water
(hydrogen oxide).2H2(g) + O2(g)
2H2O(l) gcsescience.com gcsescience.com
What are the General Tests for Hydrogen Gas?
1) Hydrogen gas, H2(g) has no colour or smell.
2) Hydrogen gas has no effect on moist
litmus paper
or moist universal indicator paper -
it is neutral.
3) Hydrogen gas burns with a characteristic 'pop'.
What is the Specific Test for Hydrogen Gas?
Hydrogen gas
is recognised by the 'pop' when it burns.
The 'pop' is the sound of a small
explosion.
Hydrogen gas is highly flammable!
hydrogen
+
oxygen water
(hydrogen oxide).
2H2(g) + O2(g) 2H2O(l)
This highly exothermic reaction is an example of oxidation.
How is
Hydrogen Gas Collected?
Hydrogen gas is less
dense than air
and can be
collected
by upward delivery, over water or by using a gas
syringe.
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