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1. Totally fill a 5-mL
vial with Cola. 2. Close it by a stopper containing a long
injection needle.
3. Pierce the stopper
by a second needle: Take care that the needles do not touch each other.
4. Firmly fix the
stopper in the vial. 5. Left:
Connect the needles with a 9-Volt battery.
* Observations
Gas
bubbles can be seen at both needles (More gas at the left needle).
* The Cola is pressed out
of the vial by the rising gases.
* Close the vial by a rubber
stopper, leave it for the next experiment.
Explanation:
By a chemical reaction water was decomposed
leaving the elements hydrogen and oxygen.
More hydrogen is formed
at the negativen electrode and less oxygen at the positiven electrode.
2 H2O(l) ---analysis---> 2 H2(g) + O2(g)
The two gases mix to form oxyhydrogen gas.