Calcium Compounds and Ions

The video tutorial explains how to write the formula for calcium bicarbonate, also known as calcium hydrogen carbonate. It begins by identifying calcium on the periodic table and finding the bicarbonate ion in a table of common polyatomic ions. The tutorial discusses the ionic charges of calcium and bicarbonate, emphasizing the need for the charges to balance to zero. The crisscross method is used to determine the correct formula, and the video concludes by verifying the formula and ensuring the net charge is zero.

What is the element symbol for calcium on the periodic table?

• Co

• Cl

• C

• Ca

Which of the following is a polyatomic ion?

• Ca

• HCO3-

• O2

• Na+

What is the charge of the bicarbonate ion?

• 1-

• 1+

• 2+

• 3-

What is the charge of calcium when it forms an ion?

• 1-

• 2+

• 1+

• 3+

What method is used to balance the charges in ionic compounds?

• Substitution

• Addition

• Crisscross method

• Cross-multiplication

How many bicarbonate ions are needed to balance the charge of one calcium ion?

• Three

• Two

• Four

• One

What is the correct formula for calcium bicarbonate?

• CaHCO3

• Ca(HCO3)2

• Ca2HCO3

• Ca(HCO3)3

Why do we use parentheses in the formula for calcium bicarbonate?

• To indicate a single ion

• To show multiple polyatomic ions

• To denote a charge

• To separate different elements

What is the net charge of the calcium bicarbonate compound?

• 1+

• 2-

• 0

• 3+

What is another name for calcium bicarbonate?

• Calcium hydrogen carbonate

• Calcium carbonate

• Calcium sulfate

• Calcium oxide