Balancing Ionic Compounds and Charges

The video tutorial explains how to write the formula for potassium oxide by using the periodic table to identify the elements and their charges. It describes the process of balancing charges in ionic compounds and introduces the crisscross method as a quick way to verify the formula. The correct formula for potassium oxide is determined to be K2O.

Which element is represented by the symbol 'K' on the periodic table?

• Oxygen

• Krypton

• Calcium

• Potassium

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

• Metallic

• Ionic

• Covalent

• Molecular

What is the charge of a potassium ion?

• +1

• -2

• -1

• +2

How do you balance the charges between potassium and oxygen to form potassium oxide?

• Change the subscripts to balance charges

• Add more potassium atoms

• Add more oxygen atoms

• Use a catalyst

What is the correct formula for potassium oxide after balancing the charges?

• K2O2

• KO2

• K2O

• KO

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

• Add them together

• Ignore them

• Use them as subscripts for the opposite ion

• Multiply them

What is the purpose of the crisscross method?

• To find the atomic mass

• To verify the chemical formula

• To determine the number of atoms

• To calculate the molecular weight