Calcium Phosphate Chemical Formulas

Dr. B explains how to write the chemical formula for calcium phosphate, a ternary ionic compound. The process involves identifying calcium as a metal and phosphate as a group of nonmetals, then using the periodic table and a table of polyatomic ions to determine their charges. The crisscross method is used to balance these charges, ensuring the compound has a net charge of zero. The video concludes with a check of the formula and a call to action for further practice.

What is the main objective of the video presented by Dr. B?

• To discuss the history of chemistry

• To write the formula for calcium phosphate

• To explain the periodic table

• To demonstrate a chemical reaction

What type of compound is formed when a metal combines with a group of nonmetals?

• Ternary ionic compound

• Metallic compound

• Binary ionic compound

• Covalent compound

Which ion is represented by the formula PO4 3-?

• Sulfate ion

• Nitrate ion

• Carbonate ion

• Phosphate ion

What is the charge of a calcium ion as found on the periodic table?

• +1

• +2

• -1

• -2

Why is it necessary to balance the charges when writing the formula for an ionic compound?

• To increase the compound's weight

• To make the compound colorful

• To make the compound reactive

• To ensure the compound is stable

What method is used to balance the charges in the formula for calcium phosphate?

• Crisscross method

• Cross-multiplication method

• Substitution method

• Addition method

In the crisscross method, what is done with the charges of the ions?

• They are added together

• They are swapped and used as subscripts

• They are multiplied by each other

• They are ignored

What should be the net charge of a correctly written ionic compound?

• 0

• +1

• +2

• -1

How do you verify that the chemical formula for calcium phosphate is correct?

• By checking the color of the compound

• By measuring the compound's mass

• By testing the compound's solubility

• By ensuring the net charge is zero

What is the final chemical formula for calcium phosphate?

• Ca(PO4)2

• Ca3(PO4)2

• Ca2(PO4)3

• CaPO4