Ionic Compounds and Charge Balancing

The video tutorial explains how to write the formula for calcium iodide using the periodic table. It identifies calcium as a metal and iodine as a non-metal, forming an ionic compound. The tutorial discusses the importance of ionic charges, with calcium having a 2+ charge and iodine a 1- charge. To balance these charges, the crisscross method is used, resulting in the formula CaI2. The video concludes by verifying the formula, ensuring the net charge is zero, confirming the correctness of CaI2 as the formula for calcium iodide.

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

• Organic compound

• Metallic compound

• Ionic compound

• Covalent compound

What is the ionic charge of calcium?

• 1+

• 2+

• 1-

• 2-

What is the ionic charge of iodine?

• 2-

• 2+

• 1+

• 1-

What method is used to balance the charges in calcium iodide?

• Balancing method

• Substitution method

• Crisscross method

• Cross-multiplication method

In the crisscross method, what happens to the charges?

• They are added together

• They are subtracted

• They are ignored

• They are swapped as subscripts

What is the formula for calcium iodide?

• Ca2I

• Ca2I2

• CaI2

• CaI

How many iodine atoms are needed to balance the charge of one calcium atom?

• One

• Two

• Three

• Four

What is the net charge of the calcium iodide compound?

• 2+

• 1-

• 0

• 1+