Ionic Charges and Compound Formulas

The video tutorial explains how to determine the name of a compound that requires Roman numerals. It focuses on elements like lead, copper, tin, and iron, which form multiple ions. The tutorial provides examples, such as CuCl2 and lead phosphate, to illustrate the process of identifying the correct Roman numeral based on the charges of the ions involved. The video emphasizes the importance of understanding the charges of common ions and how to apply this knowledge to name compounds accurately.

Which of the following elements requires Roman numerals when naming its compounds?

• Sodium

• Lead

• Calcium

• Potassium

What is the charge of the copper ion in CuCl2?

• +1

• +2

• +3

• +4

How many chloride ions are present in the formula CuCl2?

• 1

• 2

• 4

• 3

What is the charge of chloride ions?

• +2

• +1

• -2

• -1

In the compound CuCl2, what must the total charge of copper and chloride ions add up to?

• +2

• -1

• +1

• 0

What is the charge of phosphate ions?

• -2

• -3

• -1

• -4

How many lead ions are present in the formula for lead phosphate?

• 1

• 2

• 3

• 4

What is the total negative charge contributed by phosphate ions in lead phosphate?

• -12

• -9

• -6

• -15

In lead phosphate, what is the charge of each lead ion?

• +5

• +2

• +3

• +4

What is the Roman numeral used for lead in lead phosphate?

• IV

• V

• II

• III