Iron III Iodide and Ionic Compounds

The video tutorial explains how to write the formula for Iron III Iodide by identifying the element symbols for iron (Fe) and iodine (I) from the periodic table. It describes the formation of ionic compounds between metals and non-metals, emphasizing the importance of balancing charges. The tutorial introduces the crisscross method to adjust subscripts and achieve a net charge of zero. Finally, it verifies the formula FeI3, ensuring the charges are balanced, and concludes with a summary of the process.

What is the symbol for iron on the periodic table?

• I

• Fe

• In

• Ir

Which type of compound is formed when a metal and a non-metal combine?

• Hydrogen

• Metallic

• Ionic

• Covalent

What is the ionic charge of iron in Iron III Iodide?

• 4+

• 3+

• 2+

• 1+

What is the charge of iodine when it forms an ion?

• 3-

• 4-

• 2-

• 1-

Which method is used to balance the charges in Iron III Iodide?

• Elimination

• Substitution

• Crisscross

• Cross-multiplication

In the crisscross method, what happens to the charges?

• They are swapped

• They are subtracted

• They are ignored

• They are added

How many iodine ions are needed to balance one iron ion in Iron III Iodide?

• 1

• 4

• 2

• 3

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

• 1+

• 0

• 1-

• 2-

What is the final chemical formula for Iron III Iodide?

• FeI

• Fe3I

• FeI2

• FeI3