Thank You jasmine for that lovely
introduction she has to say nice things
because she’s in my class and if she
didn’t you’d be in trouble tomorrow good
evening ladies and gentlemen I taught at
this school senior chemistry probably
for the last 12 years and before that in
the UK for many more years I’m
passionate about chemistry
I’ve taught it for so many years I’m
still enjoying it to this day as I was
saying the the thing about chemistry is
is obviously the best subject in any
school curriculum
it is fascinating it’s interesting and
it’s something I believe you need to
make them alive because students
obviously remember it better and if you
cannot a bit of fun while you’re
teaching something which is potentially
quite a challenging subject then it’s
obviously going to be a good thing so
basically what I thought I’d do tonight
is just show you feel the little
experiments that I do with my students
I’ll explain what I’m doing and if you
have any questions I’m more than happy
to answer them in the email that mr.
woozi sent it said something like
chemistry magic show I believe but at
the risk of disappointing you I’m afraid
there’s no magic here these are just
chemical reactions
I do accept to a physics teacher they
may seem like magic
sorry so without further adue pretty
like gas in that balloon there anyone
know what it is shut out you think
helium suggested good suggestion but not
correct hydrogen is the only other one
it could be there the two like gases I
do have some helium in this balloon here
but that is full of hydrogen how can you
tell them apart because they both are
very like they don’t kind of look any
differently there is a very simple way
helium is probably one of the most
boring things imaginable it’s an element
that there’s nothing at all it’s so
unreactive it really is very boring if I
was gonna do I’m gonna do that one in a
moment a helium you would be very
disappointed so there’s nothing much I
didn’t make my voice goes like that over
that thing okay on the other hand this
is hydrogen already not used to this so
no thank you no nice and boom nothing
spectacular but obviously a nice little
reaction nice playing ice fireball and
so on I’m gonna show you some various
reactions there’s no plan or anything
like that but just random experiments
and when I said earlier there’s no magic
in this well actually this next reaction
I think perhaps is as close to magic as
you could can become but to colorless
solutions here what I’m gonna do is
simply add one to the other and I think
when I do
you will be very impressed so let’s see
if you are here we go okay so I’ll be
impressed how about no magic now then
this is actually more physics in
chemistry what we have here is a water
container which has had the bottom
cutoff and a bit of plastic sheet put on
and that is because there’s a bungee
cord inside I can see you’re not
particularly impressed with what I just
shown you however it can become quite
because if you’ve got smoking it you can
these these things to use the physics
term are called toroidal vortices we
probably know them better as smoke rings
and basically the way they form all this
does is effectively push out a ball of
smoke but the ball is smoked as it goes
through the air basically it can you see
the the air basically kind of causes the
outside of the smoke ball to kind of
turn around and in on itself as it comes
obviously and resists it another is what
causes the smoker in the form so
probably as I say more physics in
chemistry but still see and I think okay
now that let me show you this reaction
here okay this reactions uses just got a
little bit of powder here when I teach
the chemistry of metals and we talk
about different metals having different
reactivities one of the things that I
show is a displacement reaction where a
more reactive metal can actually
displace a less reactive one from a
compound that’s a mixture of magnesium
and silver nitrate and magnesium is much
more reactive in silver nitrate but they
can’t react until they both solids and
to solids can’t get at each other
so effectively they can only react when
one of them is dissolved once the silver
nitrate so we need some water and we’ve
got some water we have the lights down
please for this I gotta try and hit that
okay I’m gonna show you that one again
you probably can’t see too much if you
just look at that one
but basically magnesium burns the pretty
bright white flame and if you
to be used in the olden days in flash
photography these days we use electronic
flashes obviously instead but it still
has using things like fireworks and
distress flares things like that okay
could be the lights done but not quite
as much as last that’s perfect
great thank you very much oh the reason
I’m showing this again is because
there’s a slight difference this time
I’ve added another chemical just a tiny
little bit of another chemical
I’m not chemical just happens to be heat
sensitive ready now we haven’t yeah okay
can you actually see me at all at the
moment cuz all I can see is a big green
blob and for in my eyes basically so
okay we’ve got same balloon as we
started with but this time I’ve added
something else to it and I got two more
here now they are all filled with
hydrogen but I’ve also put a couple of
chemicals in them same as firework
manufacturers do one of them has got a
lithium compound in one of them has got
a sodium component and one of those got
a barium compound in and they give reds
yellows and green colors to flames
fireworks use them all the time
so when the hydrogen flame goes this
time then we are gonna see hopefully a
better color as well okay let’s get our
light out I’m not quite sure which is
which because they all look exactly the
same but one should be red one yellow
and one green okay right let’s see which
ones first actually we run a bit short
so you know it speed things up a little
bit oh by the way when the hydrogen
burns like any flame it has to use
oxygen and that’s obviously in the air
around but effectively the hydrogen can
only burn when the oxygen outside allows
it to I’m just wondering all might
happen if we put the oxygen in the
balloon with it
anybody interested in that shall we
okay here we go this one has got oxygen
in as well and now we are ready for
action okay can I have the lights down
please for this one thank you very much
okay guys ready here we go
Oh – didn’t go hang on let’s get them to
close together
rather there we go try again
the last – oh and it still didn’t go
okay
well unfortunately they’re going on
their own but they’re going whether they
like it or not okay this one because
it’s got the oxygen already in it so you
should be okay out there worried about
[Applause]
thank you very much I hope you had the
fun I certainly did anyway [Applause]
introduction she has to say nice things
because she’s in my class and if she
didn’t you’d be in trouble tomorrow good
evening ladies and gentlemen I taught at
this school senior chemistry probably
for the last 12 years and before that in
the UK for many more years I’m
passionate about chemistry
I’ve taught it for so many years I’m
still enjoying it to this day as I was
saying the the thing about chemistry is
is obviously the best subject in any
school curriculum
it is fascinating it’s interesting and
it’s something I believe you need to
make them alive because students
obviously remember it better and if you
cannot a bit of fun while you’re
teaching something which is potentially
quite a challenging subject then it’s
obviously going to be a good thing so
basically what I thought I’d do tonight
is just show you feel the little
experiments that I do with my students
I’ll explain what I’m doing and if you
have any questions I’m more than happy
to answer them in the email that mr.
