hydrogen peroxide

You will see bubbles appearing. It is because:
Hydrogen peroxide is stable at room temperature.
The presence of a catalyst may cause it to decompose.


hydrogen peroxide
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oxygen + water.
2H2O2(aq)
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O2(g) + 2H2O(l)
The rate of the reaction can be followed
by recording the volume of oxygen produced
(you must know a test for oxygen).
The catalyst used is Manganese(IV) oxide - MnO2(s)
Using more catalyst will show an increase in reaction rate.
This is because more catalyst will have a greater surface area
for the reaction to take place.