Iron III Nitrate and Polyatomic Ions

The video tutorial explains how to write the formula for iron III nitrate. It begins by identifying iron and nitrate, noting that nitrate is a polyatomic ion. The tutorial discusses the charges of iron and nitrate ions, emphasizing the need for a neutral compound. The crisscross method is introduced to balance the charges, and the importance of verifying the formula is highlighted. The tutorial concludes with a clean presentation of the correct formula for iron III nitrate.

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

• Fe

• I

• Ir

• In

Which of the following is a polyatomic ion?

• H2

• NO3

• Cl

• O2

What is the charge of the nitrate ion?

• 3+

• 2-

• 1+

• 1-

What charge does iron have in Iron III Nitrate?

• 1+

• 2+

• 4+

• 3+

Why do the charges of iron and nitrate need to add up to zero?

• To decrease solubility

• To increase reactivity

• To create a neutral compound

• To form a stable compound

What method is used to balance the charges in Iron III Nitrate?

• Addition method

• Substitution method

• Crisscross method

• Cross-multiplication method

Why are parentheses used around the nitrate ion in the formula?

• To highlight its charge

• To separate it from iron

• To show multiple ions

• To indicate a single ion

What is the final formula for Iron III Nitrate?

• Fe(NO3)3

• FeN3O9

• Fe(NO3)2

• Fe3(NO3)

How many nitrate ions are needed to balance the charge of one iron ion in Iron III Nitrate?

• Four

• Three

• Two

• One

What is the net charge of the compound Iron III Nitrate?

• 1+

• 3+

• 0

• 2-