Finding Oxidation Numbers Practice Problems and Answers

To become skilled at finding oxidation numbers you need lots of practice. In this video you’ll be presented with nine practice problems that become increasingly difficult.

First, calculate the oxidation numbers for a compound, then go to the time listed in the video for a full explanation. Think of it as a video worksheet on oxidation numbers.

Watch    • How to Find Oxidation Numbers  (Rules...   for a full explanation of how to find oxidation numbers.

-- General Rules for Determining Oxidation Numbers --

1. In a neutral compound all oxidation numbers must add up to zero.

2. In an ion the all oxidation numbers must add up to the charge on the ion.

3. Free elements have an oxidation number of zero (e.g. Na, Fe, H2, O2, S8).

4. Fluorine (F) = -1

5. Group 1 = +1 Group 2 = +2

6.Hydrogen with Non-Metals = +1 Hydrogen with Metals (or Boron) = -1

7. Oxygen = -2 (except with Fluorine or Peroxides)

8. Group 17(7A) = -1 Group 16 (6A) = -2 Group 15 (5A) = -3


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