Oxidation Numbers/States

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Angela Wu-2H
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Joined: Fri Aug 30, 2019 12:16 am

Oxidation Numbers/States

Postby Angela Wu-2H » Sun Feb 23, 2020 7:56 pm

What's the difference between oxidation numbers and oxidation states? Also, how do I calculate oxidation numbers and why are oxidation numbers important?

Jessica Castellanos
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Re: Oxidation Numbers/States

Postby Jessica Castellanos » Sun Feb 23, 2020 8:07 pm

Oxidation number and oxidation state are the same thing, to calculate them there are some patterns like the elements in the first column have a +1 charge, the one's in the second column have a +2 charge, the transition metals vary in charge mostly, the halogens have a -1 charge, column 16 usually about a 2- charge, and when the atom is a solid or a gas, like Zn(s) or O2(g), it usually has no charge and other times you can simply calculate the charge of an atom by its total charge in a compound if you know the charge of the other atom(s). Lastly, oxidation states are important when balancing redox reactions to identify the half-reactions.

Hope Hyland 2D
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Joined: Wed Feb 20, 2019 12:16 am

Re: Oxidation Numbers/States

Postby Hope Hyland 2D » Sun Feb 23, 2020 8:17 pm

How do you use the oxidation numbers/states to get the half reactions? Also do we need to memorize the oxidation numbers for common molecules/elements?

Matthew Chan 1B
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Joined: Sat Sep 07, 2019 12:16 am

Re: Oxidation Numbers/States

Postby Matthew Chan 1B » Sun Feb 23, 2020 9:38 pm

Oxidation state is the charge of the atom with ionic chemical bonds. Oxidation number is the Roman numerals that we use to represent the oxidation state of the atom.

DanielTalebzadehShoushtari2A
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Joined: Fri Aug 02, 2019 12:16 am

Re: Oxidation Numbers/States

Postby DanielTalebzadehShoushtari2A » Sun Feb 23, 2020 9:42 pm

Hope Hyland 2D wrote:How do you use the oxidation numbers/states to get the half reactions? Also do we need to memorize the oxidation numbers for common molecules/elements?


You can use oxidation numbers to find out what species what reduced and what was oxidized. This becomes the basis for your half reactions, as there is an oxidation half-reaction and a reduction half-reaction. Also, the number (or difference) by which a species is either oxidized or reduced becomes the number of electrons that you write into a half reaction.
You should memorize that oxygen is generally -2 oxidation state and hydrogen is generally +1.

Ruby Richter 2L
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Re: Oxidation Numbers/States

Postby Ruby Richter 2L » Sun Feb 23, 2020 9:44 pm

Why is oxygen generally -2 oxidation state and hydrogen generally +1?

DanielTalebzadehShoushtari2A
Posts: 53
Joined: Fri Aug 02, 2019 12:16 am

Re: Oxidation Numbers/States

Postby DanielTalebzadehShoushtari2A » Sun Feb 23, 2020 9:48 pm

Ruby Richter 2L wrote:Why is oxygen generally -2 oxidation state and hydrogen generally +1?


Oxygen forms 2 covalent bonds to complete its octet, and because it has a high electronegativity relative to almost every other element, it will pull these electrons closer to it, effectively owning them and resulting in a -2 oxidation state.
Hydrogen is +1 for similar reasoning in that it tends to form a single covalent bond in which its electron is shared closer to the other atom and not to itself.

Abigail_Hagen2G
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Joined: Fri Aug 09, 2019 12:17 am

Re: Oxidation Numbers/States

Postby Abigail_Hagen2G » Sun Feb 23, 2020 9:51 pm

Yeah, you need to know the general oxidation states to see what's happening with the half reactions

Nick Lewis 4F
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Re: Oxidation Numbers/States

Postby Nick Lewis 4F » Sun Feb 23, 2020 11:45 pm

Can someone explain again why Hydrogen is only capable of +1 ox state?


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