Ionic Compounds and Polyatomic Ions

The video tutorial explains how to write the formula for Cobalt 3 sulfate. It begins by identifying Cobalt as a transition metal with a 3+ charge. The sulfate ion, a polyatomic ion with a 2- charge, is introduced. The tutorial explains the formation of ionic compounds, emphasizing the need for a net charge of zero. The crisscross method is used to balance the charges, resulting in the formula CO2(SO4)3. The video concludes by verifying the formula's correctness.

What is the charge of Cobalt in Cobalt 3 sulfate?

• 4+

• 3+

• 2+

• 1+

Which of the following is a polyatomic ion?

• Hydrogen

• Oxygen

• Sulfate

• Cobalt

What is the charge of the sulfate ion?

• 4-

• 3-

• 2-

• 1-

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

• To make it dissolve in water

• To ensure the compound is stable

• To increase its weight

• To make it more colorful

What method is used to balance the charges in Cobalt 3 sulfate?

• Substitution method

• Addition method

• Crisscross method

• Cross-multiplication

How many sulfate ions are needed to balance the charge of two Cobalt ions?

• Three

• Two

• One

• Four

What is the final formula for Cobalt 3 sulfate?

• Co3(SO4)2

• Co2(SO4)3

• Co(SO4)2

• CoSO4

How do you verify the correctness of the formula for Cobalt 3 sulfate?

• By checking the color

• By ensuring the charges add up to zero

• By measuring its weight

• By tasting it