Oxidation Numbers and Their Calculation

This video tutorial introduces the concept of oxidation numbers in chemistry, explaining how they represent the potential charge of an atom within a molecule. It covers the processes of oxidation and reduction, detailing how to calculate oxidation numbers in various compounds. Special cases, such as hydrides and peroxides, are discussed, and examples are provided to illustrate the calculations. The tutorial concludes with a call to action for viewers to engage with additional resources and follow-up content.

What does the oxidation number indicate in a molecule?

• The exact number of electrons gained or lost

• The total number of atoms in the molecule

• A possible charge of an atom within the molecule

• The number of protons in the nucleus

Which family always has an oxidation number of +1?

• Family 2

• Family 6

• Family 1

• Family 7

What is the usual oxidation number of aluminum?

• +2

• +1

• +3

• +4

In which case does hydrogen have an oxidation number of -1?

• When bonded to a metal

• When in a neutral molecule

• When in a peroxide

• When bonded to a non-metal

What is the oxidation number of oxygen in peroxides?

• -2

• -1

• +1

• +2

How do you determine the oxidation number of sulfur in H2SO4?

• +8

• +6

• +4

• +2

What is the oxidation number of phosphorus in Na3PO4?

• +3

• +4

• +5

• +6

How do you handle compounds with a net charge when calculating oxidation numbers?

• Double the charge

• Set the sum of oxidation numbers to zero

• Ignore the charge

• Set the sum of oxidation numbers equal to the charge

What is the oxidation number of iodine in IO2-?

• +1

• +2

• +3

• +4

In the compound K2Cr2O7, what is the oxidation number of chromium?

• +7

• +2

• +3

• +6