Ionic Compounds and Chemical Formulas

The video tutorial explains how to write the formula for aluminum oxide by identifying it as an ionic compound due to the presence of a metal and a non-metal. It details the process of determining the ionic charges of aluminum and oxygen using the periodic table, balancing the chemical equation by adjusting subscripts, and verifying the formula using the crisscross method. The tutorial concludes with a summary and directs viewers to additional resources for further practice.

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

• Hydrogen

• Covalent

• Metallic

• Ionic

What is the charge of aluminum when it forms an ionic compound?

• +4

• +3

• +2

• +1

What is the charge of oxygen in an ionic compound?

• -4

• -1

• -2

• -3

How do you balance the charges in the formula for aluminum oxide?

• By adding more aluminum atoms

• By adjusting the subscripts to neutralize the charges

• By adding more oxygen atoms

• By changing the charges of the ions

What is the balanced chemical formula for aluminum oxide?

• Al2O3

• AlO2

• Al2O

• AlO

What method can be used to verify the balanced formula of an ionic compound?

• Reverse method

• Double-check method

• Crisscross method

• Cross-check method

In the crisscross method, what do you do with the charges?

• Subtract them

• Add them together

• Cross them over to the opposite element

• Ignore them

What is the purpose of the crisscross method?

• To find the molecular weight

• To balance the chemical equation

• To determine the type of bond

• To verify the correct formula of an ionic compound

Why is it important to balance the charges in a chemical formula?

• To increase the compound's weight

• To change the compound's color

• To make the compound more reactive

• To ensure the compound is stable

Where can you find additional resources for naming and writing chemical formulas?

• In a physics journal

• In a science magazine

• On the Namor website

• In a chemistry textbook