Oxidation Numbers and Ions

The video tutorial explains how to determine oxidation numbers for ions, including monatomic and polyatomic ions. It covers the general rules for finding oxidation numbers, highlights the differences between charges and oxidation numbers, and provides practice problems to reinforce learning. The tutorial also offers additional resources for further study.

What is the oxidation number of a monatomic ion with a charge of 2+?

• +2

• -2

• +1

• -1

Which of the following ions is an example of a monatomic ion?

• Phosphate ion

• Oxalate ion

• Sulfate ion

• Chloride ion

In a polyatomic ion, what must the sum of the oxidation numbers equal?

• The atomic mass

• The number of atoms

• The charge of the ion

• Zero

If an ion has four oxygen atoms each with an oxidation number of -2, what is the total oxidation number for the oxygen atoms?

• +8

• -8

• -4

• +4

What is the oxidation number of oxygen in most compounds?

• +2

• -1

• -2

• +1

What is the oxidation number of sulfur in the sulfate ion?

• +2

• -2

• +6

• +4

What is the oxidation number of phosphorus in the phosphate ion?

• +7

• +3

• -3

• +5

How many carbon atoms are there in the oxalate ion?

• Four

• One

• Two

• Three

What is the oxidation number of each carbon atom in the oxalate ion?

• +4

• -3

• +2

• +3

Which element's oxidation number is typically determined by its bonding in a compound?

• Phosphorus

• Carbon

• Oxygen

• Sulfur