Calcium Compounds and Ionic Charges

The video tutorial explains how to write the chemical formula for calcium sulfate. It begins by identifying calcium and sulfate, noting that sulfate is a polyatomic ion with a charge of two minus. The tutorial emphasizes the importance of balancing charges in ionic compounds, as calcium has a charge of plus two. By ensuring the charges cancel out, the final formula for calcium sulfate is determined to be CaSO4. The video concludes with a brief thank you from Dr. B.

What is the chemical symbol for calcium?

• C

• Cu

• Cl

• Ca

Which of the following is a polyatomic ion with a charge of two minus?

• Carbonate

• Phosphate

• Sulfate

• Nitrate

Why is it important to balance charges in an ionic compound?

• To decrease the compound's melting point

• To increase the compound's weight

• To make the compound colorful

• To ensure the compound is stable

What charge does calcium have in an ionic compound?

• -2

• +2

• -1

• +1

What happens to the charges of calcium and sulfate in calcium sulfate?

• They cancel each other out

• They remain unbalanced

• They both become negative

• They both become positive

What is the final chemical formula for calcium sulfate?

• CaSO3

• CaSO4

• CaS

• CaO