Ionic Charges and Chromate Compounds

The video tutorial explains how to write the formula for aluminum chromate. It begins by introducing the element aluminum and the polyatomic ion chromate, highlighting the need to balance ionic charges. The tutorial demonstrates using the crisscross method to balance the charges between aluminum and chromate ions, resulting in the formula Al2(CrO4)3. The video concludes by verifying the formula to ensure the charges are balanced, providing a clear understanding of the process.

What is the element symbol for aluminum?

• Ag

• Am

• Au

• Al

What type of ion is chromate?

• Monatomic ion

• Polyatomic ion

• Cation

• Anion

What is the ionic charge of aluminum?

• 2+

• 4+

• 1+

• 3+

What is the ionic charge of the chromate ion?

• 3-

• 2-

• 1-

• 4-

Which method is used to balance the charges in aluminum chromate?

• Addition method

• Crisscross method

• Multiplication method

• Substitution method

How many chromate ions are needed to balance the charge with two aluminum ions?

• 4

• 1

• 2

• 3

What is the correct formula for aluminum chromate?

• Al2(CrO4)3

• Al(CrO4)2

• Al3(CrO4)2

• Al(CrO4)3

What is the net charge of the aluminum chromate compound?

• 3+

• 0

• 2-

• 1+