Oxidation Numbers and Ionic Charges

The video tutorial explains how to determine the oxidation numbers for each element in ammonium sulfide (NH4)2S. It begins by discussing the neutral nature of the compound and then focuses on the ammonium ion, explaining that its oxidation numbers must add up to its ionic charge. The video demonstrates solving for nitrogen's oxidation number and confirms hydrogen's known value. It then shifts to the sulfide ion, detailing sulfur's typical ionic charge and its oxidation number. The tutorial concludes by summarizing the oxidation numbers for all elements in the compound.

What is the overall charge of ammonium sulfide?

• Variable

• Positive

• Negative

• Neutral

What is the ionic charge of the ammonium ion?

• 2-

• 1-

• 1+

• 2+

How do the oxidation numbers in an ion relate to its charge?

• They are always positive.

• They are always zero.

• They add up to the charge of the ion.

• They are equal to the number of atoms.

What is the oxidation number of nitrogen in the ammonium ion?

• -1

• +3

• -3

• +1

What is the oxidation number of hydrogen when bonded to non-metals?

• +2

• 0

• -1

• +1

What is the typical ionic charge of sulfur in sulfide ions?

• 1+

• 2+

• 1-

• 2-

How is the oxidation number of sulfur in sulfide ions represented?

• -2

• +2

• +1

• -1

What is the oxidation number of sulfur in ammonium sulfide?

• +2

• +1

• -1

• -2

Which element in ammonium sulfide has an oxidation number of -3?

• Hydrogen

• Oxygen

• Sulfur

• Nitrogen