Ionic Compounds and Sulfate Ions

The video tutorial explains how to write the formula for magnesium sulfate. It begins by identifying magnesium on the periodic table and recognizing its symbol as Mg. The tutorial then discusses sulfate, a polyatomic ion not found on the periodic table, and explains its charge as SO4 2-. The video describes the formation of ionic compounds, emphasizing the need for charge balance to achieve a net charge of zero. Magnesium, being in group two, has a 2+ charge, which balances with the 2- charge of sulfate. The tutorial concludes by presenting the formula for magnesium sulfate as MgSO4.

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

• Mn

• Ms

• Mg

• Ma

Which of the following is a polyatomic ion that needs to be looked up separately from the periodic table?

• Chloride

• Sulfate

• Nitride

• Oxide

What is the ionic charge of magnesium when it forms compounds?

• 2+

• 1-

• 2-

• 1+

What is the charge of the sulfate ion?

• 1+

• 2+

• 2-

• 1-

Why is it important to balance the charges in an ionic compound?

• To ensure the compound has a net charge of zero

• To make the compound dissolve in water

• To ensure the compound is stable

• To make the compound colorful

What is the correct chemical formula for magnesium sulfate?

• MgSO3

• Mg2SO4

• MgSO4

• MgS