Oxidation Numbers and Free Elements

This video tutorial explains the concept of oxidation numbers, focusing on potassium as a free element. It describes how free elements like potassium, sodium, and iron have an oxidation number of zero. The video also explores how oxidation numbers change when elements bond, using potassium and chlorine as examples. Potassium, when bonded, typically has a +1 oxidation state. The tutorial concludes with a recap of these concepts.

What is the oxidation number of potassium when it is in its elemental form?

• 0

• -1

• +1

• +2

Which of the following is considered a free element?

• KCl

• CO2

• H2O

• Na

Which of the following is NOT a free element?

• S8

• Fe

• H2O2

• KCl

When potassium and chlorine bond together, what is the oxidation number of potassium?

• +1

• 0

• -1

• +2

In a chemical equation, what happens to the oxidation number of chlorine when it bonds with potassium?

• 0

• +1

• -1

• +2

What is the oxidation number of chlorine when it is in its elemental form?

• +1

• 0

• +2

• -1

What is the oxidation number of potassium when it is not bonded to any other element?

• +1

• +2

• 0

• -1

When potassium bonds with another element, what is its most likely oxidation number?

• +1

• 0

• -1

• +2