1. Lesson 2: Oxidation Numbers
UNIT 7:
Lesson 2: Oxidation Numbers

2. Oxidation Numbers
An oxidation number is the charge that an atom would possess if the species containing the atom were made up of ions.
We can generally assume:
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3. Calculating Oxidation Numbers
The sum of the positive charges and the negative charges must equal the overall charge on the species.
Examples:
What is the oxidation number of P in the molecule H4P2O7?
What is the oxidation number of P in P4?
10 min

4. Brain Break!
Spot It!

5. Your Turn! What is the oxidation number of Cr in Cr3+?
What is the oxidation number of S in SO42-?
10 min

6. What Do Oxidation Numbers Mean?
An increase in oxidation number means that an atom is being oxidized.
A decrease in oxidation number means that it is being reduced.
5 min

7. Practice:
Pg. 194 #4 and 5
15 min