Oxidation Numbers

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Letty Liu 2C
Posts: 105
Joined: Fri Aug 09, 2019 12:16 am

Oxidation Numbers

Postby Letty Liu 2C » Tue Feb 18, 2020 10:58 pm

When calculating net charges, are oxygen and hydrogen the only atoms that will always be its actual oxidation number?

Isha_Maniyar_Dis2E
Posts: 110
Joined: Thu Jul 11, 2019 12:16 am

Re: Oxidation Numbers

Postby Isha_Maniyar_Dis2E » Wed Feb 19, 2020 12:18 am

Halogens are always -1, oxygen is (almost) always -2, and hydrogen is always +1. In general, earth metals are +1 and alkaline earth metals are +2.

Hope this helped!

Amy Pham 1D
Posts: 103
Joined: Fri Aug 09, 2019 12:15 am

Re: Oxidation Numbers

Postby Amy Pham 1D » Wed Feb 19, 2020 2:49 pm

As stated in the answer above, note that oxygen does not always have its expected oxidation state of -2! Although that is what it is the majority of the time, there are exception cases that occur significantly frequently.

Morgan Carrington 2H
Posts: 54
Joined: Wed Nov 14, 2018 12:22 am

Re: Oxidation Numbers

Postby Morgan Carrington 2H » Wed Feb 19, 2020 2:57 pm

It is common to see them with those oxidation numbers, but there can be exceptions from time to time. I would say to be aware of it and try not to fall into a pattern because it could cause future mistakes!

Luc Zelissen 1K
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Joined: Mon Jun 17, 2019 7:23 am

Re: Oxidation Numbers

Postby Luc Zelissen 1K » Wed Feb 19, 2020 8:00 pm

The oxidation state of oxygen in its compounds is usually -2, except for peroxides like H2O2, and Na2O2, in which the oxidation state for O is -1. The oxidation state of hydrogen is +1 in its compounds, except for metal hydrides, such as NaH, LiH, etc., in which the oxidation state for H is -1.

Maya Pakulski 1D
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Joined: Thu Jul 11, 2019 12:17 am

Re: Oxidation Numbers

Postby Maya Pakulski 1D » Wed Feb 19, 2020 8:44 pm

What are oxidation numbers used for?

Luc Zelissen 1K
Posts: 57
Joined: Mon Jun 17, 2019 7:23 am

Re: Oxidation Numbers

Postby Luc Zelissen 1K » Wed Feb 19, 2020 9:13 pm

Maya Pakulski 1D wrote:What are oxidation numbers used for?
If you know the oxidation numbers of a species on both sides of a chemical reaction, then you will know if it is reduced, stay the same, or oxidized

CNourian2H
Posts: 106
Joined: Fri Aug 30, 2019 12:16 am

Re: Oxidation Numbers

Postby CNourian2H » Wed Feb 19, 2020 9:15 pm

Maya Pakulski 1D wrote:What are oxidation numbers used for?


I am also partly confused with this. I understand we use the oxidation numbers for redox reactions, but can you explain how it in an example?


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