Strontium Phosphate and Ionic Charges

The video tutorial explains how to write the formula for strontium phosphate. It begins by identifying the element symbols for strontium and phosphate, noting that phosphate is a polyatomic ion. The tutorial then discusses the need to balance the charges between strontium, which has a 2+ charge, and phosphate, which has a 3- charge. The crisscross method is used to balance these charges, resulting in the formula Sr3(PO4)2. The video concludes by verifying the formula to ensure the net charge is zero.

What is the symbol for strontium as found on the periodic table?

• St

• Sr

• Sm

• Sn

Which of the following is a polyatomic ion not found on the periodic table?

• Sulfate

• Phosphate

• Nitrate

• Chloride

What is the ionic charge of strontium?

• 1+

• 2+

• 3+

• 4+

What is the charge of the phosphate ion?

• 1-

• 4-

• 2-

• 3-

Which method is used to balance the charges in strontium phosphate?

• Crisscross method

• Cross-multiplication

• Balancing method

• Substitution method

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

• One

• Two

• Three

• Four

What is the correct formula for strontium phosphate?

• SrP

• Sr2P3

• Sr3(PO4)2

• Sr(PO4)3

What is the net charge of the strontium phosphate compound?

• 3+

• 2-

• 1+

• 0