Place the hydrogen peroxide solution in the flask. Ad a small amount of
manganese dioxide or other suitable catalyst to speed up the decomposition of the
hydrogen peroxide. Note that the solution is bubbling.
Light a candle or a burner.
Holding a wood splint with tongs, light the end of the wood splint. Allow it to
burn for a few seconds until you notice that the end of the wood splint is glowing
red. Blow out the flame. Insert the glowing end of the wood splint into the flask.
If sufficient oxygen has been generated, the wood splint will burst into flame.
Withdraw the burning splint from the flask.
This demonstration can be repeated several times until the reaction has ceased.
This reaction is the catalytic decomposition of hydrogen peroxide:
2 H2O2 → 2 H2O + O2
This is the classic test for oxygen gas.
This short flash animation shows how we can determine the number of moles of water of crystallisation in a hydrated salt such as washing soda. The salt is weighed, then heated, cooled and reweighed over and over until a constant mass is reached. The ratio of anhydrous salt to water of crystallisation is determined in grams and converted to moles.
Here is my A1 guide to the Organic Experiments for the leaving cert Chemistry.
Experiments I cover are: To Prepare a sample of Soap, To Prepare ethanal and examine its properties, To Prepare Ethanoic Acid and examine its properties, Extraction of clove oil from cloves using steam distillation, prepare Ethene, prepare Ethyne, To separate components of ink in felt tipped pens using paper chromatography and To detemine the heat of neutralisation of hydrochloric acid with sodium hydroxide.