Aluminum Ions and Carbonate Compounds

The video tutorial explains how to write the formula for aluminum carbonate. It begins by identifying aluminum on the periodic table and recognizing carbonate as a polyatomic ion. The tutorial then discusses the ionic nature of the compound, emphasizing the need to balance charges to achieve a neutral compound. The crisscross method is introduced as a technique to balance these charges, resulting in the correct formula for aluminum carbonate. The video concludes with a verification of the formula to ensure accuracy.

What is the symbol for aluminum on the periodic table?

• Au

• Am

• Al

• Ag

Which of the following is a polyatomic ion?

• Hydrogen

• Oxygen

• Carbonate

• Aluminum

What is the charge of an aluminum ion?

• 4+

• 3+

• 2+

• 1+

What is the charge of a carbonate ion?

• 2-

• 4-

• 1-

• 3-

Why do we need to balance the charges in an ionic compound?

• To make it more reactive

• To ensure it is a neutral compound

• To change its color

• To increase its mass

What method is used to balance the charges in aluminum carbonate?

• Addition method

• Substitution method

• Crisscross method

• Cross-multiplication

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

• 1

• 2

• 4

• 3

What is the total positive charge contributed by two aluminum ions?

• 3+

• 4+

• 5+

• 6+

What is the total negative charge contributed by three carbonate ions?

• 5-

• 7-

• 6-

• 4-

What is the final formula for aluminum carbonate?

• AlCO3

• Al2(CO3)3

• Al3(CO3)2

• Al(CO3)2