Test for oxygen
A glowing splint applied to a sample of oxygen gas will relight.
Oxygen can be made from hydrogen peroxide, which decomposes slowly to form water and oxygen:
hydrogen peroxide → water + oxygen
2H2O2(aq) → 2H2O(l) + O2(g)
The rate of reaction can be increased using a catalyst, manganese(IV) oxide. When manganese(IV) oxide is added to hydrogen peroxide, bubbles of oxygen are given off.
To make oxygen in the laboratory the same apparatus that was used for the preparation of hydrogen is used. Hydrogen peroxide is poured into a conical flask containing some solid manganese(IV) oxide. Hydrogen peroxide is colourless solution and manganese(IV) oxide is a black solid.
Instead of the gas jar and water bath, a gas syringe could be used to collect the oxygen.