Chemistry Reference
In-Depth Information
Procedure of Hydrogen Experiments
(a) A balloon is to be filled with hydrogen, sealed and released
(b) A candle is fixed on a 1-m-long glass tube and ignited, and the burning
candle is to be put near the balloon until the reaction sets in (caution: bang)
(c) Hydrogen streaming out of the steel container is to be ignited at a glass
tube: a nearly invisible flame appears
(d) A dry beaker with the opening down is to be held above the flame, the
formed water vapor condenses and a layer of water can be seen inside the
beaker
(e) Hydrogen is to be filled in an upside-down gas jar by air displacement.
A burning candle, which is fixed on a glass tube, is to be held inside the
gas jar, the candle is to be taken out and held inside again (see picture)
(f) A gas jar is to be filled with hydrogen upside-down and put on another
gas jar of the same size which contains air. Both gases are being mixed by
turning the gas jars. The gas jars are to be separated with cover glasses,
the gas mixtures to be ignited with a burning splint (caution: bang)
(g) The empty tin can with a concentric hole is to be put on a flat surface
with the opening on the bottom and to be filled with hydrogen by air
displacement. The gas is to be ignited at the hole and observed exactly
(caution: very loud bang after about 20 s)
Observation: (a) The balloon rises, (b) the balloon burns with a loud bang,
(c) the pure hydrogen burns calmly, (d) water vapor condenses in the beaker
to form liquid water, (e) the candle goes out in the jar, but ignites again,
when it is taken out of the jar, (f) the mixture of hydrogen and air (oxyhy-
drogen gas) burns very fast and forms water steam with a loud bang, (g) first
hydrogen burns calmly (a sheet of paper can be put above the hole: it
ignites), a buzzing sound can be heard after about 20 s and shortly after a
loud bang (prepare students for that bang!).
