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Peroxide vs. dioxide

by Whalstib
Tags: dioxide, peroxide
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Whalstib
#1
Mar18-10, 11:36 AM
P: 119
Hi,

What is the difference between peroxide and dioxide? Why isn't CO2 carbon peroxide?

I'm finding this important in Redox rxns but have not found a way to differentiate the 2 or actually define them.

Any help appreciatted!

Warren
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turbo
#2
Mar18-10, 11:41 AM
PF Gold
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P: 7,363
Look up the definition of "peroxide" and pay special attention to the O-O
Whalstib
#3
Mar18-10, 12:02 PM
P: 119
Thanks for being so quick!

But all I can find is a Wikipedia entry and have gleamed that peroxides are cations 2- as opposed to neutral O2 molecules.....right?

So how does one determine if it's a peroxide? NaO2, LiO2, CO2 etc....is it determined by the charge? So Li2O2 a peroxide and LiO2 a dioxide?

I think I got it! Right?

W

turbo
#4
Mar18-10, 12:27 PM
PF Gold
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P: 7,363
Peroxide vs. dioxide

What are the characteristics of peroxides? Are they oxidizers, and if so, why? Is CO2 an oxidizer? If not, why not?
Bohrok
#5
Mar20-10, 12:21 AM
P: 867
In beginning chemistry at least, you can look at it this way:

You can tell by the charge. Peroxide is O22- as in Li2O2.
The two oxygens in NaO2, however, are not part of peroxide because that ion has a 1- charge: O2- which is superoxide.
In a covalent compound such as CO2, the two oxygens would be called dioxide.


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