Preparation of Oxygen

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Oxygen can be made from hydrogen , which decomposes slowly to form water and :
The word equation for this is:
       hydrogen peroxide → + oxygen
       2H2O2(aq) → H2O(l) + O2(g)
The of reaction can be increased using the catalyst, manganese oxide.
When manganese oxide is added to hydrogen peroxide, of oxygen are given off.
The reaction mixture is in a flask and the gas travels out through a in the top and down into a of water
It then bubbles up through a shelf into an upturned glass jar filled with water.
The gas collects at the top of the jar, forcing out into the basin below.