|MadSci Network: Biochemistry|
I would quote a line from a chemistry experiment book I found in that nasty smelling chemistry laboratory
"A large amount of MnO2 was liberated from Duracells, washed, and dried. A 1/4" diameter chunk was dropped into a dixie cup of H2O2. Reaction was vigorous, and immediate, sending steam all over the room."
The general Reaction is:
MnO2 H2O2 -------> H2O + O2 CatalaseManganese dioxide is an inorganic catalyst (but not an enzyme) for the breaking down of hydrogen peroxide. Catalase is a protein catalyst (enzyme) for the breaking down of hydrogen peroxide.
Hydrogen peroxide decomposes according to the summary reaction equation:
H2O2 (l) —> H2O (g) + ½ O2 (g) + Heat
The amount of heat released (at normal conditions) in this exothermic reaction is 98.31 kJ/mole
You see that there is a bond breakage and no bond formation. So, there is an overall decrease in energy and energy is liberated as heat.
1. Walter C. Schumb, Charles N. Satterfield and Ralph L. Wentworth, Hydrogen Peroxide, Reinhold Publishing Corporation, 1955.
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