## oxidation number

josmit_1D
Posts: 107
Joined: Fri Aug 09, 2019 12:17 am

### oxidation number

how do you calculate oxidation numbers?

Petrina Kan 2I
Posts: 102
Joined: Fri Aug 30, 2019 12:17 am

### Re: oxidation number

You look at the known charges or the charges that are present on the specific element in the reaction, and make it equal that charge. If there is no charge present on a compound then the oxidation numbers cancel out!

Martina
Posts: 111
Joined: Thu Jul 25, 2019 12:16 am

### Re: oxidation number

You have to check the known charges of the ions and make sure that they balance out for the entire equation.

Posts: 111
Joined: Thu Jul 25, 2019 12:17 am

### Re: oxidation number

Oxidation numbers are basically the charges on an atom/ion...do you have a specific question/reaction in mind?

By the way, I found this really helpful article on Khan Academy https://www.khanacademy.org/science/chemistry/chemical-reactions-stoichiome/types-of-chemical-reactions/a/oxidation-number if you wanted to take a look...

005162520
Posts: 101
Joined: Tue Sep 24, 2019 12:17 am

### Re: oxidation number

From the periodic table, which ones are the common ones when they are the most electronegative?

SVajragiri_1C
Posts: 115
Joined: Thu Jul 11, 2019 12:16 am

### Re: oxidation number

You can just memorize the charge for the basic elements like oxygen, nitrogen, carbon, hydrogen, etc. And the others are pretty similar to their ion charge, so just know that.

Louise Lin 2B
Posts: 97
Joined: Sat Aug 17, 2019 12:15 am

### Re: oxidation number

you can also find oxidation numbers in the context of the reactions, like when you write out the oxidation and reduction half-reactions

SVajragiri_1C
Posts: 115
Joined: Thu Jul 11, 2019 12:16 am

### Re: oxidation number

H is +1, O is -2. The sum of oxidation numbers is equal to the overall charge of the compound, so do some backwards calculations to figure out oxidation numbers of other compounds.

ABombino_2J
Posts: 102
Joined: Thu Jul 11, 2019 12:15 am

### Re: oxidation number

You need to take the known charges of the elements in the molecule and then find the different between that and the overall charge of the reaction.

Leslie Almaraz 4G
Posts: 99
Joined: Fri Aug 02, 2019 12:16 am

### Re: oxidation number

it also can depend on the reaction and the compound

anjali41
Posts: 109
Joined: Fri Aug 09, 2019 12:15 am

### Re: oxidation number

It is important to know that O has an oxidation number of 2- and H has an oxidation number of 1+. You are usually given the overall charge of a molecule. All the individual charges should add up to the overall charge. Thus, you can then solve for the unknown oxidation number.

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