I am not familiar with this particular
experiment, and a quick search didn't yield
anything for me either. I don't think a special
treatment would have been employed on the graphite
(and that wouldn't be a very good demonstration in
my mind, because it would be more a magic trick
than a scientific demonstration), but I wonder if
the graphite had been heated prior to introducing
it to the flask. Maybe that would be enough to get
it burning when it hits the flask. The other
question of course is whether the standard
demonstrations of the oxidation power of pure
oxygen (compared to air) would work for your
purpose? These are
1) introducing a long match or other piece of wood
that was lit and then blown out so it is only
glowing at the tip into the oxygen, which would
make it light up and burn again.
Hope this helps,
2) introducing a lit cigarette into the oxygen,
which should make it go up in flames
3) introducing glowing steel wool or wire into the
oxygen, which should make this "burn"
Obviously, you would want to try all these out
before you use them as a demonstration, to make
sure they work with your setup. And be safe.
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