Mastering Oxidation Numbers in Chemical Compounds

This video tutorial explains how to determine oxidation numbers for elements in chemical compounds. It covers basic rules, such as elements by themselves having an oxidation number of zero and monatomic ions having oxidation numbers equal to their charge. The video provides examples to illustrate these rules and discusses exceptions, such as halogens having positive oxidation numbers when paired with oxygen. The tutorial emphasizes the importance of practice in mastering these concepts.

What is the oxidation number of an element that is not combined with any other elements?

• 2

• -1

• 0

• 1

For a monatomic ion, how is the oxidation number determined?

• It is the same as the ion charge

• It is always negative

• It is always positive

• It is always zero

In a neutral compound, what should the sum of the oxidation numbers equal?

• 1

• 0

• 2

• -1

What is the oxidation number of oxygen in most compounds?

• 0

• -2

• -1

• +1

How do you determine the oxidation number of nitrogen in NH3?

• +1

• -3

• +3

• 0

What is the oxidation number of hydrogen when it is combined with metals?

• -1

• +1

• 0

• +2

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

• -1

• The ion charge

• Zero

• +1

What is the oxidation number of bromine in BrO3-?

• 0

• +3

• -1

• +5

When fluorine is combined with another halogen, what is its oxidation number?

• +2

• +1

• 0

• -1

In ClF3, what is the oxidation number of chlorine?

• +1

• 0

• -1

• +3