Lead(II) Phosphate and Ionic Compounds

The video tutorial explains how to write the chemical formula for lead(II) phosphate. It begins by identifying lead and phosphate ions, noting that lead is a metal with a 2+ charge and phosphate is a polyatomic ion with a 3- charge. The tutorial uses the crisscross method to balance these charges, resulting in the formula Pb3(PO4)2. The video concludes by verifying the formula to ensure the net charge is zero.

What is the chemical symbol for lead?

• Pd

• Ld

• Le

• Pb

Which of the following is a polyatomic ion?

• Hydrogen

• Lead

• Phosphate

• Oxygen

What is the charge of the phosphate ion?

• 2+

• 3-

• 2-

• 3+

Why is lead(II) phosphate considered an ionic compound?

• It is made of metals only

• It is made of gases

• It is made of a metal and non-metals

• It is made of non-metals only

What does the Roman numeral in lead(II) indicate?

• The atomic number of lead

• The number of phosphate ions

• The charge of the lead ion

• The number of lead atoms

What method is used to balance the charges in lead(II) phosphate?

• Substitution method

• Crisscross method

• Multiplication method

• Addition method

How many phosphate ions are needed to balance the charge with three lead ions?

• Three

• Two

• One

• Four

What is the total positive charge contributed by three lead ions?

• 3+

• 5+

• 6+

• 4+

What is the net charge of a correctly balanced lead(II) phosphate compound?

• 1-

• 1+

• 0

• 2-

What is the final chemical formula for lead(II) phosphate?

• Pb3(PO4)3

• Pb2(PO4)3

• Pb3(PO4)2

• Pb(PO4)2