Chemical Formulas and Ions

The video tutorial explains how to write the formula for ammonium dichromate, focusing on the ammonium and dichromate polyatomic ions. It covers the charges of these ions and how to balance them to form a neutral compound. The tutorial concludes with the final formula for ammonium dichromate, emphasizing its nature as an ionic compound.

What are the two polyatomic ions involved in the formula for ammonium dichromate?

• Ammonium and sulfate

• Ammonium and dichromate

• Nitrate and dichromate

• Sulfate and nitrate

What is the chemical formula for the ammonium ion?

• NH4-

• NH3

• NH4+

• NH2-

What charge does the ammonium ion carry?

• 2-

• 1+

• 1-

• 2+

What is the chemical formula for the dichromate ion?

• Cr2O7 2-

• CrO4

• CrO4 2-

• Cr2O7

What is the charge on the dichromate ion?

• 2-

• 1-

• 2+

• 1+

How many ammonium ions are needed to balance the charge of one dichromate ion?

• Three

• Four

• Two

• One

What type of compound is ammonium dichromate considered to be?

• Metallic

• Covalent

• Ionic

• Molecular