oxidation reduction problem important (1 Viewer)

[clicker]

2H202 ----> 2H20 + 02

which species is the oxidising agent/ reducing agent and why ?

please help
thanx

 

[ishq]

This is involving Oxidation Number.

Is this still in the syllabus?

 

[~*HSC 4 life*~]

tip:
the oxidising agent/oxidant is what CAUSES something else to oxidise, it itself reduces
the reducing agent/reductant is what CAUSES somethign else to reduce, it itself oxidises

 

[clicker]

therefore is 2H202 THE OXIDISING AGENT?

 

[clicker]

in the conversion of h2o2 to 02 how many electrons are lost or gained by the two oxygen atoms

 

[funking_you]

2H₂₀2 ----> 2H₂0 + 0₂

which species is the oxidising agent/ reducing agent and why ?

please help
thanx

To identify a redox reaction, we investigate the oxidation states of the individual species involved.

In hydrogen peroxide, the oxidation state of oxygen is:
0 = (+1)(4) + (x)(4)
0 = +4 + 4
0 = 4 + 4x
-4 = 4x
-4/4 = x
-1 = x

therefore the oxidation state of oxygen in hydrogen perioxide is -1, and if we repeat the same process for the oxidation state of oxygen in water, find that its oxidation has changed to -2.
An decrease in oxidation state means that the species was reduced (to get from -1 to -2 it must gain an electron)
If oxygen was reduced, then it is the oxidising agent.

 

[ishq]

Exactly! It involves using Oxidation Number.
Is this in the syllabus?

 

[Dreamerish*~]

i thought the oxidation number WAS in the syllabus?
we use it all the time...

 

[tennille]

i thought the oxidation number WAS in the syllabus?
we use it all the time...

Yeah, it is.

 

[nit]

I'd assume it would be in the syllabus given the electrochem topic in the production of materials module. It's fairly easy to test and involves the application of a few simple rules in any case, so I can't see why you wouldn't be expected to know it.

 

[Dreamerish*~]

99.95 UAI.

 

[ishq]

The concept is fairly straightforward.
Yes I know it.
Yes we've done it.
But, after we did it, our teacher said it wasn't specifically in the syllabus.
Possibly wrong.

Thanks guys