Understanding Oxidation Numbers in Ions

This video tutorial explains how to determine the oxidation numbers of elements in the NO2+ ion. It begins by introducing the concept of oxidation numbers and the general rules for finding them. The video then focuses on identifying the oxidation number of oxygen, which is typically -2, and uses this information to calculate the oxidation number of nitrogen. The tutorial concludes with a recap of the steps taken to find the oxidation numbers, emphasizing the importance of the sum of oxidation numbers equaling the ion's charge.

What is the main objective of the video tutorial?

• To find the oxidation numbers for elements in NO2+

• To describe the properties of gases

• To explain the periodic table

• To discuss chemical bonding

What is the typical oxidation number assigned to oxygen?

• +1

• 0

• -2

• +2

How do the oxidation numbers of the two oxygen atoms in NO2+ add up?

• +2

• +4

• -2

• -4

What must the sum of the oxidation numbers in an ion equal?

• Zero

• The mass number

• The charge of the ion

• The atomic number

What is the oxidation number of nitrogen in NO2+?

• +6

• +3

• +5

• +4

Why is the oxidation number of nitrogen in NO2+ determined to be +5?

• Because it balances the -4 from oxygen to equal the ion's charge of +1

• Because it is a noble gas

• Because it is a transition metal

• Because nitrogen always has an oxidation number of +5

What rule is used to find the unknown oxidation number in an ion?

• The sum of oxidation numbers equals zero

• The sum of oxidation numbers equals the ion's charge

• The sum of oxidation numbers equals the mass number

• The sum of oxidation numbers equals the atomic number

What is the final conclusion about the oxidation number of nitrogen in NO2+?

• It is +3

• It is -3

• It is +5

• It is -5