Oxidation number

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Hannah_1G
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Joined: Wed Sep 18, 2019 12:22 am

Oxidation number

Postby Hannah_1G » Fri Mar 13, 2020 1:52 pm

How does oxidation number of an element relate to how many electrons it will lose or gain? I am confused on how to calculate when in acidic or basic solutions it changes the net charges.

SnehinRajkumar1L
Posts: 101
Joined: Thu Jul 11, 2019 12:15 am

Re: Oxidation number

Postby SnehinRajkumar1L » Fri Mar 13, 2020 2:00 pm

Oxidation numbers tell you which species is being reduced or oxidized. You determine the loss of electrons when you balance the half-reactions accordingly.

Ryan Yee 1J
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Joined: Sat Aug 17, 2019 12:16 am

Re: Oxidation number

Postby Ryan Yee 1J » Fri Mar 13, 2020 3:30 pm

Oxidation numbers are based on how many electrons an atom has. Increase in this number from reactants to products means reduction while decrease in the number is oxidation.

ramiro_romero
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Joined: Sat Sep 07, 2019 12:16 am

Re: Oxidation number

Postby ramiro_romero » Fri Mar 13, 2020 7:05 pm

Hannah_1G wrote:How does oxidation number of an element relate to how many electrons it will lose or gain? I am confused on how to calculate when in acidic or basic solutions it changes the net charges.


When balancing half reactions of a redox reaction, an elements change in oxidation number will tell you whether the element is being oxidized or reduced. If the oxidation number increases as the reaction proceeds forwards, the element is being oxidized and losing electrons (electrons are added on the right side of the half rxn). If the oxidation number decreases, the element is being reduced and gains electrons (electrons are added on the left side of the half rxn). Keep in mind that the change in an elements oxidation number will always be the same number of moles of electrons in its half rxn.

Daniel Yu 1E
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Joined: Sat Aug 24, 2019 12:15 am

Re: Oxidation number

Postby Daniel Yu 1E » Fri Mar 13, 2020 9:29 pm

Finding an oxidation number is essential to balancing Redox reactions. It will tell you whether an element is being reduced or oxidized. You can find the number by finding the typical oxidation state of the most electronegative nonmetal. There are rules for finding the oxidation state of nonmetals.

Samuel Tzeng 1B
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Joined: Sat Aug 24, 2019 12:15 am

Re: Oxidation number

Postby Samuel Tzeng 1B » Fri Mar 13, 2020 9:52 pm

The oxidation number change in a chemical reaction show what is being reduced and oxidized

Nohemi Garcia 1L
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Joined: Fri Aug 02, 2019 12:15 am

Re: Oxidation number

Postby Nohemi Garcia 1L » Fri Mar 13, 2020 10:00 pm

It relates to when you balance a redox equation, since they relate to charge. If an oxidation number/charge becomes more negative/smaller, then it means that there is a gain of electrons (Fe +3 ----> Fe +2). If it becomes more positive/larger, then there's a loss of electrons (Cr +3 ----> Cr +6). Remember that a loss of electrons is oxidation and a gain in electrons is reduction.

Calculating the oxidation numbers is not necessarily impacted by it being in an acidic/basic solution; the type of solution is more relevant when it comes to balancing (after you calculate the oxidation numbers and figure out which ions are being oxidized/reduced). For an acidic solution, you balance with H2O and H+. For a basic solution, you balance H2O and OH-.

Simon Dionson 4I
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Joined: Sat Sep 14, 2019 12:17 am

Re: Oxidation number

Postby Simon Dionson 4I » Sat Mar 14, 2020 12:09 am

Elements with positive oxidation numbers will generally gain electrons whereas elements with negative oxidation numbers will generally lose electrons. This can change depending on if you're dealing with a reduction or oxidation reaction.

Madelyn Romberg 1H
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Joined: Tue Oct 02, 2018 12:16 am

Re: Oxidation number

Postby Madelyn Romberg 1H » Sat Mar 14, 2020 10:09 am

Oxidation number related to the charge of the element within its molecule. You compare its charge on each side of the equation. If it becomes more positive, it loses electrons and is therefore oxidized. If it becomes more negative (less positive), it gains electrons and is therefore reduced.

Nuoya Jiang
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Joined: Sat Sep 14, 2019 12:17 am

Re: Oxidation number

Postby Nuoya Jiang » Sat Mar 14, 2020 10:19 am

So what is the difference between oxidation number and the charge the atom carries?

Juliet Stephenson 4E
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Joined: Wed Sep 18, 2019 12:21 am

Re: Oxidation number

Postby Juliet Stephenson 4E » Sat Mar 14, 2020 10:35 am

Nuoya Jiang wrote:So what is the difference between oxidation number and the charge the atom carries?

Charge says something about the relationship between the number of protons and electrons. Charge equals [Proton # - Electron #]. Oxidation numbers are more representations of the total number of electrons that an atom either gains or loses in order to form a chemical bond with another atom.

ValerieChavarin 4F
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Joined: Wed Sep 18, 2019 12:18 am

Re: Oxidation number

Postby ValerieChavarin 4F » Sat Mar 14, 2020 3:08 pm

the oxidation number helps identify whether a species is oxidized or reduced. Using the oxidation number, you can determine how many electrons are necessary to balance the charges of a half reaction.

605395381
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Joined: Mon Jun 17, 2019 7:24 am

Re: Oxidation number

Postby 605395381 » Sat Mar 14, 2020 3:40 pm

determining the oxidation number determines whether it is oxidizing or reducing. when balancing half reactions, it will show how many electrons will be lost or gained


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