Ionic and Ammonium Compounds

The video tutorial explains how to name the compound NH4₂S, known as ammonium sulfide. It begins by identifying NH4 as the ammonium ion, a positive polyatomic ion with a 1+ charge. The tutorial then describes sulfur as the sulfide ion with a 2- charge. To balance the charges, two ammonium ions are needed for each sulfide ion, resulting in the formula NH4₂S. The video emphasizes the importance of memorizing the ammonium ion and understanding the charge balance in ionic compounds.

What is the charge of the ammonium ion?

• 2+

• 1+

• 1-

• 2-

Why is ammonium considered unique among polyatomic ions?

• It is one of the few positive polyatomic ions.

• It is the only polyatomic ion with a 0 charge.

• It is the only polyatomic ion with a 3+ charge.

• It is the only negative polyatomic ion.

What is the ionic charge of the sulfide ion?

• 2-

• 1-

• 2+

• 1+

How do you modify the name of sulfur when naming the compound NH4S?

• Add 'ite' to the end

• Add 'ium' to the end

• Add 'ide' to the end

• Add 'ate' to the end

What is the chemical formula for ammonium?

• NH4

• NH2

• NH5

• NH3

How many ammonium ions are needed to balance the charge of one sulfide ion?

• One

• Two

• Three

• Four

What is the name of the compound formed by NH4 and S?

• Ammonium sulfate

• Ammonium sulfide

• Ammonium sulfur

• Ammonium sulfite