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H
R O F I
Y D R O
Tip: If you want to achieve the optimum output of the fuel cell, fl ush all the air out of the fuel
cell. To do this, continue producing hydrogen until the last of the water has been pressed out of
the oxygen storage cylinder and into the overfl ow chamber above it.
Experiment 1:
Measure how much hydrogen is produced in a certain period of time during the
production of hydrogen and oxygen. You can read off the quantity of hydrogen
from the scale on the hydrogen storage cylinder. Watch what effect the light inten-
sity has on the quantity produced.
If the light intensity is high, more hydrogen is produced during the same time. If the light inten-
sity is too low, no hydrogen is produced at all.
If you use a 100 W light bulb as a light source at a distance of 30 cm from the solar modules, it
takes around 15 min for the hydrogen storage cylinder to completely fi ll with gas.
Experiment 2:
Observe the quantities of gas in the two storage cylinders during the hydrogen
and oxygen production. What can you observe?
Twice as much hydrogen is produced as oxygen. Why?
Water (H
O) consists of compounds of hydrogen (H
2
called water molecules. A water molecule consists of two hydrogen atoms and one oxygen
atom. When the molecule is split during electrolysis, twice as many hydrogen molecules are
produced as oxygen molecules.
2 H
2 water molecules
20
2 HKC_GB.indd 20
2 HKC_GB.indd 20
C
K
I
E L L
I T
N S T R U C T I O N
O
2
M
A N U A L
) and water (O
). These compounds are
2
2
2 H
2
+
2 hydrogen molecules
O
2
1 oxygen molecule
13.02.2010 12:29:27
13.02.2010 12:29:27
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