oxidation numbers

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Jasmine W 1K
Posts: 49
Joined: Sat Sep 07, 2019 12:18 am

oxidation numbers

Postby Jasmine W 1K » Thu Feb 20, 2020 12:29 pm

Do you have to figure out the oxidation numbers of all of the parts of the reaction in order to figure out which parts are oxidized and which are reduced?

Kassidy Ford 1I
Posts: 103
Joined: Sat Aug 17, 2019 12:16 am
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Re: oxidation numbers

Postby Kassidy Ford 1I » Thu Feb 20, 2020 1:04 pm

It is helpful to know all the oxidation numbers and that is one way to do it, but there are several other ways as well. We will usually be given a table of reduction reactions with there E values, so you can tell from that as well. It also helps to look at oxygen, because that is where the root of the word oxidation came from. If a molecule gains oxygen it usually means it was oxidized and if a molecule loses oxygen it usually means it has been reduced.

005324438
Posts: 51
Joined: Sat Aug 24, 2019 12:16 am

Re: oxidation numbers

Postby 005324438 » Thu Feb 20, 2020 11:54 pm

For the most part, with a bit of practice, it becomes easier to tell which is being oxidized and which is being reduced. We know O and H, all alkali metals, and all halogens will be unchanging for the most part, so we are looking for transition metals. Once we know the molecule with the transition metals, then yes within that molecule we must find every oxidation number just to make sure, but we don't need to find the oxidation numbers for all molecules.

Nathan Rothschild_2D
Posts: 131
Joined: Fri Aug 02, 2019 12:15 am

Re: oxidation numbers

Postby Nathan Rothschild_2D » Fri Feb 21, 2020 12:13 am

You just have to find the oxidation numbers for the elements that are changing(being oxidized or reduced). If you do not know which elements are being oxidized or reduced then you should calculate all of the oxidation numbers to find out.

Kayli Choy 2F
Posts: 100
Joined: Sat Aug 24, 2019 12:17 am

Re: oxidation numbers

Postby Kayli Choy 2F » Sun Feb 23, 2020 10:40 am

Additionally, if a reactant’s oxidation number is increasing, the reactant is being oxidized, and if the oxidation number is decreasing, it is being reduced.

HuyHa_2H
Posts: 100
Joined: Wed Sep 11, 2019 12:15 am

Re: oxidation numbers

Postby HuyHa_2H » Sun Feb 23, 2020 10:54 am

What I usually do is identify the ones that are unchanging like how oxygen and ozone have oxidation numbers of zero. From, there I'd find the oxidation numbers for the transition metals or whatever other element/compounds there are. Based on the changes in oxidation numbers of some species in the reactant and product side, you can identify what's being oxidized and reduced.


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