3-

• They both have a charge of 2-

• Iron is 2+ and chromate is 2-

What is the correct formula for Iron(II) Chromate?

• Fe2(CrO4)3

• Fe2CrO4

• FeCrO3

• FeCrO4

If given the formula FeCrO4, how would you determine the charge of iron?

• By looking at the periodic table

• By checking the atomic mass

• By knowing the charge of chromate

• By counting the number of atoms