Iron II Phosphate Concepts

The video tutorial explains how to write the chemical formula for iron(II) phosphate. It begins by identifying iron and phosphate ions, highlighting the need to understand ionic charges. The tutorial introduces the crisscross method to balance charges and form the correct chemical formula. Finally, it verifies the formula to ensure a net charge of zero, concluding with the correct representation of iron(II) phosphate as Fe3(PO4)2.

What is the element symbol for iron?

• Ir

• I

• Fe

• In

Phosphate is classified as which type of ion?

• Anion

• Monatomic ion

• Cation

• Polyatomic ion

What is the charge of the phosphate ion?

• 3+

• 2+

• 3-

• 2-

What does the Roman numeral in iron II phosphate indicate?

• The number of iron atoms

• The atomic number of iron

• The charge of the iron ion

• The number of phosphate ions

What method is used to balance the charges in iron II phosphate?

• Balancing method

• Cross-multiplication

• Crisscross method

• Substitution method

Why do we use parentheses around the phosphate in the formula?

• To separate it from iron

• To show it is a metal

• To highlight its charge

• To indicate it is a polyatomic ion

How many phosphate ions are needed to balance the charge with three iron ions?

• Three

• Two

• One

• Four

What is the total negative charge contributed by two phosphate ions?

• 4-

• 3-

• 5-

• 6-

What is the final chemical formula for iron II phosphate?

• Fe3(PO4)2

• Fe2(PO4)3

• Fe(PO4)2

• Fe3(PO4)3

What is the net charge of the compound iron II phosphate?

• 3+

• 0

• 1+

• 2-