Ionic Compounds and Their Properties

The video tutorial explains how to write the formula for barium fluoride by identifying barium and fluoride on the periodic table. It discusses the nature of ionic compounds, focusing on the charges of barium and fluoride ions. The crisscross method is introduced to balance the charges and derive the correct formula, BaF2. The tutorial concludes by verifying the formula to ensure the net charge is zero, confirming the accuracy of the derived formula.

What is the chemical symbol for barium?

• Br

• Be

• Ba

• B

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

• Metallic

• Covalent

• Ionic

• Molecular

What is the ionic charge of barium?

• 2-

• 2+

• 1+

• 1-

What is the ionic charge of fluorine?

• 2-

• 1-

• 2+

• 1+

What method is used to balance the charges in an ionic compound?

• Cross-multiply

• Elimination

• Crisscross

• Substitution

In the crisscross method, what happens to the charge numbers?

• They are added together

• They are subtracted

• They are swapped and used as subscripts

• They are ignored

What is the correct formula for barium fluoride?

• BaF2

• Ba2F2

• BaF

• Ba2F

How many fluorine atoms are needed to balance the charge of one barium atom?

• Two

• One

• Four

• Three

What is the net charge of a correctly balanced ionic compound?

• Positive

• Negative

• Zero

• Variable