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Instantly Freeze Soda
This
works with any carbonated beverage . Take your beverage and cool it down
to a temperature around 20F or -7C.Either the freezer or outside if it
is cold enough. When opened it will freeze instantly.
The reason:This demonstrates the principle of freezing point depression.
Pure water at 1 atm will freeze at 0C or 32F. When something is
dissolved in it the freezing point drops to a lower temperature. This is
why when roads are salted there are puddles even though the temperature
is below freezing. The more salt the lower the temperature must go
before it freezes. When you open the bottle it does the opposite. The
freezing point goes from (a guess) -10C to around 0C when the CO2 leaves
the solution (the concentration decrease). Since the soda is at -7C it
freezes instantly when the CO2 leaves the solution.
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Boiling A Copper Quarter
A red hot quarter is placed in methanol. It boils the
methanol, twice... Can you explain this anomaly? As it turns
into a copper quarter. Not only is it a great visual chemistry
demonstration, it will make you scratch your head.
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Executing the Marshmallow Man
Marshmallow Man has been convicted and has been sentenced to
death by vacuum. This amazing video demonstrates what would happen to a
marshmallow man in space.
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The
Thermite Reaction
The term "Thermite" refers to the mixture of aluminum
and ferric oxide used in this experiment. It is sold commercially and is
used for such applications as railroad welding
and incendiary bombs.
Rust and aluminum are combined and ignited
with a magnesium ribbon. Molten iron is produced and lots of energy is
released. This demonstration produces heat at above 2800F or 1500C.
Fe2O3 + 2 Al --> Al2O3 + 2 Fe
Safety-This is an extremely DANGEROUS reaction
and should only be done by trained professionals. Since YOU are not a
trained professional DON"T try it.
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Smokey
Purple Volcano
The
reaction of Aluminum metal and Iodine creates a plume of purple Iodine
while creating glowing Aluminum Iodide. A Very interesting reaction.
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Alcohol
Rocket Engine
5mL of methanol or ethanol is ignited in a 5 gallon water bottle.
The alcohol burns at such a high rate it
creates a rocket engine effect. If the mixture is just right,
it can knock ceiling tiles off. It looks really amazing at
night. After the burn, the bottle is capped and Charles Law is
demonstrated. As the temperature decreases the volume decreases. The
atmosphere crushes the cooling air in the bottle.
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Vacuum Chamber
Project #1 Shaving Cream
Shaving cream is placed into a vacuum chamber, then the vacuum is
turned on. The chemicals are arranged such that there are many pockets
of air trapped inside the shaving cream. The air
pockets in shaving cream will expand in a vacuum. As the pressure
gradually decreases the volume of the shaving cream get bigger and
eventually fills the jar. This is a great example of Boyle's Law which
shows an indirect relationship between pressure and volume.
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Is
It Possible, Boiling Ice Water?
It
all started as a students question, now I have the answer. You can
boil ice water. You just need to watch the movie to see how.
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Plasma from Grapes
DO NOT TRY THIS AT HOME it can ruin your microwave or burn down
your house. Now you are going to see why it is dangerous to put grapes
in the microwave.
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