biochemistry

Discussion of all aspects of biological molecules, biochemical processes and laboratory procedures in the field.

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nugnug
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biochemistry

Post by nugnug » Tue Nov 15, 2005 3:38 am

i wasn't really sure where to put this but how does the fact that when you add manganese dioxide in hydrogen peroxide and it fizzes and you add liver to hydrogen peroxide and it also fizzes say whether or not liver contains manganese dioxide.

and it said to consider that when manganese dioxide and water were added to hydrogen peroxide and boiled it didn't fizz as much.
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Tyran
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Post by Tyran » Tue Nov 15, 2005 6:37 am

hydrogen peroxide will react (or 'fizz') with a lot of substances
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MrMistery
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Post by MrMistery » Tue Nov 15, 2005 9:41 pm

the liver contains some iron, no Mg
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EmmVeePee
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Post by EmmVeePee » Wed Nov 16, 2005 7:01 am

Water dilutes the Hydrogen Peroxide so that fewer reactions between the two occur. The water seperates the Mg and H2O2.

I'm no chemist, but I believe the 'fizzing' are bubbles of Hydrogen (H2)

2Mg + H2O2 -> 2MgO +H2

^Sounds about right.
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victor
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Post by victor » Wed Nov 16, 2005 1:37 pm

Hey, wait a minute....
is it same between Manganeese dioxide and Magnesium oxide?
because I think thet Manganeese dioxide is MnO2..it's proven by there're 2 Oxygen atom which means that the oxidation number for Mn is +4., while Mg only has one oxidation number which is +2.
I think for that reaction, MnO2 acts as a catalyst.
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