Oxidation Numbers and Chemical Compounds

The video tutorial explains how to determine the oxidation numbers of elements in KNO2, potassium nitride. It begins by using periodic table rules to identify the oxidation number of potassium as +1. Oxygen is identified with a -2 oxidation number. The video then explains that in a neutral compound, the sum of oxidation numbers must equal zero. Using this information, the oxidation number of nitrogen is calculated to be +3. The tutorial concludes with a recap of the process used to find these oxidation numbers.

What is the primary tool used to determine oxidation numbers in KNO2?

• Periodic Table

• Chemical Equations

• Spectroscopy

• Molecular Models

Which group does potassium belong to in the periodic table?

• Group 2

• Group 1

• Group 16

• Group 15

What is the typical oxidation number assigned to oxygen?

• -2

• -1

• +1

• +2

Why must the sum of oxidation numbers in a neutral compound equal zero?

• To balance the chemical equation

• To ensure the compound is stable

• Because there is no net charge

• To match the molecular weight

What is the oxidation number of potassium in KNO2?

• -1

• +1

• +2

• 0

How many oxygen atoms are present in KNO2?

• One

• Two

• Four

• Three

What oxidation number must nitrogen have to balance the compound KNO2?

• +1

• +2

• +3

• +4

What is the total oxidation number of the two oxygen atoms in KNO2?

• -2

• -4

• -6

• -8

What is the final oxidation number of nitrogen in KNO2?

• +4

• +3

• +2

• +1

What is the overall charge of the compound KNO2?

• +2

• +1

• 0

• -1