oxidizing and reducing agents

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Ghadir Seder 1G
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Joined: Sat Sep 14, 2019 12:17 am

oxidizing and reducing agents

Postby Ghadir Seder 1G » Wed Mar 04, 2020 5:31 pm

I know that oxidation is the loss of electrons and reduction is the gain of electrons, but how can I tell which one is which by looking at the chemical reaction? Do I use their oxidation states?

Hiba Alnajjar_2C
Posts: 108
Joined: Fri Aug 09, 2019 12:17 am

Re: oxidizing and reducing agents

Postby Hiba Alnajjar_2C » Wed Mar 04, 2020 5:39 pm

You should look at which elements' oxidation numbers change. If the oxidation number increases, then the species is being oxidized. For example, if it goes from 2- to 0, it is being oxidized. If the oxidation number decreases, then the species is being reduced (since it's becoming more negative). If an element's oxidation number goes from 1 to -1, it is being reduced.

Andrew Liang 1I
Posts: 105
Joined: Fri Aug 30, 2019 12:18 am

Re: oxidizing and reducing agents

Postby Andrew Liang 1I » Wed Mar 04, 2020 5:41 pm

Yes look at their oxidation states on the left and the right of the chemical reaction. I believe this is how you would usually determine whether something is oxidized or reduced.

Kallista McCarty 1C
Posts: 212
Joined: Wed Sep 18, 2019 12:18 am

Re: oxidizing and reducing agents

Postby Kallista McCarty 1C » Wed Mar 04, 2020 5:53 pm

You should look at the oxidation states or overall charge of the molecule to determine which is being oxidized or reduced

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

Re: oxidizing and reducing agents

Postby Kayli Choy 2F » Thu Mar 05, 2020 2:28 pm

Additionally, the substance being reduced (oxidation number becoming more negative) is the oxidizing agent (because it is allowing the other substance to be oxidized). The substance being oxidized (oxidation number becoming more positive) is the reducing agent (because it is allowing the other substance to be reduced).

Cooper Baddley 1F
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Joined: Wed Sep 18, 2019 12:19 am

Re: oxidizing and reducing agents

Postby Cooper Baddley 1F » Thu Mar 05, 2020 3:25 pm

Use the oxidation numbers to determine which is oxidized and reduced. Then whatever one is oxidized is the reducing agent and the one being reduced is the oxidizing agent.

Astrid Lunde 1I
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Joined: Sat Sep 07, 2019 12:16 am

Re: oxidizing and reducing agents

Postby Astrid Lunde 1I » Thu Mar 05, 2020 4:45 pm

Look at the oxidation numbers of the different elements.

William Francis 2E
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Joined: Wed Sep 18, 2019 12:20 am

Re: oxidizing and reducing agents

Postby William Francis 2E » Thu Mar 05, 2020 5:05 pm

I find it very helpful to write out the half reactions to really gain an understanding of the redox reaction. To do this, you will have to determine the oxidation numbers of the elements being reduced and oxidized. Toolbox K.1 on page F80 is very useful to refresh on oxidation numbers.

Juana Abana 1G
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Joined: Wed Sep 18, 2019 12:15 am

Re: oxidizing and reducing agents

Postby Juana Abana 1G » Fri Mar 06, 2020 6:42 am

William Francis 2E wrote:I find it very helpful to write out the half reactions to really gain an understanding of the redox reaction. To do this, you will have to determine the oxidation numbers of the elements being reduced and oxidized. Toolbox K.1 on page F80 is very useful to refresh on oxidation numbers.



Thanks this is very helpful.

Rodrigo2J
Posts: 102
Joined: Sat Jul 20, 2019 12:16 am

Re: oxidizing and reducing agents

Postby Rodrigo2J » Fri Mar 06, 2020 10:35 am

You can identify the anode and cathode by writing out the half-reaction and looking at their reduction cell potentials. If the reduction cell potential is more negative, it is oxidizing, and if it is more positive it will be reducing.

Mariah
Posts: 104
Joined: Fri Aug 02, 2019 12:16 am

Re: oxidizing and reducing agents

Postby Mariah » Fri Mar 06, 2020 11:06 am

Ghadir Seder 1G wrote:I know that oxidation is the loss of electrons and reduction is the gain of electrons, but how can I tell which one is which by looking at the chemical reaction? Do I use their oxidation states?


I usually use OIL RIG, Oxidation is loss Reduction is gain (of electrons).


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