Iron III Phosphate and Polyatomic Ions

The video tutorial explains how to write the chemical formula for iron III phosphate. It begins by identifying iron on the periodic table and recognizing phosphate as a polyatomic ion. The tutorial emphasizes the ionic nature of the compound, requiring charge balancing between iron's 3+ charge and phosphate's 3- charge. The final formula, FePO4, is presented after ensuring the charges balance to zero.

What is the element symbol for iron as found on the periodic table?

• Fe

• In

• Ir

• I

Which of the following is a polyatomic ion that ends in 'ate'?

• Phosphate

• Oxide

• Chloride

• Sulfide

What is the charge of the phosphate ion in Iron III Phosphate?

• 4-

• 1-

• 3-

• 2-

What does the Roman numeral III indicate in Iron III Phosphate?

• The charge of the iron ion

• The number of iron atoms

• The atomic number of iron

• The number of phosphate ions

How do the charges of iron and phosphate ions combine in Iron III Phosphate?

• They add up to zero

• They both are negative

• They multiply to zero

• They both are positive

What is the correct chemical formula for Iron III Phosphate?

• Fe2(PO4)3

• FePO4

• Fe3(PO4)2

• FePO3