Naming and Charges of Ionic Compounds

The video tutorial explains how to name the compound CR3(PO4)2. It begins by identifying the components: chromium, a transition metal, and the phosphate ion, a polyatomic ion. The tutorial then details the process of determining the ionic charge of chromium by balancing the charges of the phosphate ions. Finally, it demonstrates how to write the compound's name, 'chromium(II) phosphate,' using Roman numerals to indicate the charge of the chromium ions.

What is the polyatomic ion present in Cr3(PO4)2?

• Sulfate

• Phosphate

• Carbonate

• Nitrate

How many phosphate ions are bonded to the chromium atoms in Cr3(PO4)2?

• Four

• Three

• Two

• One

How many chromium atoms are present in Cr3(PO4)2?

• One

• Two

• Three

• Four

What is the first step in naming Cr3(PO4)2?

• Determine the charge of chromium

• Identify the polyatomic ion

• Write the name of the metal

• Calculate the net charge

Why is it important to determine the ionic charge of chromium in Cr3(PO4)2?

• To balance the equation

• To use the correct Roman numeral

• To identify the polyatomic ion

• To find the number of atoms

What is the charge of the phosphate ion?

• 4-

• 1-

• 3-

• 2-

What is the total negative charge contributed by the phosphate ions in Cr3(PO4)2?

• 12-

• 9-

• 6-

• 3-

How do you represent the charge of chromium in the name of Cr3(PO4)2?

• With a suffix

• With a subscript

• With a prefix

• With a Roman numeral

What is the final name of the compound Cr3(PO4)2?

• Chromium Phosphate

• Chromium(III) Phosphate

• Chromium(II) Phosphate

• Chromium(IV) Phosphate