Calcium Carbonate and Ion Charges

The video tutorial explains how to write the formula for calcium carbonate. It begins by identifying calcium and carbonate, noting that carbonate is a polyatomic ion with a charge of 2-. Calcium, a metal, has a 2+ charge. The tutorial explains that calcium carbonate is an ionic compound, requiring charge balancing. Since the charges of calcium and carbonate cancel each other out, the formula is derived as CaCO3.

What is the chemical symbol for calcium when writing the formula for calcium carbonate?

• Ca

• Co

• Cl

• C

Where should you look to find the formula for carbonate when writing the formula for calcium carbonate?

• Table of elements

• Periodic table

• Table of metals

• Table of polyatomic ions

What is the charge of the carbonate ion in calcium carbonate?

• 2+

• 1-

• 2-

• 1+

In which group of the periodic table is calcium found, and what is its charge?

• Group 4, 4+

• Group 3, 3+

• Group 2, 2+

• Group 1, 1+

What is the final formula for calcium carbonate after balancing the charges?

• CaCO2

• Ca3CO2

• Ca2CO3

• CaCO3