woozi sent it said something like
chemistry magic show I believe but at
the risk of disappointing you I’m afraid
there’s no magic here these are just
chemical reactions
I do accept to a physics teacher they
may seem like magic
sorry so without further adue pretty
like gas in that balloon there anyone
know what it is shut out you think
helium suggested good suggestion but not
correct hydrogen is the only other one
it could be there the two like gases I
do have some helium in this balloon here
but that is full of hydrogen how can you
tell them apart because they both are
very like they don’t kind of look any
differently there is a very simple way
helium is probably one of the most
boring things imaginable it’s an element
that there’s nothing at all it’s so
unreactive it really is very boring if I
was gonna do I’m gonna do that one in a
moment a helium you would be very
disappointed so there’s nothing much I
didn’t make my voice goes like that over
that thing okay on the other hand this
is hydrogen already not used to this so
no thank you no nice and boom nothing
spectacular but obviously a nice little
reaction nice playing ice fireball and
so on I’m gonna show you some various
reactions there’s no plan or anything
like that but just random experiments
and when I said earlier there’s no magic
in this well actually this next reaction
I think perhaps is as close to magic as
you could can become but to colorless
solutions here what I’m gonna do is
simply add one to the other and I think
when I do
you will be very impressed so let’s see
if you are here we go okay so I’ll be
impressed how about no magic now then
this is actually more physics in
chemistry what we have here is a water
container which has had the bottom
cutoff and a bit of plastic sheet put on
and that is because there’s a bungee
cord inside I can see you’re not
particularly impressed with what I just
shown you however it can become quite
because if you’ve got smoking it you can
these these things to use the physics
term are called toroidal vortices we
probably know them better as smoke rings
and basically the way they form all this
does is effectively push out a ball of
smoke but the ball is smoked as it goes
through the air basically it can you see
the the air basically kind of causes the
outside of the smoke ball to kind of
turn around and in on itself as it comes
obviously and resists it another is what
causes the smoker in the form so
probably as I say more physics in
chemistry but still see and I think okay
now that let me show you this reaction
here okay this reactions uses just got a
little bit of powder here when I teach
the chemistry of metals and we talk
about different metals having different
reactivities one of the things that I
show is a displacement reaction where a
more reactive metal can actually
displace a less reactive one from a
compound that’s a mixture of magnesium
and silver nitrate and magnesium is much
more reactive in silver nitrate but they
can’t react until they both solids and
to solids can’t get at each other
so effectively they can only react when
one of them is dissolved once the silver
nitrate so we need some water and we’ve
got some water we have the lights down
please for this I gotta try and hit that
okay I’m gonna show you that one again
you probably can’t see too much if you
just look at that one
but basically magnesium burns the pretty
bright white flame and if you
to be used in the olden days in flash
photography these days we use electronic
flashes obviously instead but it still
has using things like fireworks and
distress flares things like that okay
could be the lights done but not quite
as much as last that’s perfect
great thank you very much oh the reason
I’m showing this again is because
there’s a slight difference this time
I’ve added another chemical just a tiny
little bit of another chemical
I’m not chemical just happens to be heat
sensitive ready now we haven’t yeah okay
can you actually see me at all at the
moment cuz all I can see is a big green
blob and for in my eyes basically so
okay we’ve got same balloon as we
started with but this time I’ve added
something else to it and I got two more
here now they are all filled with
hydrogen but I’ve also put a couple of
chemicals in them same as firework
manufacturers do one of them has got a
lithium compound in one of them has got
a sodium component and one of those got
a barium compound in and they give reds
yellows and green colors to flames
fireworks use them all the time
so when the hydrogen flame goes this
time then we are gonna see hopefully a
better color as well okay let’s get our
light out I’m not quite sure which is
which because they all look exactly the
same but one should be red one yellow
and one green okay right let’s see which
ones first actually we run a bit short
so you know it speed things up a little
bit oh by the way when the hydrogen
burns like any flame it has to use
oxygen and that’s obviously in the air
around but effectively the hydrogen can
only burn when the oxygen outside allows
it to I’m just wondering all might
happen if we put the oxygen in the
balloon with it
anybody interested in that shall we
okay here we go this one has got oxygen
in as well and now we are ready for
action okay can I have the lights down
please for this one thank you very much
okay guys ready here we go
Oh – didn’t go hang on let’s get them to
close together
rather there we go try again
the last – oh and it still didn’t go
okay
well unfortunately they’re going on
their own but they’re going whether they
like it or not okay this one because
it’s got the oxygen already in it so you
should be okay out there worried about
[Applause]
thank you very much I hope you had the
fun I certainly did anyway [Applause]
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