The video tutorial explains how to determine the chemical formula for lithium oxide. It begins by identifying lithium and oxygen on the periodic table and recognizing that they form an ionic compound. The tutorial then demonstrates how to balance the charges of lithium (+1) and oxygen (-2) to achieve a net charge of zero, resulting in the formula Li2O. The crisscross method is introduced as a way to verify the formula, ensuring the correct subscripts are used. The video concludes with a summary of the process and the final formula for lithium oxide.

What type of compound is formed when lithium and oxygen combine?

• Ionic compound

• Covalent compound

• Molecular compound

• Metallic compound

What is the charge of a lithium ion?

• -1

• +1

• +2

• -2

How many lithium ions are needed to balance the charge of one oxide ion?

• Three

• One

• Two

• Four

What is the correct chemical formula for lithium oxide?

• LiO2

• LiO

• Li2O2

• Li2O

In the crisscross method, what happens to the subscript of the oxygen?

• It becomes 2

• It becomes 1

• It is removed

• It becomes 3

What is the purpose of the crisscross method in forming ionic compounds?

• To balance the charges

• To determine the molecular weight

• To find the atomic number

• To calculate the density