oxidation


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204929947
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Joined: Fri Apr 06, 2018 11:03 am

oxidation

Postby 204929947 » Sun May 13, 2018 10:43 pm

Hello, I was just wondering why is it that some elements have oxidation states - or +? Also, why is it that both - and + can exist for the same element?

Maria Trujillo 1L
Posts: 47
Joined: Fri Apr 06, 2018 11:05 am

Re: oxidation

Postby Maria Trujillo 1L » Sun May 13, 2018 10:47 pm

So when you are dealing with oxidation states, you will generally have a + or -, because almost any element can have e- added or taken away in order to get to the nearest noble gas configuration. The goal is to get an octet. An example from chapter 3 HW is 3.23, Cl can have -1 or +7. This is because if you add one e- you will reach the noble gas Ar and if you subtract 7 e- you will reach the noble gas Ne configuration. I hope this helps.

Myles Chang 1B
Posts: 29
Joined: Fri Apr 06, 2018 11:02 am

Re: oxidation

Postby Myles Chang 1B » Sun May 20, 2018 1:08 pm

In general, elements closer to the left side of the periodic table (s-block and some of p-block) form cations because it is easier for them to lose, for example, 2 electrons in the case of Mg rather than gain 6. Likewise, it would require a lot of energy to pull 7 valence electrons away from a chlorine atom to give it noble gas configuration, so it is very electronegative and tends to gain an electron.

princessturner1G
Posts: 31
Joined: Fri Apr 06, 2018 11:05 am

Re: oxidation

Postby princessturner1G » Sun May 20, 2018 11:09 pm

Maria Trujillo 1E wrote:So when you are dealing with oxidation states, you will generally have a + or -, because almost any element can have e- added or taken away in order to get to the nearest noble gas configuration. The goal is to get an octet. An example from chapter 3 HW is 3.23, Cl can have -1 or +7. This is because if you add one e- you will reach the noble gas Ar and if you subtract 7 e- you will reach the noble gas Ne configuration. I hope this helps.

Is the main goal of oxidation to reach a noble gas configuration?

105012653 1F
Posts: 30
Joined: Fri Apr 06, 2018 11:02 am

Re: oxidation

Postby 105012653 1F » Sun May 20, 2018 11:59 pm

Sorry, I'm kind of confused; what exactly is an oxidation state?

Maria Trujillo 1L
Posts: 47
Joined: Fri Apr 06, 2018 11:05 am

Re: oxidation

Postby Maria Trujillo 1L » Sun May 27, 2018 10:19 pm

105012653 1F wrote:Sorry, I'm kind of confused; what exactly is an oxidation state?

Oxidation state is the same as the charge given to an element when it is by itself.

Maria Trujillo 1L
Posts: 47
Joined: Fri Apr 06, 2018 11:05 am

Re: oxidation

Postby Maria Trujillo 1L » Sun May 27, 2018 10:23 pm

princessturner1G wrote:
Maria Trujillo 1E wrote:So when you are dealing with oxidation states, you will generally have a + or -, because almost any element can have e- added or taken away in order to get to the nearest noble gas configuration. The goal is to get an octet. An example from chapter 3 HW is 3.23, Cl can have -1 or +7. This is because if you add one e- you will reach the noble gas Ar and if you subtract 7 e- you will reach the noble gas Ne configuration. I hope this helps.

Is the main goal of oxidation to reach a noble gas configuration?

Oxidation state, I believe, is just the state of the element of how many electrons it needs to lose or gain to get to the sate of a noble gas. So to answer your question, yes, I believe so.

Surya Palavali 1D
Posts: 24
Joined: Fri Apr 06, 2018 11:04 am

Re: oxidation

Postby Surya Palavali 1D » Sun May 27, 2018 10:39 pm

The + denotes losing an electron, the - denotes gaining one.


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