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.

--- 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

[tapanray]

I am from India, I really love the way you explaining the things, all my doubts have cleared of finding oxidation number, thanks a lot...

[headempty]

Omg I just got saved from failing my chemistry quiz 😭😭

[moanashey]

I love you Sir u taught me which my teachers can't teach in 15 years..thanks a lot ..lots of love from India ❤️

[rajarathi]

Excellent explanation sir, your video are short which saves our time a lot. Thank You very much sir for practice questions.

[ondasikora]

Sir, that was a beauty! Eventually, I couldn't understand this for year and half. However, in two days, thanks to your video, I finally understood it and I am not going to fail the chemistry. Huge thanks!

[rohanlingam]

Thank you! This was incredibly helpful - I tried out problems by myself at first, and then checked to see if I got them right. Watching you walk us through each problem helped me figure out the problems in my work.

[vaibhavvishal]

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You helped me a lot.
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I was facing too much problems in solving them.
Whenever I search for any question in chemistry, then you're there to help me.
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[sadiqkps]

By watching your videos, I get to understand the concepts easily. Thank you so much

[abdelrahmanali]

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[snehasinchana]

A life saver sometimes...thank you Dr.B!

[janetfakava]

My goodness! Now i understand ! Thank you for teaching Dr.B

[oualid]

You are a life saver Dr B! Do you have any videos on ionization energy and stuff like that?

[yashkingar]

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[kashafranishaikh]

Thanks a lot.
This video proved really helpful in my examination days!!

[corbyntaylor]

Thank you for the helpful video. You explained it really well, I also liked the progression of difficulty in the problems.

[AmanKumar-mmxz]

I don't how I should thank u ... Very well explained sir ... 🙏🙏. Love from INDIA

[Saadman__muhib]

You saved my day sir 😭. On 20th may is my chemistry exam and I was facing a lot of problems with the oxidation numbers . But thank you so much, your explanation helped me out.

[priyanshigupta]

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[bvfiogg]

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[shaniceshipp]

very helpful. Even through general chemistry is not the hardest, the way its being dazzled with power points on students is very fast, and condensed. I hate how I can't even internalized the material as all they care about is memorization..sad. Maybe I should of attended a private institution, literally feel like a cash cow. Labs lack substance and act as a time waster...